RenewAire EV450 Premium Commercial Controls Instruction Manual
- June 15, 2024
- RenewAire
Table of Contents
- RenewAire EV450 Premium Commercial Controls
- Product Information
- Product Usage Instructions
- FAQs
- UNIT INFORMATION
- OVERVIEW
- CONTROLLER OVERVIEW
- GENERAL FLOW FOR SETUP AND RUNNING UNIT
- UNIT CONFIGURATION
- 22
- 20
- 18
- 16
- 14
- 12
- TEMPERING CONTROL
- SPECIAL FEATURES
- VERIFYING I/O AND UNIT WIRING
- ALARMS AND TROUBLESHOOTING
- References
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
RenewAire EV450 Premium Commercial Controls
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.
1.800.627.4499 3
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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TEMPERING CONTROL ERV
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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TEMPERING CONTROL ERV
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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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TEMPERING CONTROL ERV
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.
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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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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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SPECIAL FEATURES ERV
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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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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
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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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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
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NAME
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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