RenewAire EV450 Premium Commercial Controls Instruction Manual

June 15, 2024
RenewAire

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RenewAire EV450 Premium Commercial Controls

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Product Information

Specifications:

  • Product: Premium Commercial Controls
  • Compatible Units: EV450, HE-Series, LE-Series, and RD-Series Units
  • Controller: Carel c.pCO Mini
  • Expansion Board: Carel c.pCOe Expansion Board
  • Controls Version: 3.xx.xx

Product Usage Instructions

1. Safety Precautions:

  • Before accessing the controller, disconnect all electric power supplies and verify with a voltmeter that electric power is OFF.
  • Wear protective equipment per NFPA 70E when working within the electric enclosure.
  • Install and open a remote disconnect switch to ensure there is no voltage inside the unit.
  • Follow all local codes and regulations.

2. Electric Wiring:

  • Whenever electrical wiring is connected, disconnected, or changed, the power supply to the ERV and its controls must be disconnected.
  • Lock and tag the disconnect switch or circuit breaker to prevent accidental reconnection of electric power.

3. Network Security:

  • The controller can be connected to a network, but it is susceptible to unauthorized access and hostile activities.
  • It is the owner’s responsibility to determine acceptable risks and safeguard the security of the controller and all connected devices.

4. Environmental Considerations:

  • The controller is only for use in protected environments and should not be exposed to weather or extremes in temperature.

5. Unit Efficiency:

  • Improper adjustment of unit setpoints may result in the ERV operating inefficiently.
  • Improper selection of Input Offsets may cause incorrect or inefficient operation of the ERV.

6. Access and Settings:

  • Only trained and authorized personnel should access the ERV control panel and the controller.
  • Changes to the controller settings should be made only by trained and authorized personnel.
  • All changes to the controller settings should be documented in the Controller Maintenance Records section of the manual.

7. Firmware and Manual Updates:

  • The control system is subject to periodic updates in firmware and the User Manual itself.
  • Contact RenewAire Support at RenewAireSupport@RenewAire.com to determine if you have the most recent manual and firmware.

FAQs

1. Can I use these controls with any type of ventilator unit?

No, these controls are specifically designed for use with EV450, HE-Series, LE-Series, and RD-Series Units.

2. What should I do if I need to make changes to the controller settings?

Only trained and authorized personnel should make changes to the controller settings. Document all changes in the Controller Maintenance Records section of the manual.

3. How can I ensure the security of the controller and connected devices?

It is the owner’s responsibility to determine acceptable risks and take necessary measures to safeguard the security of the controller and all connected devices.

4. Can I expose the controller to extreme temperatures?

No, the controller is not designed to be exposed to extremes in temperature. It should only be used in protected environments.

5. How can I stay updated with the latest firmware and manual?

Contact RenewAire Support at RenewAireSupport@RenewAire.com to determine if you have the most recent manual and firmware updates.

PREMIUM COMMERCIAL CONTROLS
Installation, Operation and Maintenance Manual
FOR EV450, HE-Series, LE-Series, and RD-Series Units

Carel c.pCO Mini

Carel c.pCOe Expansion Board

ERV Premium Commercial Controls This manual applies to energy recovery ventilator (ERV) units with Premium controls version 3.xx.xx. For previous versions refer to the older manual. The version number can be seen on the splash screen when the unit power is cycled. Newer units also have this version information in the Unit Status screens.
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Premium Commercial Controls ERV

WARNING
ARC FLASH AND ELECTRIC SHOCK HAZARD
Microprocessor controllers as discussed in this manual are typically installed in a control panel where high voltages are present. Whenever accessing any controller, disconnect all electric power supplies, verify with a voltmeter that electric power is OFF and wear protective equipment per NFPA 70E when working within the electric enclosure. Failure to comply can cause serious injury or death.
The line side of the disconnect switch contains live high-voltage.
The only way to ensure that there is NO voltage inside the unit is to install and open a remote disconnect switch and verify that power is off with a voltmeter. Refer to unit electrical schematic.
Follow all local codes.

CAUTION
RISK OF ELECTRIC SHOCK OR EQUIPMENT DAMAGE Whenever electrical wiring is connected, disconnected or changed, the power supply to the ERV and its controls must be disconnected. Lock and tag the disconnect switch or circuit breaker to prevent accidental reconnection of electric power.
CAUTION
RISK OF COMPUTER SECURITY BREACH This controller is capable of being connected to a network. Any device that is connected to a network is susceptible to unauthorized access and hostile activities. It is the owner’s responsibility to determine acceptable risks and to safeguard the security of the controller and all connected devices.

IMPORTANT
This controller is only for use in protected environments. It is not to be exposed to the weather or exposed to extremes in temperature.

IMPORTANT
Risk of degraded unit efficiency. Improper adjustment of unit setpoints may result in the ERV operating inefficiently. Improper selection of Input Offsets may cause incorrect or inefficient operation of the ERV.

IMPORTANT
Only persons who have been properly trained and authorized are to access the ERV control panel and the controller. Changes to the controller settings are to be made only by trained and authorized personnel. All changes to the controller settings are to be documented in the Controller Maintenance Records section in this manual.

IMPORTANT
This control system is subject to periodic updates in firmware and the User Manual itself. Please contact RenewAire Support at RenewAireSupport@RenewAire.com to determine if you have the most recent manual and firmware.

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OWNER INFORMATION ERV

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NOTE: This page is to be completed by the installing contractor. The completed document is to be turned over to the owner after start up.

READ AND SAVE THIS MANUAL/LIRE ET CONSERVER CE MANUEL

NOTICE

This manual contains space for maintaining written records of settings and changes. See Section 14, Maintenance Records. At the time the ERV is commissioned, a complete record (an operating parameter file) should be made of all settings, to include setpoints and offsets. Whenever changes are made to the controller data points, those changes should be recorded, along with the reason for the change.
Information that is recorded is specific to just one ERV or controller. If additional controllers are being documented, please make copies of these pages and identify each copy by its unit tag.

UNIT INFORMATION

Record information as shown below.
In the unlikely event that factory assistance is ever required, information located on the unit label will be needed.
Locate the RenewAire unit label found on the outside of the unit.
NOTE: This information is for purposes of identifying the unit-specific option data from the Configuration Code.

Configuration Code:
J

Serial Number:

SO #:
NOTE: When the ERV is first connected to electric power, the unit is to be started only for purposes of testing correct wiring and to verify correct operation of the fans and dampers.

UNIT INFORMATION

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UNIT LABEL (TYPICAL)
NOTICE
Whenever an operating parameter file is created in the controller internal memory, a backup file should be created on an external memory device and stored in some convenient place.

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OWNER INFORMATION ERV

CONFIGURATION CODE
Refer to Section 15, Reference in this manual for the full interpretation of the various configuration codes.

MODEL NUMBER

J

DIGIT NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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TABLE OF CONTENTS ERV

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OVERVIEW

1.1 CONTROL SEQUENCE OVERVIEW
The Renewaire ERV with premium controls provides outdoor air while saving energy by passing the Exhaust Air through the energy recovery core to exchange energy with the incoming air, with energy being passed to the incoming air in the winter and energy being passed to the outgoing air in the summer. Pairing this with the factory-programmed premium controller provides an excellent turn-key solution with the following control options.
1. Turning the unit off and on based on u A digital input (smoke detector, occupancy sensor, etc) u The controller keypad u Schedule u A BMS system, if the feature is enabled
2. Isolation damper control (if option is included)
3. Supply and exhaust fan control u On/Off fan control for constant speed fans u Variable speed fan control for variable speed and ECM fans (set as a percentage) u Variable speed fan control for variable speed fans as a CFM reading u Exhaust fan tracking u Fan control based on CO2 or VOC levels (with optional sensor added) u Fan control based on space or duct pressure levels (with optional sensor added) u Single fan operation with digital input or BMS command
4. Supply and Exhaust Fan status via current sensors
5. Monitoring of these values u Outdoor Air (OA) Temperature u Outdoor Air (OA) Relative Humidity u Return Air (RA) Temperature u Return Air (RA) Relative Humidity u Supply Temperature (SA) before tempering u Exhaust Temperature (EA) u Supply Air CFM u Exhaust Air CFM u User-supplied CO2 or VOC sensors u User-supplied Room or Duct Pressure sensors
6. Monitoring of pressure across filter for filter status
7. Bypass control (with external bypass option) for frost control/economizer control
8. Control for added heating (additional Conditioned Air Temperature sensor required) u 0­10V Gas or Electric u One- or two-stage Heat Pump u 10-0V Hot water valve control u Control based on Supply or Return Air u Setpoint can be reset off Outdoor Air temperature
9. Control for added cooling (additional Conditioned Air Temperature sensor required)
u 0­10V chiller water valve u One- or two-stage compressor/heat pump u Control based on Supply or Return Air
10. VRF Control Sequence
11. Dual Temp Coil (using BMS command for heat/cool signal)
12. Alarm alerts and logging

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OVERVIEW ERV

1.2 ENERGY RECOVERY BASICS
IMPORTANT
It is important to understand and use the equipment airstream terminology as it is used in this manual. The airstreams are defined as: u Outside Air (OA): Air taken from the external atmosphere and, therefore, not previously
circulated through the system. Each ERV unit has an OA air inlet. u Supply Air (SA): Air that is downstream of the enthalpic cores and is ready for conditioning. u Conditioned Air (CA): Air that is supplied to an occupied space. u Return Air (RA): Air that is returned to a heating or cooling appliance from a conditioned
space. When the ERV unit operates in recirculation mode, RA is conditioned and returned to the occupied space in the form of CA. Each ERV unit has an RA inlet. u Exhaust Air (EA): Air that is removed from a heating or cooling appliance and discharged. Each ERV unit has an EA outlet.
RenewAire energy recovery ventilators use static-plate, enthalpy-core heat exchangers that have no moving parts. u During summer months, the hot and humid OA passes by the cooler, drier RA, lowing its
temperature and humidity. u During winter months, the cold and dry OA passes by the warmer, moister RA, raising its
temperature and humidity.

EA

OA

CA

SA

RA

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OVERVIEW ERV

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NOTE: If an optional internal heating device is selected the CA duct sensor may need to be installed at least three duct diameters away from the ERV unit CA outlet.

1.3 TEMPERATURE SENSORS
There are four temperature sensors installed in each ERV. These are NTC sensors that have a Carel curve. The curve characteristics can be found in the Reference section. They are located at: u One at the inlet side of the EA Fan cone u One at the inlet side of the SA Fan cone u One at the entrance of the air intake to measure outdoor air (OA) temperature u One at the entering RA duct of the unit
If a unit has heating and/or cooling, there is also a fifth CA sensor that is required. It needs to be installed down the duct past the heating and cooling.

FIGURE 1.3.0 DUCT TEMPERATURE SENSOR
1.4 COMBINATION TEMPERATURE AND HUMIDITY SENSORS
Humidity transducers are mounted in the OA and RA compartments and provide an output from 0­10VDC that is proportional to 0­100% Relative Humidity.

FIGURE 1.4.0 TEMPERATURE AND HUMIDITY SENSOR

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1.5 SENSOR LOCATIONS

VFD AUTO/ MANUAL CONTROL

EA FAN

ERV CORE

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OVERVIEW ERV

FILTER PRESSURE SENSORS
MERV 13 FILTER (OPTIONAL)

NOTE: Not shown here are the Smoke Detector, CO2, IAQ, Duct Pressure Sensor, Room Temperature and Humidity Sensor, and Motion Detector. These items are all accessories and are field-installed.

SA FAN

EXPANSION MODULE

MICROPROCESSOR

EA FAN AND SA TEMPERATURE

FAN CURRENT

SENSORS

SWITCHES

(SA AND EA)

CORE AIRFLOW PRESSURE SENSORS

TEMPERATURE AND HUMIDITY SENSORS

FIGURE 1.5.0 SENSOR LOCATIONS IN ERV UNITS, HE2XINH SHOWN

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CONTROLLER OVERVIEW ERV

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CONTROLLER OVERVIEW

The control utilizes the Carel c.pco (pronounced see-pee-ko) controller with the c.pcoe expansion module.
34 7 10

1 2 3 65 4
1 Up Button 2 Enter Button 3 Down Button 4 Escape Button 5 Program Button 6 Alarm Button
FIGURE 2.0.0 C.PCO CONTROLLER BUTTONS

5

C.pCO n° (03)
75.5°F
Time 12:33
date: 07.06.2017
11
6
8 9

1

2

1 24VAC Power 2 Universal inputs/outputs 3 Power for RUT remote display
4 Remote display or BMS connection
5 Relay digital outputs 6 +5V power supply 7 FBUS connection to
expansion module 8 Analog outputs 9 Digital inputs 10 Ethernet port 11 Micro USB port

FIGURE 2.0.1 CONTROLLER EXTERNAL CONNECTIONS

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CONTROLLER OVERVIEW ERV

The c.pCOe expansion module has multiple digital and analog inputs and outputs, serving as an extension of the controller. The expansion board provides: u Heating and Cooling Control u Monitor Airflow Rates, Temperatures, and Pressures

5

4

Address Ext Baud Prot
3

NOTE: Expansion module DIP switches are factory set to address 5, No Offset, 19.2K, and Modbus. These settings should not be changed.

1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

ON OFF
Address

with offset no offset

19.2 K 9.6 K 38.4 K 57.6 K

CAREL Modbus

Ext. Baud Prot

1

2

1 24VAC Power 2 Universal inputs/outputs 3 Relay digital outputs 4 Serial connector to main controller 5 Dip switches
FIGURE 2.0.2 EXPANSION MODULE DETAIL

NOTE: Dip switch positions (Left to Right) are always set as follows:
Forward Backward Forward Backward
Forward Forward Forward Forward

ALARM BUTTON PROGRAM BUTTON
ESCAPE BUTTON

UP BUTTON ENTER BUTTON DOWN BUTTON

FIGURE 2.0.3 OPTIONAL REMOTE USER TERMINAL (RUT) BUTTON LOCATIONS

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CONTROLLER OVERVIEW ERV

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NOTE: When an alarm is first detected, the Alarm button will be flashing and an audible alarm will sound. After the alarm has been viewed, the light will remain on and the audible alarm will stop.

Pressing the PRG (program) button accesses the Service Menu or Login screen from any location in the user interface screens. The options that are available dynamically change depending on the configuration of the unit and the options installed on the unit.
The ESC button is used to go one level back from the screen the user is currently on. If the user is finished setting variables in a sub-menu, the ESC button takes them back to the previous menu. If the user is editing a variable and decides to not make a change, the ESC button takes them back to the top of that screen. Pressing the ESC button from the Main Menu takes the user back to the Main Status screen.
When on a screen with the cursor in the upper left-hand corner,the UP or DOWN hard buttons move the user from one screen to the next. While editing a variable, the UP or DOWN hard buttons allow the user to set the desired value of the variable. When viewing a view only variable, the UP or DOWN hard buttons scroll through the values available to the user.
When a menu or menu item has been highlighted, press the “ENTER” hard button to enter the highlighted selection. When a writable entry has been changed, press the hard button to enter the new value and then press it again to confirm the change.
Pressing the ALARM button displays any alarms that are currently active. There may be multiple screens of alarms. Pressing and holding the Alarm button for three seconds resets the alarms.

2.1 CONTROLLER ACCESS METHODS
The controller has a built-in display that can be used to set up the system and view the status of the system as well as address alarms. Two other options for accessing these are through the remote RUT and through the embedded web pages. All three methods use similar keys for the same purpose.

2.1.1 Using the Remote User Terminal (RUT)
The Remote User Terminal (RUT) allows you to plug into a controller and see the screens from that controller. RUTs are connected to the controller by means of a 10′ cable and then used as hand-held devices. They can alternately be installed on a wall in some convenient location. The push buttons on the face of the RUT have the same functions as the push buttons on the controller.

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FIGURE 2.1.0 OPTIONAL REMOTE USER TERMINAL (RUT)

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CONTROLLER OVERVIEW ERV

The RUT (optional accessory, field-installed) plugs into the controller by means of a six wire cable with RJ12 jacks on each end. The six-wire cable is inserted in the RJ12 jack on the back of the RUT and the other end of the cable is inserted into the RJ12 adapter, found in the low voltage electrical compartment. The controller uses a pre-configured cable that plugs into the J3 jack on the controller and the other end is plugged into the RJ12 adapter. The cable looks similar to a standard phone cable but has a different pin out. The cable from the controller to the low voltage electrical box is factory- installed.

BACK OF RUT

NOTE: Common telephone wiring is 4 conductor and uses RJ11 terminals. It is different from the six-wire cable with RJ12 terminals needed for this accessory.

LOW VOLTAGE ELECTRICAL COMPARTMENT

NOTE: If the controller was ordered for use with a serial BMS and an RUT is also desired, contact the factory for further information.

FIGURE 2.1.1 CONNECTING A RUT
2.1.2 Connecting Using Internal Web Pages
The controller has embedded web pages and when they are accessed, an interactive screen appears that allows the user to move through all the controller menus. The IP address of the controller is factory-set at 10.10.1.2. The subnet address (needed for setting up a LAN) is set at 255.255.255.0. These can be changed in the General Settings menu.
In order to connect to the controller with your pc you will need: u An ethernet cable between the PC and the controller u The PC connection must be on the same subnet as the controller. For example, if using the
defaults, you would set the IP address of the PC connection to 10.10.1.xx where xx is not equal to 2, and the subnet to 255.255.255.0. (See directions for setting the PC IP address if you are not familiar with this.)

NOTE: For direct connection from RUT to J3 Terminal, use the following wiring: Green & Black = +Vterm Brown & Blue = GND Red = Negative (-) White = Positive (+)
NOTE: The controller will only support private IP addresses which start with 192, 172, or 10.

u Using a browser such as Chrome, put the controller IP address into the address bar.

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CONTROLLER OVERVIEW ERV

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You should see this web page. To get to the menu screens, click on RUT on the Menu Bar.

2.1.3 Setting the PC IP Address For those that are not familiar with changing their PC adapter settings, go into Network Setting in the Control Panel and Change Adapter Settings.
Choose the adapter you are using to connect to the controller.
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CONTROLLER OVERVIEW ERV

Select Internet Protocol 4 and click on Properties.

NOTE: When you are finished viewing the controller on your computer, remember to restore the original settings.

Enter the IP address you want to use. It should not be identical to the controller IP address. The last octet of the IP address should be different. Click OK.
2.1.4 Using the Multikey Function of the Web Pages When you want to press multiple keys or press a key longer for a function you can use the keys below the Menu Screens to do this.
Two common uses are: u Set the two keys to Alarm and Alarm and press Simulate long press to acknowledge alarms. u Set the two keys to Alarm and Enter and press Simulate long press to get to system menus.
2.2 CONTROLLER MENU STRUCTURE
Any screen will have the name of the menu to which it belongs on the top line of the screen.
2.2.1 User Menu Structure The user menu can be reached but pressing the ESC (back) button. The menus contain the following areas: u Unit Status–Contains the status values of the sensors, fans, and heating and cooling,
if applicable u Control Settings–Contains the control settings for the fans and heating and cooling,
if applicable u General Settings–Contains the clock settings, Unit of Measures, IP Address, BMS settings,
and the scheduler u Alarm Settings–Contains the alarm settings u Unit On/Off–Allows the user to turn the unit on and off via the keypad
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GENERAL FLOW ERV

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2.2.2 Password Protected Menu Structure
The password protected menu can be reached but pressing the PROG button and entering the password. The menus contain the following areas: u Back Up and Restore–Contains the screens to back up your settings or return to
factory defaults u Unit Configuration–Main Unit Configuration Settings that determine which screens show up
in other areas u I/O Configuration–Secondary configuration settings for functions u I/O Calibration–Allows sensors to be adjusted for accuracy u Sensor Overrides–Allows a sensor value to be temporarily overwritten for testing u Test End Devices–Allows outputs to be manually manipulated for troubleshooting u Advanced Service–Advanced Service Information and Settings

2.2.3 Password Entry
To access the password protected service screens, press the program (bullseye) button to get to the screen and enter the user password “1000.”

GENERAL FLOW FOR SETUP AND RUNNING UNIT

Depending upon features selected for the unit, the general flow for setup and running the unit is as follows:

GENERAL SETTING: CLOCK, UNIT OF MEASURE, IP
ADDRESS, SCHEDULE

UNIT CONFIGURATION: ENABLE HEAT AND/OR COOL, FAN
TYPE, DEFROST…

I/O CONFIGURATION: ENABLE EXTRA SENSOR AND
SPECIAL FEATURES

FAN CONFIGURATION: SET SUPPLY AND EXHAUST FAN
CONTROL TYPES

START UNIT: PROVE FAN RUNNING

TEST HEATING:

TEST COOLING:

CHOOSE HEAT TYPE AND TEST CHOOSE COOLING TYPE AND TEST

TEST ECONOMIZER: CHOOSE TYPE AND TEST

TEST FROST CONTROL: SET CONTROL AND TEST

TEST SINGLE FAN MODE: IF DESIRED

BMS INTEGRATION: CHOOSE TYPE AND TEST

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UNIT CONFIGURATION ERV

UNIT CONFIGURATION

4.1 CONFIGURE GENERAL SETTING
There are several general settings that are need for correct operation of the controller.
4.1.1 Setting the Time and Date It is important to have the correct time and date for alarm time stamps and logging. u Set Refresh to YES, It will turn back to NO after changing the display to the current controller
time and date. u Change the Time ad Date accordingly. (Day is automatically generated.)

4.1.2 Setting the Unit of Measure
The controller supports the following settings: u SI (bar, Celsius) u USA (psi, Fahrenheit) u UK (bar, Celsius) u CAN (psi, Celsius)
Set the Unit of Measure to the desired units for the display.

4.1.3 Setting the IP Address of the Controller
The controller IP address may be used for the BMS, networking, or local access.
u Set the DHCP to OFF if using a static IP u Set the IP address and Mask u Set Update to YES u Cycle power to the controller

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UNIT CONFIGURATION ERV

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4.1.4 Scheduler
Enable the scheduler, if desired. If you enable the scheduler, it will have to be set for “ON” for the unit to run along with all other “ON” conditions.
u Enable the scheduler by setting to YES. u Set the schedule for each day. You can use the copy feature to copy days. Save data
after each. u Set vacation periods. u Set Special Days.

4.2 VERIFY UNIT CONFIGURATION
4.2.1 Main Unit Configuration It is important to verify the configuration as the settings on these screens will also determine which screens show up in the user settings screens. u Unit Type is Premium or Premium RD (for RD units). u Choose whether an EV450 unit (one fan motor). u Will you be adding an external bypass? u Was the unit ordered with isolation dampers? u Will you be controlling heat? u Will you be controlling cooling? (Must be set for Premium RD). u If bypass is added, will you have frost protection? u Are the supply and exhaust fans variable speed (VFD or ECM)?
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UNIT CONFIGURATION ERV

NOTE: If you choose EV450 you will only see information for the supply fan as both fans are run from one motor.

4.2.2 I/O Configuration
If using CO2, VOC, Room Static Pressure or Duct Static Pressure to control the fans, enable the sensors here and adjust the scaling if needed. These are user supplied sensors.
If either heating or cooling was enabled, the unit also requires a CA Temperature sensor in the discharge air duct. This may be included with RD units if heating or cooling was ordered with the unit but will have to be placed in the duct. The sensor may also be included with heating units purchased from RenewAire.

4.2.3 Field-Installed Sensors and General Wiring
All sensors are wired to an intermediate terminal, as shown. The factory wiring connects to the controller itself. It is shown for troubleshooting purposes but should not be changed.

FACTORY WIRING
21 22 23 24 25 26 27 28 29 30

FIELD WIRING
SENSOR 24VAC CO2 LEVEL VOC LEVEL SPACE PRESSURE DUCT PRESSURE CA TEMPERATURE SENSOR COMMON

FIGURE 4.2.0 X3 TERMINALS

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UNIT CONFIGURATION ERV

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Field-installed control sensors and monitors are to be installed and wired in accordance with instructions shipped in the documentation package. Wire gauge must be in accordance with the following:

Wire Gauge

22

20

18

16

14

12

Circuit Length 100′ 150′ 250′ 400′ 700′ 1000′

4.2.4 CO2/VOC Sensors
The ERV control allows the use of a CO2 sensor and/or a VOC sensor. The sensor may be physically attached to the system (Source = Hardware) or the value may be written from the BMS system (Source = from BMS).
The CO2 sensor is used as part of a demand control ventilation system to provide speed control of fans based on the level of CO2 in the space or duct. These sensors provide a 0­10VDC signal scaled as specified in the CO2 scaling screen.

FIGURE 4.2.1 CO2 SENSOR (DUCT MOUNT, SIDE VIEW)

FIGURE 4.2.2 CO2 SENSOR (WALL MOUNT)

The Air Quality Monitor detects total VOCs (TVOC) in the supply airstream or the space. It uses a MEMs metal oxide semiconductor sensor to capture VOC emissions that are invisible to CO2 sensors. It is installed in the SA duct or the space. These sensors provide a 0­10VDC signal scaled as specified in the VOC scaling screen.

NOTE: When wiring sensor, do not wire directly to the expansion module; wire to the X3 terminal block, see Figure 4.2.0.
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CO2-W OR CO2-D SENSOR P/N 131304 OR 131305

EXPANSION MODULE

X3-22

X3-27 X3-21

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UNIT CONFIGURATION ERV

IAQ-W OR IAQ-D SENSOR P/N 131308 OR 131307

EXPANSION MODULE

X3-23

X3-27

NOTE: When wiring sensor, do not wire directly to the expansion module; wire to the X3 terminal block, see Figure 4.2.0.

X3-21
4.2.5 Differential Pressure Duct or Room Pressure Sensor The pressure transmitter with a display screen (below right) is an optional accessory and would be installed in a duct to run the fan to meet a specific duct pressure. These sensors provide a 0­10VDC signal scaled as specified in the Duct Pressure scaling screen.

FIGURE 4.2.3 PRESSURE DIFFERENTIAL TRANSMITTER (TYP)

FIGURE 4.2.4 ELECTRICAL PRESSURE DIFFERENTIAL TRANSMITTER

EXPANSION MODULE

X3-27 X3-21

X3-25

DUCT PRESSURE SENSOR P/N 131309

NOTE: When wiring sensor, do not wire directly to the expansion module; wire to the X3 terminal block, see Figure 4.2.0.
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UNIT CONFIGURATION ERV

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NOTE: When wiring sensor, do not wire directly to the expansion module; wire to the X3 terminal block, see Figure 4.2.0.

DUCT PRESSURE SENSOR P/N 131315

X3-21

EXPANSION MODULE

X3-25

X3-27

SPACE PRESSURE SENSOR P/N 131314

EXPANSION MODULE

X3-24

X3-27

NOTE: When wiring sensor, do not wire directly to the expansion module; wire to the X3 terminal block, see Figure 4.2.0.

X3-21
4.2.6 CA Temperature Sensor
The CA Temperature sensor is automatically enabled if the heating and/or cooling is enabled. If it is not connected, an alarm will occur. If your unit was ordered with heating and/or cooling, the supply temperature sensor should be included but may need to be installed down the duct to prevent cycling of heating or cooling. The sensor uses a special curve and cannot be swapped with standard T2 or T3 NTC sensors.
EXPANSION MODULE

CA TEMPERATURE SENSOR P/N 131318

X3-27

X3-26

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UNIT OPERATION ERV

5.0 UNIT OPERATION AND FAN CONTROL
The primary purpose of the ERV unit is to provide 100% OA. The amount of air that it provides is based on the configuration of the supply and exhaust fans and whether the unit is running or not.
Fans are either controlled with variable speed drives or ECM motors.
5.1 SEQUENCE OF OPERATION FOR UNIT START
The unit will start when all of the following conditions are true: u There are no serious alarms. u The Digital Input for start/stop (terminals 17 and 18) are closed. u The unit is turned on at the keypad. u The time is within the scheduler “ON” time, if scheduler enabled. u The BMS has written the unit on signal, if BMS control is enabled.

Upon starting, the isolation dampers will open. The end switches of these dampers will complete the Fan Enable signal to the ECM or VFD fans.
Once the fan enable signal is complete, the fan command signal will be sent to the fan after the start up delay time. Each fan is paired with a current sensor. If within the alarm delay time, default 90s, the current sensor does not detect the fan running, the unit will shut down and an alarm will occur.
The setting SF Alarm Unit Run? setting tells whether the unit, and thus the exhaust fan, will continue to run if there is an alarm with the supply fan.

The Unit status is shown on the bottom of this screen. More than one of these statuses may be valid at one time
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STATUS SHOWN Unit on Off by alarm Off by BMS Off by Time Band Off by Schedule Off by Keypad EF Only Mode SF Only Mode BMS Cool Lockout BMS Heat Lockout In Device Test Input Overwritten Off by CO2 Level Flush Mode Frost Control on

UNIT STATUS CONDITIONS
MEANING The unit is on and running. The unit is off by a serious alarm. The unit is off by command from the BMS. The unit is off by the scheduler. The unit is off by the ID1 digital input. The unit is off by the setting on the local interface. The unit is in single fan mode with exhaust fan running. The unit is in single fan mode with supply fan running. The unit is in HEAT mode from the BMS. The unit is in COOL mode from the BMS. The system is in device test mode. There is a sensor input that is overwritten. The CO2 level is below the limit for running. The unit is running in FLUSH mode. The unit is running in Frost Control Mode.

5.1.1. Digital Input (ID1) Unit On/Off
The digital input across terminals 17 and 18 must be closed to turn the unit on. It can be jumpered if not used. Some of the uses are a remote switch, a smoke detector or a motion/ occupancy sensor. The unit can also be supplied with an optional drain overflow switch that is wired into this input. Shown are the accessories are offered by RenewAire.

5.1.1.1 Optional Smoke Detector Normally field-installed on the discharge duct, near the furnace.

FIGURE 5.1.0 SMOKE DETECTOR
5.1.1.2 Optional Motion Sensor Used for occupancy-based ventilation, hardwired to the low-voltage terminal strip.

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FIGURE 5.1.1 MOTION SENSOR (CEILING MOUNT)

FIGURE 5.1.2 MOTION SENSOR (WALL MOUNT)

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5.1.1.3 Optional Drain Overflow Switch
This is an optional accessory, ordered with the unit and factory-installed. The overflow switch monitors condensate levels in the condensate pan and if unacceptable levels are detected, it will cause the fans to switch OFF and the dampers will return to their Normally Closed positions. When the condensate level drops, the unit will return to normal operation.

FIGURE 5.1.3 OVERFLOW SWITCH
5.1.2 Optional Dampers The ERV unit has optional isolation dampers with end switches. For more information consult the unit specific IOM.
5.1.3 Fans The variable speed fans may be driven by VFDs or may be ECM fans. The VFD fans get an enable signal and both types of fans get a 0­10VDC signal which is proportional to 0­100% fan command. Factory VFD settings should not be changed. The settings are available in the Reference section of this manual.
5.1.4 Airflow Measurement Two pressure transmitters that measure up to 20″ w.g. are installed at the fan inlet cones and are used to measure pressure drop across the fan inlet rings. The scaling screen can be found in the I/O Configuration. The kfactor is factory set for the fans and should only be adjusted during test and balance. The supply and exhaust flow values can be read in the Unit Status screens.

FIGURE 5.1.4 PRESSURE DIFFERENTIAL TRANSMITTER (TYP)

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NOTE: Current sensors are calibrated for reduced fan speed at time of shipment from the factory. Immediately after entering new operating parameters for the fans (done during the start up process), current sensors are to be re- calibrated for minimum current draw. The fan should be running at its minimum speed.

5.1.5 Current Sensors Current sensors are installed on high voltage supply wires to sense current going to a fan motor. They are used to prove the ON/OFF state of fan motors.
FIGURE 5.1.5 CURRENT SWITCH
When the unit starts, this screen will show when the fans are enabled. There is a slight delay of a few seconds, and then the second line, supply (or exhaust) fan on shows the status of the current sensor.

The current sensors are factory adjusted and may need to be field-adjusted for the application. This will be evidenced by getting a supply fan alarm (AL10) or exhaust fan alarm (AL11). The instructions are in the Alarms and Troubleshooting section of this manual.
5.1.6 Filter Monitoring There is a pressure transducer across the filters on the outdoor air and RA streams to monitor the filter status. The scaling is factory set in this screen.

The alarm level can be set pressure can be set such that if the pressure reaches the alarm level, the unit will alarm but keep running.

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You can also see the pressure in this screen so that if it gets close to the alarm level you can change it at your convenience.

5.2 OPTIONS FOR SUPPLY FAN CONTROL
Units with a VFD or ECM for the supply fan can control the fan for constant speed, SA flow control, supply duct static pressure control, room static pressure control, CO2 control, VOC control, or CO2 Flow control. Available modes may depend on the sensors added.
5.2.1 Constant Fan Speed Option The analog voltage command to the supply fan VFD or ECM can be set from the unit controller display or by the BMS. The adjustable range of 0% to 100% correspond to the minimum and maximum fan operating speed.

NOTE: It is possible to have the BMS control the fan directly. Refer to the BMS section for more information.

This supply fan operation mode can be used to field balance the SA flow rate.

5.2.2 SA Flow Control Option
The controller will adjust the supply fan VFD or ECM command to maintain the SA flow rate at a setpoint.

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The SA flow rate setpoint is entered and adjusted from the unit controller display or provided by the BMS. The minimum and maximum values for SA flow rate setpoint are unit dependent. An adjustable proportional and integral (PI) loop will compare the measured SA flow to the airflow rate setpoint and adjust the fan speed. If the measured SA flow rate varies from the desired airflow rate by more than 10% (adjustable) for more than 60 seconds (adjustable) a SA flow rate alarm will be set to true. This supply fan operation mode can be used to provide a constant SA flow rate as the unit filters become loaded.

5.2.3 Supply Duct Static Pressure Control Option
The controller will adjust the supply fan VFD or ECM command to maintain the supply duct static pressure at a setpoint. This option requires a field- installed duct pressure transmitter and setup for the transmitter in the I/O configuration.

The SA duct static pressure setpoint is entered and adjusted from the unit controller display or provided by the BMS. The minimum and maximum values for SA duct static pressure setpoint are unit dependent. An adjustable PI loop will compare the measured SA duct static pressure to the static pressure setpoint and adjust the fan speed. If the measured static pressure varies from the desired static pressure by more than 0.05″ w.g. (adjustable) for more than 60 seconds (adjustable) a SA static pressure alarm will be set to true. This supply fan operation mode can be used to provide a constant supply duct pressure for VAV systems.

5.2.4 Room Static Pressure Control Option
The controller will adjust the supply fan VFD or ECM command to maintain the room static pressure at a setpoint. This option requires a field-installed room pressure transmitter and setup for the transmitter in the I/O configuration.

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The room static pressure setpoint is entered and adjusted from the unit controller display. The minimum and maximum values for room static pressure setpoint are unit dependent. An adjustable PI (proportional & integral) loop will compare the measured room static pressure to the static pressure setpoint and adjust the fan speed. If the measured static pressure varies from the desired static pressure by more than 0.05″ w.g. (adjustable) for more than 60 seconds (adjustable) a room static pressure alarm will be set to true. This supply fan operation mode can be used to provide a constant static pressure in an area to control infiltration or exfiltration from an adjacent area or outdoors.

5.2.5 CO2/VOC Control Option
The controller will adjust the supply fan VFD or ECM command to maintain the room or RA CO2 or VOC level at a setpoint. This option requires a field- installed CO2 and/or VOC sensor or value from a BMS and setup for the sensor in the I/O configuration.

The CO2/VOC setpoint is entered and adjusted from the unit controller display or provided by the BMS. An adjustable PI loop will compare the measured CO2/VOC level to the CO2/ VOC setpoint and adjust the fan speed. The minimum and maximum fan speed commands are adjustable. If the measured CO2/VOC level exceeds 1000 ppm (adjustable) for more than 60 seconds (adjustable) a CO2/VOC alarm will be set to true. This supply fan operation mode can be used to provide demand-controlled ventilation of a space. The minimum fan speed will provide the required minimum outdoor air when the CO2/VOC level is at or below the CO2/VOC setpoint.

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5.2.6 CO2 Flow Control Option
The controller will adjust the supply fan VFD or ECM command based on the measured room or RA CO2 level.

NOTE: It is possible to have the BMS control the fan directly. Refer to the BMS section for more information.

The SA flow setpoint is derived from the user entered minimum and maximum CO2 levels and minimum and maximum desired airflow rates. When the CO2 level is at or below the minimum CO2 level the airflow setpoint is at the minimum and when the CO2 level is at or above the maximum CO2 level the airflow setpoint is at the maximum. Between the minimum and maximum CO2 levels the airflow setpoint is linearly scaled. If the measured CO2 level exceeds 1000 ppm (adjustable) for more than 60 seconds (adjustable) a CO2 alarm will be set to true. This supply fan operation mode can be used to provide demand-controlled ventilation of a space. The minimum fan speed will provide the required minimum outdoor air when the CO2 level is at or below the CO2 setpoint.
OA CFM SETPOINT 1400 1200 1000
800 600 400 200
0 0 200 400 600 800 1000 1200
5.3 OPTIONS FOR EXHAUST FAN CONTROL
Units with a VFD or ECM for the exhaust fan can control the fan for fixed speed, EA flow control, supply fan command tracking control, supply fan flow rate tracking control, or room static pressure control.
5.3.1 Constant Fan Speed Option
The analog voltage command to the exhaust fan VFD or ECM can be set from the unit controller display or by the BMS.

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The adjustable range of 0% to 100% correspond to the minimum and maximum fan operating speed. This exhaust fan operation mode can be used to field balance the EA flow rate.

5.3.2 EA Flow Control Option The controller will adjust the supply fan VFD or ECM command to maintain the EA flow rate at a setpoint.
The EA flow rate setpoint is entered and adjusted from the unit controller display or provided by the BMS. The minimum and maximum values for EA flow rate setpoint are unit dependent. An adjustable PI loop will compare the measured EA flow to the airflow rate setpoint and adjust the fan speed. If the measured EA flow rate varies from the desired airflow rate by more than 10% (adjustable) for more than 60 seconds (adjustable) an EA flow rate alarm will be set to true. This exhaust fan operation mode can be used to provide a constant EA flow rate as the unit filters become loaded.

5.3.3 Supply Fan Command Tracking Control Option
The controller will adjust the exhaust fan VFD or ECM command to track the supply fan VFD or ECM command.

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The minimum (50%) and maximum (200%) tracking rates are adjustable. This exhaust fan operation mode can be used to maintain proportional supply and exhaust fan commands as the supply fan modulates.

5.3.4 Supply Fan Flow Tracking Control Option
The controller will adjust the exhaust fan VFD or ECM command to track the supply fan air flow rate.

The offset from the SA flow rate is adjustable from -25% to +25%. An adjustable PI loop will compare the measured EA flow to the airflow rate setpoint and adjust the fan speed. This exhaust fan operation mode can be used to maintain proportional supply and EA flows as the supply fan modulates and as the unit filters become loaded.

5.3.5 Room Static Pressure Control Option
The controller will adjust the exhaust fan VFD or ECM command to maintain the room duct static pressure at a setpoint.

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The room static pressure setpoint is entered and adjusted from the unit controller display or provided by the BMS. The minimum and maximum values for the room static pressure setpoint are unit dependent. An adjustable PI loop will compare the measured room static pressure to the static pressure setpoint and adjust the exhaust fan speed. If the measured static pressure varies from the desired static pressure by more than 0.05 inches water gauge (adjustable) for more than 300 seconds (adjustable) a room static pressure alarm will be set to true. This exhaust fan operation mode can be used to provide a constant room pressure for variable exhaust systems

TEMPERING CONTROL

The secondary purpose of the ERV unit is to provide 100% outdoor air that tempered.
6.1 MODES OF OPERATION
There are three modes of operation (if applicable): u Heating Mode–Will run the heating to maintain a heating setpoint u Sensible Cooling Mode–Will run the cooling to maintain a cooling setpoint u Ventilation Mode–Will only run the fans for ventilation
See the following sections for more information on these modes. The mode is determined in this order:
1. Heating: Is the unit configured for heating? Is the outdoor air temperature lower than the heating lockout temperature?
2. Cooling: Is the unit configured for cooling? Is the outdoor air temperature higher than the cooling lockout temperature?
3. If it in no other mode and the unit is on, it will be in Ventilation Mode.
In normal heating operation, the controller will prevent the heater from running when the Outdoor Air temperature is above the Lockout Above setpoint. This causes the ERV unit to use energy recovery from the RA for heating instead of firing the heat module. The Lockout Above setpoint is assigned by the user, based on both ambient temperatures and experience with the building being heated. RenewAire suggests an initial Lockout Above setting of 50°F. If the OA air is at 50°F and the EA coming from the Occupied Space is at 72°F, the CA recovers enough heat energy from the EA that it will reach about 67.6°F without any supplementary heat from the heat module when the heat exchange core is at maximum efficiency. In every building, there is additional heat being generated by human activity, equipment and thermal gain from sunlight, etc. If there is very little additional heat being generated in the Occupied Space, the Lockout Above setting may have to be raised. If there is a great deal of heat being generated, the Lockout Above setting can actually be lowered further.
The Lockout Above function has a hysteresis band built into it to prevent short-cycling when the OA air is near the Lockout Above setpoint. In other words, if the Lockout Above setpoint is at 50°F, the gas heat module will be disabled whenever the OA air temperature is higher than 50°F. When the OA air temperature drops to 50°F, the controller will continue to lockout the heat module until the OA temperature drops an additional 1.8°F, the hysteresis band.
Lockout Below performs the same function as Lockout Above, but for cooling. The factory setpoint for Lockout Below is 70°F, meaning that if the Outdoor Air temperature is lower than 70°F, the cooling unit will be blocked from running. RenewAire suggests an initial Lockout Below setting of 70°F.

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6.2 HEATING
The heating requires that heating be enabled in the Unit Configuration. The heating type is set in the Control Settings.

6.2.1 Heating Mode
For any type of heating there is an outdoor air lockout temperature above which heating will not be allowed. Note that the default is low. This is to insure that at start up, you can start your fans without worrying if the tempering will also start. This value will need to be raised to an acceptable value.

6.2.2 Setpoint Type and Control Type
For each type of heating, you can choose a setpoint type and a control type. Setpoint types available: u Adjust: If you choose this it will allow you to set a heating setpoint. u OA Reset: You are prompted to set a reset schedule. In the screen shown, the setpoint will
be 70°F if the outdoor air is 0°F or below, and 60°F if the outdoor air is 50°F and above. It will be linear between. For example, if the outdoor air is 25°F, the setpoint will be 65°F. This method is useful to avoid overheating the space or to avoid excess cycling in warmer temperatures.
Control types available: u CA: Be sure to install your CA temperature sensor far enough down the duct
to prevent over-cycling. u RA: If you are only feeding one space this is a useful control method. RA is
always used for unoccupied operation. RA should also be used when a staged heat source is utilized.

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6.2.3 Heating Types
The following heating types are supported: u 0­10VDC: Gas u 0­10VDC: Electric u 10­0VDC: Hot Water Valve u Single Stage Heater u Two-Stage Heater u HP 1 Stage: with or without 0­10VDC aux heat–See Combined Tempering u HP 2 Stage: with or without 0­10VDC aux heat–See Combined Tempering u Dual Temp Coil: A coil that is used for both hot and cold water, depending upon season–
See Combined Tempering u VRF–See Combined Tempering
The heating type is set at the top of this screen.

6.2.3.1 0­10VDC Gas or Electric Heating The mode is determined by the outdoor temperature and the heating lockout temperature settings.
This type of heating will modulate gas or electric heat using PI control. The KP and Ti can be adjusted to fine tune the control. The setpoint is also set here if set for Adjust. The NO1 heating enable contact is engaged whenever the heating output is at 1% or higher. A unit-specific electrical schematic is found inside the access door to the core module.

The heating status can be monitored in the Unit Status. The screen shows: u Heating Control Variable which will be as selected if in occupied operation u Heating setpoint which will be:
u Heating setpoint if selected adjust u Calculated OA reset heating setpoint if selected OA reset u Whether heating enable 1 is ON u Command (0­100%) to Heater, where 0 = 0VDC output and 100% = 10VDC output u Heating Status

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The heating status values are shown. Multiple values may be true.

MESSAGE Heat Locked Out by OA Unit OFF

MEANING The heating outdoor air lockout is higher than the OA temperature. Unit is off.

6.2.3.2 10­0VDC Hot Water Valve
The mode is determined by the outdoor temperature and the heating lockout temperature settings.

NOTE: The valve control can be set directly from the BMS if you change Valve control to BMS. In this case all Heating Control settings from the controller will be ignored.

The hot water valve control is 10VDC for closed and 0VDC for open so that it fails open. This type of heating will modulate using PI control. The KP and Ti can be adjusted to fine tune the control. The setpoint is also set here if set for Adjust. The NO1 heating enable contact is engaged whenever the heating output is at 99% or lower.

The heating status can be monitored in the Unit Status. The screen shows: u Heating Control Variable which will be as selected if in occupied operation u Heating setpoint which will be:
u Heating setpoint if selected adjust u Calculated OA reset heating setpoint if selected OA reset u Whether heating enable 1 is ON u Command (0­100%) to Heater, where 0 = 10VDC output and 100% = 0VDC. u Heating Status

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The heating status values are shown. Multiple values may be true.

MESSAGE Heat Locked Out by OA Unit OFF

MEANING The heating OA lockout is higher than the OA temperature. Unit is off.

6.2.3.3 Single Stage Heater
The mode is determined by the outdoor temperature and the heating lockout temperature settings.

This type of heating cycles one stage of heating to maintain the heating setpoint. You must set a hysteresis value whereby the stage will turn on at the setpoint + hysteresis and turn at setpoint.
The “Use Cool Outs” setting should be set to no for heater mode, where the output used for this control will be the heating output NO1 on the expansion module.

ON

Decreasing temperature turns

mode ON at setpoint + hysteresis

Increasing temperature
OFF turns mode OFF at setpoint

Hysteresis

Setpoint – Hysteresis

Heat Setpoint

TEMPERATURE

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The heating status can be monitored in the Unit Status. The screen shows: u Heating Control Variable which will be as selected if in occupied operation u Heating setpoint which will be:
u Heating setpoint if selected adjust u Calculated OA reset heating setpoint if selected OA reset u Whether heating enable 1 is ON u Heating Status

The heating status values are shown. Multiple values may be true.

MESSAGE Heat Locked Out by OA Unit OFF

MEANING The heating OA lockout is higher than the OA temperature. Unit is off.

6.2.3.4 Two-Stage Heater
The mode is determined by the outdoor temperature and the heating lockout temperature settings.

This type of heating cycles two stages of heating to maintain the heating setpoint. You must set a prop band value. This value represents 100%; the wider the prop band the slower the response. Then you specify the “on point” for stages one and two in percentages. Stage one will turn off at setpoint and stage two will turn off at the on point for stage one. There is also a minimum on and off time to prevent over-cycling.
The “Use Cool Outs” setting should be set to no for heater mode, where the output used for this control will be the heating output NO1 on the expansion module.

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100% 75%
STAGE 2 ON

25%

0%

STAGE 1 ON

Stage 1 turns on a 25% and Stage 2 at 75% of prop band

STAGE 2 OFF

Stage 2 turns off at 25% and Stage 1 at 0% of prop band
STAGE 1 OFF

Setpoint Proportional Band

Proportional Band

Setpoint

TEMPERATURE

Example: In this case 4°F = 100% which means that 1°F = 25%, which makes our calculation easy. With the default settings, stage 1 turns on at 75.2 – 1 = 74.2. Stage 2 turns on at 75.2 – 3 = 72.2.
The heating status can be monitored in the Unit Status. The screen shows: u Heating Control Variable which will be as selected if in occupied operation u Heating setpoint which will be:
u Heating setpoint if selected adjust u Calculated OA reset heating setpoint if selected OA reset u Whether heating enable 1 is ON u Heating Status

The heating status values are shown. Multiple values may be true.

MESSAGE Heat Locked Out by OA Unit OFF

MEANING The heating OA lockout is higher than the OA temperature. Unit is off.

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6.3 COOLING
The cooling requires that cooling be enabled in the Unit Configuration. The cooling type is set in the Control Settings. The unit should also be set to PremiumRD, as shown at the top of the screen.

6.3.1 Cooling Mode
For any type of cooling there is an outdoor air lockout temperature below which cooling will not be allowed. Note that the default is high. This is to insure that at start up, you can start your fans without worrying if the tempering will also start. This value will need to be lowered to an acceptable value.

6.3.2 Cooling Control Type
For each type of cooling, you can choose a control type.
Control types available: u CA: Be sure to install your CA temperature sensor far enough down the duct
to prevent over-cycling u RA: If you are only feeding one space this is a useful control method.
6.3.3 Cooling Types
The following cooling types are supported: u On/Off: one-stage DX or heat pump–See Combined Tempering for heat pump operation u 2 stage: two-stage DX or heat pump–See Combined Tempering for heat pump operation u CW Mod: 0­10VDC signal to a chilled water valve, also used in Dual Temp Coil–See
Combined Tempering. u VRF–See Combined Tempering
The cooling type is set at the top of this screen.

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6.3.3.1 On/Off: One Stage of Cooling
If this is a one-stage heat pump, see Combined Tempering.
The mode is determined by the outdoor temperature and the cooling lockout temperature settings.

This type of cooling cycles one stage of cooling to maintain the cooling setpoint. You must set a hysteresis value whereby the stage will turn on at the setpoint + hysteresis and turn at setpoint. There is also a minimum on and off time to prevent over-cycling.

ON Increasing temperature turns
mode ON at setpoint + hysteresis

OFF

Decreasing temperature turns mode OFF at setpoint

Setpoint

Hysteresis Setpoint + Hysteresis

TEMPERATURE

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The cooling status can be monitored in the Unit Status. The screen shows: u Cooling Control Variable which will be supply or return air, as selected. u Cooling setpoint u Whether cooling enable 1 is ON u Cooling Status

The cooling status values are shown. Multiple values may be true.

MESSAGE Cool Locked Out by OA Lockout Overlap
Econ Only Econ Mode Unit OFF

MEANING The cooling OA lockout is lower than the OA temperature. The OA lockouts for heating and cooling overlap. (No vent mode). The heating takes preference. If economizer is open less than 100%. If in economizer mode. Unit is off.

6.3.3.2 2-Stage: Two Stages of Cooling
If this is a two-stage heat pump, see Combined Tempering.
The mode is determined by the outdoor temperature and the cooling lockout temperature settings.

This type of cooling turns cycles two stages of cooling to maintain the cooling setpoint. You must set a prop band value. This value represents 100%; the wider the prop band the slower the response. Then you specify the “on point” for stages one and two in percentages. Stage one will turn off at setpoint and stage two will turn off at the on point for stage one. There is also a minimum on and off time to prevent over-cycling.

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0% 25%

75% 100%

STAGE 1 ON

STAGE 2 ON

Stage 1 turns on a 25% and Stage 2 at 75% of prop band

STAGE 2 OFF
STAGE 1 OFF

Stage 2 turns off at 25% and Stage 1 at 0% of prop band

Setpoint

Proportional Band

Setpoint + Proportional Band

TEMPERATURE

Example: In this case 4°F = 100% which means that 1°F = 25%, which makes our calculation easy. With the default settings, stage 1 turns on at 66.2 + 1 = 63.2. Stage 2 turns on at 66.2 + 3 = 65.2.

The cooling status can be monitored in the Unit Status. The screen shows: u Cooling Control Variable which will be supply or return air, as selected u Cooling setpoint u Whether cooling enable 1 (stage 1) and cooling enable 2 (stage 2) are ON u Cooling demand, expressed as a percentage of proportional band u Cooling Status

The cooling status values are shown. Multiple values may be true.

MESSAGE Cool Locked Out by OA Lockout Overlap
Econ Only Econ Mode Unit OFF

MEANING The cooling OA lockout is lower than the OA temperature. The OA lockouts for heating and cooling overlap. (No vent mode). The heating takes preference. If economizer is open less than 100%. If in economizer mode. Unit is off.

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6.3.3.3 CW Mod: Chilled Water Modulating Coil
If this is a dual temp coil used for heating and cooling, see Combined Tempering.
The mode is determined by the outdoor temperature and the cooling lockout temperature settings.

This type of cooling modulates a 0­10VDC chilled water valve using PI control. The KP and Ti can be adjusted to fine tune the control. The NO4 cooling enable contact is engaged whenever the cooling output is at 1% or higher.

The cooling status can be monitored in the Unit Status. The screen shows:
u Cooling Control Variable which will be supply or return air, as selected u Cooling setpoint u Whether cooling enable 1 ON u Command (0­100%) to valve, where 0 = 10VDC output and 100% = 0VDC. u Cooling Status

The cooling status values are shown. Multiple values may be true.

MESSAGE Cool Locked Out by OA Lockout Overlap
Econ Only Econ Mode Unit OFF

MEANING The cooling OA lockout is lower than the OA temperature. The OA lockouts for heating and cooling overlap. (No vent mode). The heating takes preference. If economizer is open less than 100%. If in economizer mode. Unit is off.

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6.4 COMBINED TEMPERING
Combined Tempering are methods where the same control is used for heating and cooling. These types include: u Single-stage heat pump with or without auxiliary heat u Two-stage heat pump with or without auxiliary heat u VRF with or without auxiliary heat u Dual Temp water coil which supplies heating or cooling, depending upon season
These methods require that both heating and cooling be enabled in the Unit Configuration.
6.4.1 Heat Pump 1-Stage: with or without 0­10VDC Aux Heat
This type requires cooling type On/Off and heating type On/Off. These type settings are made in the Control Settings.

6.4.1.1 Heat Pump 1-Stage Mode
The mode is determined by the outdoor temperature and the heating and cooling lockout temperature settings.

6.4.1.2 Heat Pump 1-Stage Cooling Operation
This type of cooling cycles one stage of cooling to maintain the cooling setpoint. You must set a hysteresis value whereby the stage will turn on at the setpoint + hysteresis and turn at setpoint. There is also a minimum on and off time to prevent over-cycling.
If in cooling mode, and the unit calls for cooling, it puts the tempering mode output used for a reversing valve, in the cool position and after a delay, will turn the compressor on and off to maintain the cooling setpoint.

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ON Increasing temperature turns
mode ON at setpoint + hysteresis

OFF

Decreasing temperature turns mode OFF at setpoint

Setpoint

Hysteresis Setpoint + Hysteresis

TEMPERATURE

6.4.1.3 Heat Pump 1 Stage Heating Operation

This type of heating cycles one stage of compressor to maintain the heating setpoint while the reversing valve is in heat mode. There is also an option to use axillary heat when the OA is below a certain temperature. You must set a hysteresis value whereby the stage will turn on at the setpoint + hysteresis and turn at setpoint. There is also a minimum on and off time to prevent over- cycling.

If in heating mode, and the unit calls for heating, it puts the tempering mode output used for a reversing valve, in the heat position and after a delay, will turn the compressor on and off to maintain the heating setpoint.

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ON

Decreasing temperature turns

mode ON at setpoint + hysteresis

Increasing temperature
OFF turns mode OFF at setpoint

Hysteresis

Setpoint – Hysteresis

Heat Setpoint

TEMPERATURE

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6.4.1.4 Heat Pump 1-Stage Auxiliary Heat
The unit allows you to use an 0­10VDC auxiliary heat source when the outdoor temperature is very cold. It will run a PI control to maintain the heat setpoint with the aux heat instead of the heat pump. If you have an auxiliary 0­10VDC heat source: u Set the Aux Heat Src? To YES u Set the outdoor temperature at which the unit will change from using the heat pump to
aux heat. u Adjust the KP and Ti for the PI loop, if necessary.

6.4.1.5 Heat Pump 1-Stage Reversing Valve
The reversing valve controls which direction the refrigerant flows. On change of mode (i.e. cool to heat), there will be a delay before the compressor turns on to allow the valve to come into position.
Reversing valve settings: u Delay: This is the delay between the heating and cooling changeover where the compressor
will not be turned on to allow the valve to get into position. u Contact Open: Choose to have the contact open in heat or cool.

6.4.1.6 Heat Pump 1 Stage System Monitoring
The heat pump is monitored with heating and cooling screens as well as a reversing valve screen and if auxiliary heat is enabled, a screen showing its status.

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TEMPERING CONTROL ERV

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The heat pump status values are shown. Multiple values may be true.

MESSAGE Cool Locked Out by OA Heat Locked out by OA Lockout Overlap
Econ Only Econ Mode Unit OFF Aux Heat Mode IN HEAT MODE IN COOL MODE Valve Positioning

MEANING The cooling OA lockout is lower than the OA temperature. The heating OA lockout is higher than the OA temperature. The OA lockouts for heating and cooling overlap. (No vent mode). The heating takes preference. If economizer is open less than 100%. If in economizer mode. Unit is off. OA temp is cold enough that the auxiliary heat is used. Valve is positioned for heat mode. Valve is positioned for cool mode. Reversing valve is positioning. Not heat or cool is on during this time.

6.4.2 Heat Pump 2-Stage: with or without 0­10VDC Aux Heat This type requires cooling type 2-stage and heating type HP 2-Stage.

6.4.2.1 Heat Pump 2-Stage Mode
The mode is determined by the outdoor temperature and the heating and cooling lockout temperature settings.

6.4.2.2 Heat Pump 2-Stage Cooling Operation
This type of cooling cycles two stages of cooling to maintain the cooling setpoint. You must set a prop band value. This value represents 100%; the wider the prop band the slower the response. Then you specify the “on point” for stages one and two in percentages. Stage one will turn off at setpoint and stage two will turn off at the on point for stage one. There is also a minimum on and off time to prevent over-cycling.
If in cooling mode, and the unit calls for cooling, it puts the tempering mode output used for a reversing valve, in the cool position and after a delay, will turn the compressor on and off to maintain the cooling setpoint.

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TEMPERING CONTROL ERV

0% 25%

75% 100%

STAGE 1 ON

STAGE 2 ON

Stage 1 turns on a 25% and Stage 2 at 75% of prop band

STAGE 2 OFF
STAGE 1 OFF

Stage 2 turns off at 25% and Stage 1 at 0% of prop band

Setpoint

Proportional Band

Setpoint + Proportional Band

TEMPERATURE

Example: In this case 4°F = 100% which means that 1°F = 25%, which makes our calculation easy. With the default settings, stage 1 turns on at 66.2 + 1 = 63.2. Stage 2 turns on at 66.2 + 3 = 65.2.

6.4.2.3 Heat Pump 2-Stage Heating Operation
This type of cooling cycles two stages of heating to maintain the heating setpoint. You must set a prop band value. This value represents 100%; the wider the prop band the slower the response. Then you specify the “on point” for stages one and two in percentages. Stage one will turn off at setpoint and stage two will turn off at the on point for stage one. There is also a minimum on and off time to prevent over-cycling.
If in heating mode, and the unit calls for heating, it puts the tempering mode output used for a reversing valve, in the heat position and after a delay, will turn the compressors on and off to maintain the heating setpoint.

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TEMPERING CONTROL ERV

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100% 75%
STAGE 2 ON

25%

0%

STAGE 1 ON

Stage 1 turns on a 25% and Stage 2 at 75% of prop band

STAGE 2 OFF

Stage 2 turns off at 25% and Stage 1 at 0% of prop band
STAGE 1 OFF

Setpoint Proportional Band

Proportional Band

Setpoint

TEMPERATURE

Example: In this case 4°F = 100% which means that 1°F = 25%, which makes our calculation easy. With the default settings, stage 1 turns on at 75.2 – 1 = 74.2. Stage 2 turns on at 75.2 – 3 = 72.2.

6.4.2.4 Heat Pump 2-Stage Auxiliary Heat
The unit allows you to use a 0­10VDC auxiliary heat source when the outdoor temperature is very cold. It will run a PI control to maintain the heat setpoint with the aux heat instead of the heat pump. If you have an auxiliary 0­10VDC heat source: u Set the Aux Heat Src? To YES u Set the outdoor temperature at which the unit will change from using the heat pump to
aux heat u Adjust the KP and Ti for the PI loop, if necessary.

54 1.800.627.4499

6.4.2.5 Heat Pump 2-Stage Reversing Valve
The reversing valve controls which direction the refrigerant flows. On change of mode (i.e. cool to heat), there will be a delay before the compressor turns on to allow the valve to come into position.
Reversing valve settings: u Delay: This is the delay between the heating and cooling changeover where the compressor
will not be turned on to allow the valve to get into position. u Contact Open: Choose to have the contact open in heat or cool.

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TEMPERING CONTROL ERV

6.4.2.6 Heat Pump 2-Stage System Monitoring
The heat pump is monitored with heating and cooling screens as well as a reversing valve screen and if auxiliary heat is enabled, a screen showing its status.

The heat pump status values are shown. Multiple values may be true.

MESSAGE Cool Locked Out by OA Heat Locked out by OA Lockout Overlap
Econ Only Econ Mode Unit OFF Aux Heat Mode IN HEAT MODE IN COOL MODE Valve Positioning

MEANING The cooling OA lockout is lower than the OA temperature. The heating OA lockout is higher than the OA temperature. The OA lockouts for heating and cooling overlap. (No vent mode). The heating takes preference. If economizer is open less than 100%. If in economizer mode. Unit is off. OA temp is cold enough that the auxiliary heat is used. Valve is positioned for heat mode. Valve is positioned for cool mode. Reversing valve is positioning. Not heat or cool is on during this time.

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TEMPERING CONTROL ERV

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6.4.3 VRF This type requires cooling type VRF and heating type VRF
6.4.3.1 VRF Mode The mode is determined by the outdoor temperature and the heating and cooling lockout temperature settings.

Based on whether the unit is in heating or cooling mode, the controller will set the tempering mode output in the correct position according to this setting. The minimum and maximum vales are also set here, as well as whether the cooling minimum demand coincides with the analog minimum or maximum.

6.4.3.2 VRF Cooling Operation
This type of cooling modulates a 0­10VDC output using PI control to maintain the cooling setpoint. The KP and Ti can be adjusted to fine tune the control. The NO4 cooling enable contact is engaged whenever the cooling demand is at 1% or higher.

6.4.3.3 VRF Heating Operation
This type of heating modulates a 0­10VDC output using PI control to maintain the heating setpoint. The KP and Ti can be adjusted to fine tune the control. The NO4 cooling enable contact is engaged whenever the heating demand is at 1% or higher.

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TEMPERING CONTROL ERV

6.4.3.4 VRF Monitoring This screen is available for monitoring the system in Unit Status.

The VRF status values are shown. Multiple values may be true.

MESSAGE Cool Locked Out by OA Heat Locked out by OA Lockout Overlap
Econ Only Econ Mode Unit OFF Aux Heat Mode VRF On IN HEAT MODE IN COOL MODE

MEANING The cooling OA lockout is lower than the OA temperature. The heating OA lockout is higher than the OA temperature. The OA lockouts for heating and cooling overlap. (No vent mode.) The heating takes preference. If economizer is open less than 100%. If in economizer mode. Unit is off. Auxiliary Heat is used. VRF is used (rather than aux heat). Valve is positioned for heat mode. Valve is positioned for cool mode.

6.4.4 Dual Temperature Coil
The dual temperature coil is a coil which provides heating in the winter and cooling in the summer by changing the temperature of the fluid in the coil. To do this, the coil needs to know what type of fluid (hot or cold) is being provided. It will lock out cooling in heat mode and vice versa. The only method for this is a BMS command. Therefore, the system must be equipped with a BMS system for this control.
The BACnet objects for this are: u BV 60 BMS_SetHeatCool: 0 = No, 1 = Yes. This enables the control. This can also be set in
the screen below. u BV 61 BMS_HeatCoolMode: 0 = Heat, 1 = Cool. This sets the type. The current setting can
be seen in the screen below for troubleshooting.
The Modbus Registers for this are: u Coil 4 BMS_SetHeatCool: 0 = No, 1 = Yes. This enables the control. This can also be set in
the screen below. u Coil 5 BMS_HeatCoolMode: 0 = Heat, 1 = Cool. This sets the type. The current setting can
be seen in the screen below for troubleshooting.

This type requires cooling type CW Mod and heating type DualTempCoil.

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6.4.4.1 Dual Temperature Coil Mode
The mode is determined by the OA temperature and the heating and cooling lockout temperature settings as well as the BMS command. Both heating or cooling demand drive the same cooling command analog and cooling enable digital output.

6.4.4.2 Dual Temperature Coil Cooling Operation
This type of cooling modulates a 0­10VDC cooling command output using PI control to maintain the cooling setpoint. The KP and Ti can be adjusted to fine tune the control. The NO4 cooling enable contact is engaged whenever the cooling demand is at 1% or higher.

NOTE: The valve control can be set directly from the BMS if you change Valve control to BMS.

6.4.4.3 Dual Temperature Coil Heating Operation
This type of heating modulates a 0­10VDC cooling command output using PI control to maintain the heating setpoint. The KP and Ti can be adjusted to fine tune the control. The NO4 cooling enable contact is engaged whenever the heating demand is at 1% or higher.

6.4.4.4 Dual Temperature Coil System Monitoring This screen is available for monitoring the system in Unit Status.

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TEMPERING CONTROL ERV

The Dual Temperature Coil status values are shown. Multiple values may be true.

MESSAGE Cool Locked Out by OA Heat Locked out by OA Lockout Overlap
Econ Only Econ Mode Unit OFF Set BMS Heat/Cool!!
BMS Mode set to Heat BMS Mode set to Cool IN HEAT MODE IN COOL MODE

MEANING The cooling OA lockout is lower than the OA temperature. The heating OA lockout is higher than the OA temperature. The OA lockouts for heating and cooling overlap. (No vent mode.) The heating takes preference. If economizer is open less than 100%. If in economizer mode. Unit is off. In order to work properly, the BMS must be set to give a heat/ cool command. BMS is setting the mode to heat. No cooling is allowed. BMS is setting the mode to cool. No heating is allowed. Valve is positioned for heat mode. Valve is positioned for cool mode.

6.5 ECONOMIZER CONTROL (BYPASS/FREE COOLING)
All ERV units that are equipped with a bypass damper allow the incoming air bypass the enthalpic plate.
The economizer settings are: u Temperature u Enthalpy u Disabled

Economizer based on Enthaply Sequence: When the OA temperature is below the RA temperature less the hysteresis value, the economizer will bypass the core with incoming air.
The economizer will be locked out when: u The OA temperature is less than the economizer adjustable low lockout. u The RA temperature is below the adjustable low lockout u Heating is enabled

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SPECIAL FEATURES

These features are not common but are available in the ERV controller.
7.1 FROST CONTROL
ERV units utilize the optional bypass damper to bypass the core when it is very cold outside. This is usually used in northern states and Canada. To enable the frost control functionality for these units the Enable Frost Cntl must be set to YES in the Unit Configuration (password protected) screen.

The frost control function disables the supply fan and closes the OA damper when the following conditions are met: u The OA temperature is less than the OA Below set point u The EA temperature (sensed at the inlet to the EA fan–average exhaust air temperature) is
below the EA Below set point.
For variable speed fans, an additional setting is required for the exhaust fan operation. While the supply fan is off, a variable speed exhaust fan (ECM or VFD) will operate at the command set by the FC Exh Command set point. This command allows the user to minimize the negative space pressure that will be generated with the EF on and the SF off during frost control.
For fans that are not variable speed, the exhaust fan will run at the normal speed and this setting will not be shown.

The frost control mode ends (OA damper is opened and the supply fan is enabled) when the EA temperature increases to the EA Above set point. The unit then resumes the selected normal operating mode. If the EA temperature then falls below the OA Below set point frost control mode is enabled again.
There is a Unit Status screen that will appear if frost control function is enabled.

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SPECIAL FEATURES ERV

7.2 SINGLE FAN MODE
In some cases the application may require that only one fan run. The single fan mode is initiated by either closing the ID2 contact (terminals and 19) or a BMS command to BMSEFOnly variable. It is BV11 for BACnet and Coil 1 for Modbus, where 0 = No and 1 = Yes. The default is Exhaust Fan but it can be changed to Supply Fan here. If tracking the supply fan, also set a value for exhaust fan in single fan mode.

7B.3 USE ROOM TEMP AND HUCMIDITY RATHER THAN RETUDRN

E

The system allows you to use a room temperature and humidity sensor in place of the return air

temperature and humidity sensor. One use for this is when you have unoccupied operation when

COMDAMOPAE/FRA1 HOT COM EA/RA
DAMPER2 HOT

the fans are off, you will be able to get a temperature indicative of the actual room temperature.

This feature is useful when feeding Sensor 24 VAC X3 a s21 ingle zone. It requires the removal of the return sensors

and replace them with the room sensor. The setting here EXP U3 X3 22 0 – 10 VDC Input, CO2 Level/VOC “room” on the main screen to eliminate confusion. EXP U4 X3 23 0 – 10 VDC Output, Bypass Damper
EXP U5 X3 24 0 – 10 VDC Input, Cooling Coil LAT

will

cPhreasnsDugurceetSetnhseor word

Vin Vout

RED

BLK
GND

“retuDr4n” to
HOT Vin COM

GRY

EXP U6 X3 25 0 – 10 VDC Input, Duct Pressure

Face/Bypass

COM Recirc DAMPER3
HOT

EXP U7 X3 26

BU

Unit Supply Temp

EXP GND X3 27

10K Carel NTC

EXP U8 X3 28 0 – 10 VDC Output, HGRH Modulation

T1 Gas Module T2

EXP U9 X3 EXP U10 X3

29 0 – 10 VDC Output, Cooling Modulation 30 0 – 10 VDC Output, Heating Modulation

EXP GND X4 31

T12 (+) Gas Module
T13 ( – )For 10:1

T11(+) T10(-) For 5:1

EXP NO 3 X4 32 Open = Heating, Closed = Cooling

The Room Temperature and Humidity Sensor is EXP NO 4 X4 33 Cooling Stage 1 P/N 102397 Wall Mount, RTH-W.

SD2

Smoke Detector

OF1 EFEN2

Overflow Switch Exh Fan Only Enable

EXP NO 5 X4 EXP C3/4/5 X4

34 Cooling Stage 2
35

RA TEMP

X4

RA HUM

X4

Sensor 24 VAC X4

36
RA TempRed
37
RA HumidWht
38

02-9-A

GND X4 39 Accy COM X4 40

02-3-B 02-4-B

External Temp/Humidity Sensor

T

T

O

7.4 LIMIT SETPOINT RANGES FOR USERS
It is possible to set different limits for the heating and cooling occupied and unoccupied setpoints. The defaults are shown in these screens. This will limit the users in the front nonpassword protected screens from setting extreme setpoints.

REV. 6 5 4 3 2

DATE 4/4/2022 5/8/2020 5/5/2020 5/5/2020
5/5/2020

NAME shreyat austine austine austine austine

CHANGES Updated controller gnd connections Updated Ground Locations Added Any Alarm Output Updated External Temp and Humidity Sensor from OA to RA Updated Sensor Nomenclature

RenewAire

DN-2,3-Jxxxxx33,34,35–xGxExx–xx_006

Field Wiring

SCHEME
3

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7.5 ADJUSTMENTS FOR TWO-STAGE COOLING
There are several special settings for the two-stage cooling. u In cases where the condensing unit is tied to only the first compressor, set only allow comp 2
is comp 1 in on: to YES. (Because of minimum off times it is normally possible that the second compressor turns back on before the first). u Interstage delay: the is a delay between when the compressors are allowed to stage. It is defaulted to 180s. u Normally the second compressor turns off at the same percentage that the first turned on and the first turns off at setpoint. If you set Specify Off Values: to YES, it will turn them off at the values specified.

7.6 TURN UNIT ON AND OFF BASED ON CO2 LEVEL
The system allows you to turn the unit on and off based on CO2 Level. This is useful when the ERV has been added specifically to give more fresh air to a space when occupied, such as a church.
The CO2 sensor must be enabled and installed.

The feature needs to be enabled.

The setting for CO2 level to turn off is set, as well as a hysteresis value that is added to this to turn on and one that is subtracted from this to turn off.

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SPECIAL FEATURES ERV

7.7 FLUSH FEATURE
The flush feature is used in conjunction with the scheduler function that allows you to set the unit into flush mode for specific time periods where the exhaust fan and supply fan will run at a specified CFM or % during this period.
It is enabled in the I/O Configuration screen. You can also set whether the fans will run to a specified % or CFM.

Depending upon the last setting, you will se either one of these screens to allow you to define how the fans will run while in flush mode.

Once these setting are done, you will now have a third type of mode for the scheduler called FLUSH, as shown. In this example the unit will go into flush mode at 6:45 until 7:00 when it will turn on and run normally. During flush mode the OA and RA dampers (if included) will be open as in normal operation.

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SPECIAL FEATURES ERV

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7.8 COLD WEATHER OPERATION
The ERV has a built-in feature for detecting low temperatures to avoid dumping cold air into the space. The settings are shown in the following screen.
In versions 3.00.30 and higher, the low temperature allowed was decreased. Be sure to make sure these settings are appropriate for your application.
u If the SA Temperature falls below the low warning temperature for the delay time while the supply fan is running, the warning will sound but the unit will remain running.
u If the SA Temperature falls below the low alarm temperature for the delay time while the supply fan is running, the alarm will sound but the unit will shut down and require a manual reset to start again.

For systems that control heat, the settings are shown in the following screen.
u If the CA Temperature falls below the low warning temperature for the delay time while the supply fan is running, the warning will sound but the unit will remain running.
u If the CA Temperature falls below the low alarm temperature for the delay time while the supply fan is running, the alarm will sound but the unit will shut down and require a manual reset to start again.

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I/O AND UNIT WIRING ERV

VERIFYING I/O AND UNIT WIRING

All of the I/O values should be verified and calibrated, if necessary.
8.1 VERIFYING ALL I/O THROUGH UNIT STATUS SCREENS
All of the individual I/O are able to be viewed in one place by pressing “ENTER” when on this screen, which is located toward the and of Unit Status.

There will be individual screens for each input and output. Several examples are shown.

8.2 CALIBRATING I/O
For a temperature sensor that may have run a long distance or a humidity sensor with a reading that may have drifted over time, a calibration may be necessary. There is a screen such as the one shown for each sensor and transducer. The current value at the top will reflect the change with the offset that is set in this screen.

8.3 GENERAL UNIT CONTROL WIRING
The following tables and diagrams show the general unit control wiring for the ERV units. A unit-specific electrical schematic is found inside the access door to the core module.
8.3.1 Sensor Inputs Sensors in Grey are optional, and field-installed.

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SENSOR

TYPE

OA Temperature OA Humidity

Combined CAREL NTC/0­
10VDC

RA Temperature RA Humidity

Combined CAREL NTC/0­
10VDC

SA Temperature CAREL NTC EA Temperature CAREL NTC

OA Filter Pressure

0­10VDC

RA Filter Pressure

0­10VDC

OA Flow Rate Pressure

0­10VDC

RA Flow Rate Pressure

0­10VDC

SENSOR TERMINALS Far Left (Red) 2 (Black)
3 (Red) 4 (Black) 5 (White) Far Left (Red) 2 (Black) 3 (Red) 4 (Black) 5 (White) (Red or White) (Red or White) (Red or White) (Red or White) Vin (Red) GND (Black) Vo (White) Vin (Red) GND (Black) Vo (White) Vin (Red) GND (Black) Vo (White) Vin (Red) GND (Black) Vo (White)

CO2 Level Sensor

0­10VDC

VOC Level Sensor

0­10VDC

Space Pressure Sensor

0­10VDC

Duct Pressure Sensor

0­10VDC

CA Temp Sensor CAREL NTC

Vin GND Vo Vin GND Vo (Red or White) (Red or White)

INTERMEDIATE TERMINALS X4-39 GND X4-38 X4-39 GND X4-36 X4-39 GND X4-38 X4-39 GND X4-37 X3-21 (PWR) X3-27 (GND) X3-22 X3-21 (PWR) X3-27 (GND) X3-23 X3-21 (PWR) X3-27 (GND) X3-24 X3-21 (PWR) X3-27 (GND) X3-25 X3-26 X3-27 (GND)

CONTROLLER TERMINALS U1 (Main) GND TS2 24VAC TS1 GND TS2 U2 (Main) U3 (Main) GND TS2 24VAC TS1 GND TS2 U4 (Main) U5 (Main) GND (Main) U6 (Main) GND (Main) 24VAC TS1 GND TS2 U7 (Main) 24VAC TS1 GND TS2 U8 (Main) 24VAC TS1 GND TS2
U1 (Exp) 24VAC TS1 GND TS2
U2 (Exp)
GND TS2 U3 (Exp)
GND TS2 U4 (Exp)
GND TS2 U5 (Exp)
GND TS2 U6 (Exp) U7 (Exp) GND (Main)

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I/O AND UNIT WIRING ERV

8.3.2 Digital Inputs Inputs in Grey are optional, and field-installed.

INPUT

TYPE

INPUT TERMINALS

INTERMEDIATE TERMINALS

CONTROLLER TERMINALS

Smoke Detector Dry Contact

X2-15 X2-16

C1/2** 24VDC

ID1 Unit Enable* Dry Contact

X2-17

ID1

X2-18

GND

ID2 Single Fan Mode

Dry Contact

X2-19

ID2

X2-18

GND

SF Current Switch (SF Status)

Dry Contact

(Black) (Red)

GND TS2

U9 (Main)

EF Current Switch (EF Status)

Dry Contact

(Black) (Red)

GND TS2

U10 (Main)

*Overflow switch is wired into here if unit was ordered with one. ** Smoke alarm will interrupt the enable signal to the fans. This will cause a fan alarm.

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8.3.3 Digital Outputs
Outputs in Grey are optional, and field-installed. Heating and cooling may be factory-installed or field-installed, depending upon the unit.

OUTPUT

TYPE

OUTPUT TERMINALS

INTERMEDIATE TERMINALS

CONTROLLER TERMINALS

SF Enable

Dry Contact

(See wiring diagram)

X2-13 X2-14

NO1 (Main)

EF Enable

Dry Contact

(See wiring diagram)

X2-11 X2-12

NO2 (Main)

Bypass Damper Dry Contact

HOT

X2-07 (Red)

NO3 (Main)

COM

X2-06 (Black)

Accy COM

OA Damper

Dry Contact

HOT

X2-03 (Red)

NO4(Main)

COM

X2-02 (Black)

Accy COM

RA Damper

Dry Contact

HOT

X2-05 (Red)

NO5 (Main)

COM

X2-04 (Black)

Accy COM

Serious Alarm Output

Dry Contact*

NO6/NC6 (Main)

C6 (Main)

Heating Enable 1 Dry Contact*

X1-09 X1-08

NO1 (EXP) C1/2 (EXP)

Heating Enable 2 Dry Contact*

X1-10 X1-08

NO2 (EXP) C1/2 (EXP)

Tempering Mode Dry Contact*

X4-32 X4-35

NO3 (EXP) C3/4/5 (EXP)

Cooling Enable 1 Dry Contact*

X4-33 X4-35

NO4(EXP) C3/4/5 (EXP)

Cooling Enable 2 Dry Contact*

X4-34 X4-35

NO5 (EXP) C3/4/5 (EXP)

Any Alarm Output Dry Contact*

NO6/NC6 (EXP)

C6 (EXP)

*There is an option to use 24VAC ACCY power if it is needed to drive a 24VAC relay. For example, to drive a cooling stage 1 relay, wire as follows: u Accy 24VAC (X1-01) connected to EXP C3/4/5 (X4-35) u EXP NO4 (X4-33) Cooling stage 1 connected to one side of the 24VAC relay coil. u Accy COM (X4-40) connected to the other side of the 24VAC relay coil.

**RD units Only. All other units go directly to the terminals on the expansion module as listed on the right.

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8.3.4 Analog Outputs
Outputs in Grey are optional, and field-installed. Heating and cooling may be factory-installed or field-installed, depending upon the unit.

OUTPUT SF Signal

TYPE 0­10VDC

EF Signal

0­10VDC

Cooling Command
Heating Command

0­10VDC 0­10VDC

OUTPUT TERMINALS

INTERMEDIATE TERMINALS 01-6-D 01-2-D 01-4-D 01-2-D
X3-29 (Black) X4-31
X3-30 (White) X4-31

CONTROLLER TERMINALS Y1 (Main) GND (Main) Y2 (Main) GND (Main) U9 (EXP) GND (EXP) U10 (EXP) GND (EXP)

*RD units Only. All other units go directly to the terminals on the expansion module as listed on the right.

8.3.4.1 Wiring to Three-Wire Valves
For Cooling or Dual Temp valves, use the following wiring: Sensor signal X3-29 Common X4-31 24V Power to valve X3-21
For Heating valves, use the following wiring: Sensor signal X3-30 Common X4-31 24V Power to valve X3-21

1.800.627.4499 69

70 1.800.627.4499

A 1

2

Input Power

208-230 VAC, 3 Phase

3

460 VAC, 3 Phase

L1

4

L2

L3

5

FB3
GND

6

7

8

9

10

11

12

13

8.3.5 Sample Power Wiring Schematic

B

C

D

E

Exhaust Fan

Contactor 1L1

Overload 2T1

3L2

4T2

5L3
24 VAC A1 A2

6T3 95 96

X2 12

M1
M
3~
Exhaust Fan

Supply Fan

Contactor 1L1

Overload 2T1

3L2

4T2

5L3
24 VAC A1 A2

6T3 95 96

X2 14

M2
M
3~
Supply Fan

REV.
3 2 1 0

DATE
6/5/2019 7/31/2018 10/19/2017 10/19/2017

NAME
austine austine austine austine

CHANGES
Added Any Alarm Output Updated Damper Colors Updated G0 Connections New

Transformer

X2 20

X3 21

COM 24V Transformer

G0

Accy 24 VAC

X1 1 X2 16

COM 24V

Accy COM

X1 2

X1 4

X1 6

F1 2.5 AT

02-5-A 02-9-A 02-8-C

RenewAire

HE-2_HE-8XJxxx-x34,35xx–xAx2,4x-xx_003

Power

SCHEME
1

NOTE: This wiring schematic is TYPICAL control wiring for a three phase, 208-230VAC and 460VAC input for models HE-2X, HE3X, HE-4X, HE6X, and HE-8X. A unit-specific electrical schematic is found inside the access door to the core module.

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I/O AND UNIT WIRING ERV

1.800.627.4499 71

A 1

2
TS1
3

4

5

G 24 VAC Hot

01-10-E

6

7
TS2
8

9
01-11-E

10

G0 Common

11

12

13

B

C

D

E

TH1

T

T

OA TempRed

O

OA HumidWht

OA Temp & Hum

TH2

T

RA TempRed

T

O

RA HumidWht

RA Temp & Hum

NTC1
SA Temp NTC2
EA Temp PS1
Vin Vout GND
OA Filter Press

G

G0

U1

U2

U3

GND

U4

SA TempRed

U5

EA TempRed

U6

GND

OA 2″ FilterWht
RA 2″ FilterWht SF CurrentRed

U7 U8 U9

EF CurrentRed U10

GND

ID1

ID2

GND

N1 Carel C.pCO Mini High End (Ethernet)

PS2
Vin Vout
GND
RA Filter Press

CS1

SF CurrentRed

ID1/2/GNDWht ID1/2/GNDRed

X2 18 X2 19 X2 17

SF Current Switch CS2
EF CurrentRed

EF Current Switch

PS3
Vin Vout
GND
OA Core Press PS4
Vin Vout
GND
EA Core Press

OA 1″ CoreWht RA 1″ CoreWht

N1 Carel
C.pCO Mini High End (Ethernet)

+Vterm J3 Tx/Rx J3 Tx/Rx +
GND J4 Tx/RxJ4 Tx/Rx+
GND Ethernet
Y1 Y2 GND NO1 C1/2 NO2 NO3 C3/4/5 NO4 C3/4/5 NO5 NO6 NC6 C6

01-11-E

TX/RXBlk TX/RXRed
NO1/2/CRed X2 13 NO1/2/CBlk X2 15 NO1/2/CWht X2 11 NO3/4/5Red X1 7 NO3/4/5Blk X1 3 NO3/4/5Wht X1 5
Accy 24 VAC

N2 Carel Expansion Module
C.pCO E

U3 U4 U5 U6

EXP U3/4/5Red X3 EXP U3/4/5Blk X3 EXP U3/4/5Wht X3 EXP U6/GND/U7Red X3

22 23 24 25

GND U7 U8 U9 U10

X3
EXP U6/GND/U7Wht X3 EXP U8/9/10Red X3 EXP U8/9/10Blk X3 EXP U8/9/10Wht X3

27 26 28 29 30

GND NO1 C1/2 NO2

EXP NO1/2/CRed X1 EXP NO1/2/CBlk X1 EXP NO1/2/CWht X1

9 8 10

NO3

C3/4/5

NO4

C3/4/5

NO5

NO6

NC6

C6

G G0 U1 U2 GND J6 Tx/RxJ6 Tx/Rx+

N2 Carel
C.pCO E
Expansion Module

Not Used

N1 Carel C.pCO Mini High End (Ethernet)

V bat CAN L CAN H
GND J7 1 J7 2 J7 3 J7 4 J7 5 J7 6 +5VREF GND +V dc

N2 Carel Expansion Module C.pCO E

V bat GND +5VREF GND +V dc

REV.
3 2 1 0

DATE
6/5/2019 7/31/2018 10/19/2017 10/19/2017

NAME
austine austine austine austine

CHANGES
Added Any Alarm Output Updated Damper Colors Updated G0 Connections New

RenewAire

HE-2_HE-8XJxxx-x34,35xx–xAx2,4x-xx_003

Control

SCHEME
2

NOTE: This wiring schematic is TYPICAL control wiring for a three phase, 208-230VAC and 460VAC input for models HE-2X, HE3X, HE-4X, HE6X, and HE-8X. A unit-specific electrical schematic is found inside the access door to the core module.

8.3.6 Sample Control Wiring Schematic

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NOTE: This wiring schematic is TYPICAL control wiring for a three phase, 208-230VAC and 460VAC input for models HE-2X, HE3X, HE-4X, HE6X, and HE-8X. A unit-specific electrical schematic is found inside the access door to the core module.

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8.3.7 Sample Field Wiring Schematic

A

B

C

D

E

1

2

Accy 24 VAC X1 1 Accy COM X1 2

NO 4

X1 3

3

Accy COM NO 5

X1 4 X1 5

Accy COM X1 6

4

NO 3 EXP C1/2

X1 7 X1 8

BLK

COM OA/FA

BL

RED

DAMPER1 HOT

ORG

BLK/PK COM EA/RA

BL

RED/BR

DAMPER2 HOT

YEL

PUR

COM Bypass

YEL

ORG

DAMPER3 HOT

BL

EXP NO 1

X1 9 Heating Enable/Stage 1

5

EXP NO 2 NO 2

X1 10 Heating Stage 2
X2 11

EF En

X2 12

Factory Jumper – remove if damper end switch is used

6

NO 1 SF En

X2 13 X2 14

Factory Jumper – remove if damper end switch is used

C1/2

X2 15

7

Accy 24 VAC

X2 16

Factory Jumper

SD1

Smoke Detector

Unit Enable

X2 17

Sensor COM

X2 18

Factory Jumper

UE1

Unit Enable

8

EF Only Enable X2 19

Sensor 24 VAC X2 20

EFEN1

Exh Fan Only Enable

Sensor 24 VAC X3 21
EXP U3 X3 22 0 – 10 VDC Input, CO2 Level EXP U4 X3 23 0 – 10 VDC Input, VOC Level EXP U5 X3 24 0 – 10 VDC Input, Space Pressure EXP U6 X3 25 0 – 10 VDC Input, Duct Pressure EXP U7 X3 26 Unit Supply Air Temp Sensor COM X3 27
EXP U8 X3 28

EXP U9 X3 EXP U10 X3

29
30 0 – 10 VDC Output, Heating Modulation

9

10

11

12

13

REV.

DATE

NAME

CHANGES

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ALARMS AND TROUBLESHOOTING

If the problem is caused by an alarm, the first step in troubleshooting is to view the Alarm screens. Press the Alarm button on the face of the controller to see all current alarms and what function or component is causing the alarm. In some cases, the Alarm pre-set may need to be adjusted or an offset may need to be changed. Before making any changes to the controller programming, be certain to have an updated Backup file so that current settings can be easily restored, if needed. See the following Alarms section for these.
Problems with an air handler are sometimes strictly mechanical, in which a fan or damper or some other component simply stops working. Mechanical problems are easily traced to specific components by using the Test End Device feature in the service level. See the following Test End Devices section for this.
In other cases, problems may be caused by the air handler trying to overcome a pre-set or operating parameter that has been set by the user. In these cases, view the controller screens to trace the problem. See Other Common Problems section for these.
9.1 ALARMS
The alarms are viewed through the controller screen or through the BMS.
9.1.1 Acknowledging Alarms
When an alarm occurs, you will hear a buzzer sound and the alarm light will flash. Press the alarm button to acknowledge the alarm and quiet the buzzer.
9.1.2 Viewing Alarms and Alarm Log
If there are active alarms the alarm button will be red. To view the active alarms, press the alarm button. Each alarm has an alarm number (AL*11, in this case), a time stamp, and a message to show which alarm occurred.

Continue to press the button to cycle through all active alarms. At the end you will see this screen. Here you can press “ENTER” to see the past alarms.

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An alarm log screen looks like this. If the event is Stop, it shows the time that the alarm went away. If the event is Start, it shows the time that the alarm first occurred. There may be up to 50 entries.

If no alarms are active, the screen will say No Alarms but you can still press “ENTER” to view the last 50 alarm occurrences.

9.1.3 Resetting Alarms
If you cycle through the alarms, you will see this screen. At this time, you can hold the alarm button down to reset the “User Reset” alarms. (The auto reset alarms reset themselves.)

9.1.4 Alarm Digital Outputs
The controller includes a digital output for remote indication of an alarm condition.
The first is AlarmOut.val and it closes the contact if there is an alarm that will shut down the unit. These include: u Low Supply Temperature Alarm u High Supply Temperature Alarm u Loss of communication between the controller and the expansion module u Exhaust Fan Alarm (Failure to start) u Supply Fan Alarm (Failure to start) ONLY IF the SF Alarm Unit Run? is set to No. If yes, the
unit will not shut down and the exhaust fan will be allowed to continue to run. All heating and cooling functions will be locked out, however.

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The second is AnyAlarmOut.val and it closes the contact if there is any alarm including the ones in AlarmOut.val.
The physical connection for the first is made at the controller and the second is made at the expansion module. Both are terminated at the same terminal, J12, located in the upper right corner. There is both a normally open (NO6 to C6) and normally closed (NC6 to C6) option.

9.1.5 Specific Alarms and Their Meaning The alarms are identified by number. The are grouped by type. Alarms 50­57, alarms 66­68.

9.1.5.1 General Alarms

NUMBER 0
1 2
3 4 5

NAME Al_retain

STATUS SHOWN User reset

Al_Err_retain_write User reset

Al_Device_Test

Auto reset

Al_BMS_Offline

Auto reset

OfflineAlrm_CPCOE_1 Auto reset

CfgErrAlrm_CPCOE_1 Auto reset

MEANING Error in the number of retain memory writings
Error in retain memory writings
Device Test is Running– Outputs Disabled!
Device offline alarm to BMS
Device offline alarm CPCOE
Wrong configuration on device CPCOE

Alarm Number 0: Error in the number of retain memory writings This usually means indicates that the BMS is writing to a retained setpoint too often. Retained values are stored in a special memory so that they are kept on power loss. Failure to correct this could result in damage to the controller.
Alarm Number 1: Error in retain memory writings This usually means indicates that the BMS is writing to a retained setpoint too often. Retained values are stored in a special memory so that they are kept on power loss. Failure to correct this could result in damage to the controller.
Alarm Number 2: Device Test is Running–Outputs Disabled! This alarm occurs if someone had the unit in device test mode and the time limit has passed, usually an hour. Either cycle power to the unit or go into the Device Test section in the password protected menus and turn it off.
Alarm Number 3: Device offline alarm to BMS This alarm occurs if the BMS is enabled, and it is offline.
Alarm Number 4: Device offline alarm CPCOE This alarm occurs if the controller and expansion module have lost communication. For correct operation the dipswitches are set (left to right) Forward, backward, forward, backward, forward, forward, forward, forward. This coincides with an address of 5. Sometimes if they have been moved around it is necessary to set them all to OFF (forward), cycle power, and then set them as required, and then cycle power again.
u Check the wiring: FBUS on the controller to BMS on the expansion. u Check that the dipswitches are positioned correctly.

NOTE: The green LED indicates communication status on the BMS port. If there is communication on the BMS port (online) the green LED flashes, if there is no communication (offline) the LED stays on steady.

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Alarm Number 5: Wrong configuration on device CPCOE This alarm is an internal alarm. Contact TSS if this alarm occurs.

9.1.5.2 Supply and Exhaust Alarms

NUMBER 10 11

NAME Al_SupplyFan Al_ExhaustFan

STATUS SHOWN User reset User reset

MEANING Supply Fan Alarm Exhaust Fan Alarm

Alarm Number 10: Supply Fan Alarm
This indicates that either the supply fan did not start, or that the current switch did not register the supply fan as running. Refer to the Supply or Exhaust Fan Alarm Troubleshooting section in the Test End Devices.
The delay for this alarm is set here. The setting is shared with the exhaust fan. Whether the unit shuts down if this alarm occurs is also set here.

Alarm Number 11: Exhaust Fan Alarm
This indicates that either the exhaust fan did not start, or that the current switch did not register the exhaust fan as running. Refer to the Supply or Exhaust Fan Alarm Troubleshooting section in the Test End Devices.
The delay for this alarm is set here. The setting is shared with the supply fan. This alarm will shut the unit down.

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9.1.5.3 Airflow Condition Alarms

NUMBER 12 13 14 15 16
17
18
19
20 21

NAME Al_SA_Airflow Al_EA_Airflow Al_SA_StaticPress Al_CO2 Al_SupAirLow Temp_Warn Al_SupAirLow Temp_ A larm Al_SupAir_HiTemp Warn Al_SupAir_HiTemp Alarm Al_VOC Al_EA_StaticPress

STATUS SHOWN Auto reset Auto reset Auto reset Auto reset User reset
User reset
User reset
User reset
User Reset Auto reset

MEANING Supply Airflow Alarm Exhaust Airflow Alarm SA Static Pressure Level Alarm CO2 Level Alarm Low SA Temp Warning
Low SA Temp Shutdown
High SA Temp Warning
High SA Temp Shutdown
VOC Alarm EA Static Pressure Level Alarm

Alarm Number 12: Supply Airflow Alarm
This alarm occurs when the supply is set to control on supply flow (CFM). It indicates that the flow measured is out of tolerance set here for more than the alarm delay set here.

This usually indicates that the unit is probably hunting and the KP (gain) for the PI control needs to be adjusted. Set the KP to 0.1 or 0.2 to start. If it responds too slow, you can increase it but these values are usually acceptable.

Alarm Number 13: Exhaust Airflow Alarm
This alarm occurs when the supply is set to control on exhaust flow (CFM). It indicates that the flow measured is out of tolerance set here for more than the alarm delay set here.

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This usually indicates that the unit is probably hunting and the KP (gain) for the PI control needs to be adjusted. Set the KP to 0.1 or 0.2 to start. If it responds too slow, you can increase it but these values are usually acceptable.

Alarm Number 14 and 21: Supply and Exhaust Air Static Pressure Level Alarms These alarms occur when the supply fan is set to control on duct static pressure, or the exhaust fan is set to control on return static pressure. It indicates that the pressure measured is out of tolerance set here for more than the alarm delay set here.
First make sure the pressure sensor is enabled in the I/O configuration and that there is a reading in the Unit Status. If you don’t see this screen the sensor is not enabled. If the sensor is not reading correctly, check the wiring and calibration screen.

If the sensor is reading correctly, this usually indicates that the unit is probably hunting and the KP (gain) for the PI control needs to be adjusted. Decrease the KP to slow the response Increase to get a faster response.

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Alarm Number 15 and 20: CO2 or VOC Level Alarm
This alarm occurs when the CO2 or VOC sensor is enabled, and the CO2 or VOC level rises above the level set in this screen for more that the delay time.

First make sure the pressure sensor is reading correctly in the Unit Status. If the sensor is not reading correctly, check the range settings in I/O Configuration, the wiring, and the calibration screen.

If the sensor is reading correctly, the CO2/VOC level is too high. You may have to adjust the fan control to keep it within limits.
Alarm Numbers 16 and 17: Low SA Temp Warning and Low SA Temp Shutdown
In units without heating, the alarm applies to the supply temperature (SA). In units with heating, this alarm applies to the unit supply temperature that is measured after the heating unit.
First, view the sensor value in Unit Status. If it seems OK, then check the alarm levels set here. (Only one will show, depending upon whether you have a Unit Supply Temp Sensor). The difference in the two is that the warning will just show as an alarm while the shutdown will shut down the unit. You can use the warning as a warning set at higher temperature for the purposes of warning. You can also just use one or the other by setting the limits of the one you do not want to use very low.

Alarm Numbers 18 and 19: High SA Temp Warning and High SA Temp Shutdown
This alarm only applies to units with cooling and applies to the CA Temperature.
First, view the sensor value in Unit Status. If it seems OK, then check the alarm levels set here. The difference in the two is that the warning will just show as an alarm while the shutdown will shut down the unit. You can use the warning as a warning set at lower temperature for the purposes of warning. You can also just use one or the other by setting the limits of the one you do not want to use very high.

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9.1.5.4 Sensor Alarms

NUMBER 30 31 32 33 34 35 36
37
38
39
40 41 42 44

NAME

STATUS SHOWN

Al_OA_Temp_Prb Auto reset

Al_OA_Hum_Prb

Auto reset

Al_RA_Temp_Prb Auto reset

Al_RA_Hum_Prb

Auto reset

Al_SA_Temp_Prb Auto reset

Al_EA_Temp_Prb Auto reset

Al_OA_Flt_Press_Prb Auto reset

Al_RA_Flt_Press_Prb Auto reset

Al_OA_FlowRate Prb Al_EA_FlowRate Prb Al_CO2_Level_Prb Al_Duct_Press_Prb Al_Supply_Temp_Prb Al_VOC_Level_Prb

Auto reset
Auto reset
Auto reset Auto reset Auto reset Auto reset

MEANING OA Temperature Sensor Error OA Humidity Transducer Error RA Temperature Sensor Error RA Humidity Transducer Error SA Temperature Sensor Error EA Temperature Sensor Error OA Filter Pressure Transducer Alarm RA Filter Pressure Transducer Alarm OA Flow Rate Sensor Error
EA Flow Rate Sensor Error
CO2 Sensor Error Duct Pressure Probe Error CA Temperature Sensor Error VOC Sensor Error

Alarm Numbers 30­44: Sensor Alarms
These alarms occur when the controller detects that sensor is not reading in the expected range. Passive sensors such as temperature sensors show an error when the controller detects a short circuit or open circuit. Active sensors (0­10V) are in alarm when they value read is slightly above 10V.
To resolve the alarms, check the wiring to see if there is a loose wire or missing sensor.

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9.1.5.5 Filter Alarms

NUMBER 60 61

NAME Al_OA_Flt_Press Al_RA_Flt_Press

STATUS SHOWN Auto reset Auto reset

MEANING OA Filter Pressure Alarm RA Filter Pressure Alarm

Alarm Numbers 60­61: Filter Alarms
These alarms occur when the pressure exceeds the OA Level or the RA Level as set in the Alarm Settings.
For more information refer to Pressure Drop Charts in the unit specific IOM.

To resolve the alarms, change the filter. If the alarm is still active, verify that the reading is as expected in the Unit Status. If not, check that someone has not changed the pressure transducer range in the I/O Configuration. Also check the offset or override for the sensors.

9.1.5.6 Maintenance Alarms

NUMBER

NAME

62

Al_UnitLife

64

Al_SupplyFanLife

65

Al_ExhaustFanLife

STATUS SHOWN Auto reset
Auto reset
Auto reset

MEANING
Unit Service Threshold Reached
Supply Fan Service Threshold Reached
Exhaust Fan Service Threshold Reached

Alarm Numbers 62­65: Maintenance Alarms
These alarms occur when the number of run hours reaches the thresholds set in the Advanced Service. A typical screen is shown here.

Refer to the Advanced Service for more information on these settings.

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9.2 TEST END DEVICES
The Test End Devices allows you to manually control outputs for testing. The unit must be off for this feature to be enabled. An alarm will occur in one hour (default) if you forget to take the device out of test mode.
Once done. Make sure you cycle power to end test

References

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