RenewAire HE Series Energy Recovery Ventilator Outdoor Instruction Manual

RenewAire HE Series Energy Recovery Ventilator Outdoor

HE-Series Outdoor

WARNING

• Standard HE1.5XRT with single-phase original equipment motors are NOT suitable for use with solid-state speed control.
• Three-phase motors are NOT suitable for use with solid-state speed control. If speed control is desired use the VFD option.
• Single-phase ECM motors are NOT suitable for use with solid-state speed control. They already have speed control built into the motor electronics.

ARC FLASH AND ELECTRIC SHOCK HAZARD
Arc flash and electric shock hazard. Disconnect all electric power supplies, verify with a voltmeter that electric power is off, and wear protective equipment per NFPA 70E before working within the electric control enclosure. Failure to comply can cause serious injury or death. The customer must provide earth ground to the unit, per NEC, CEC, and local codes, as applicable. Before proceeding with installation, read all instructions, verify that all the parts are included, and check the nameplate to be sure the voltage matches available utility power. 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 volt meter. Refer to the unit electrical schematic. Follow all local codes.

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.

RISK OF INJURY OR DAMAGE.

• Motor may have a manual reset thermal protector. Disconnect power before servicing or resetting the motor thermal protector. Use caution, motor may be hot. Allow the motor to cool before resetting the thermal protector.
• If the motor thermal protector tripped, correct the issue that caused the motor to overheat (e.g. over motor rated amper-age or locked rotor).
• If the motor has a manual reset thermal protector, the red thermal protector reset button is located on the motor body, on or near the lead end of the motor. If the button does not reset, the motor may still be too hot. Allow the motor to fully cool to reset the  thermal protector, you should feel or hear a click when the thermal protector resets while pushing the reset button.

CAUTION

RISK OF CONTACT WITH HIGH-SPEED MOVING PARTS Disconnect all local and remote power supplies, verify with a voltmeter that electric power is off and all fan blades have stopped rotating before working on the unit. Do not operate this unit with any cabinet panels removed.

READ AND SAVE THIS MANUAL/LIRE ET CONSERVER CE MANUEL

NOTICE
This manual contains space for maintaining written records of unit maintenance and/or repairs. See Section 7.7 Maintenance Records. At the time the ERV is commissioned, a maintenance schedule should be developed by the user to incorporate monthly and seasonal maintenance and include start-up maintenance tasks as described in this manual.

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 Option Code.
• 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.

CONFIGURATION CODE

NOTE: Not all options are available on every model.

NOTES

• Digit 6 “J” = G5 Core Type. Digits 10, 16, and 17 are not used in these models.
• Digit 18: For units with the Bypass Option, the face damper also acts as an isolation damper in the EA or RA airstream.

OVERVIEW

DESCRIPTION
The HE1.5XRT Energy Recovery Ventilator is a device for recovering both sensible energy (heat) and latent energy (moisture) from the Exhaust Air from an Occupied Space and injecting those energies into an incoming Outside Airstream. It accomplishes this task by forcing the two airstreams through enthalpic cores, where the energy exchange takes place. The two airstreams pass through the enthalpic cores at right angles and the airstreams never mix together. See Section 2.2 Enthalpic Cores in this manual. Each ERV has two electric blowers, one for each airstream. Fan speeds can be either single speed, or they can be variable speed, controlled by VFDs, a RenewAire Commercial Controller or by a BMS. There are a number of different control devices available to control the operation or speed of the unit fans. For further information on available control accessories, see the HE RenewAire catalog. There are two types of HE1.5X units, one for indoor installations and one for rooftop, or outdoor, installation. This manual is for the HE1.5XRT, which is the outdoor unit. For information on the indoor version of this product, see the HE1.5XIN Installation and Operation Manual. HE1.5XRT units are designed to be installed outdoors, mounted on either a factory-supplied curb or on owner-supplied rails. These ERVs are commonly installed as part of an air handling system that provides heating and cooling of Supply Air. They can also be installed to operate as stand-alone devices when ducted directly to and from the Occupied Space. Each unit has an integral 24 VAC power supply that is used internally and can also be used as a power source for other optional control devices. The HE1.5XRT units are low-maintenance, requiring periodic replacement of the air filters and annual vacuuming of the enthalpic cores. See Section 7.0 Unit Maintenance in this manual.

IMPORTANT

It is important to understand and use the equipment airstream terminology as it is used in this manual. The airstreams are defined as:

• OUTSIDE AIR (OA): Air taken from the external atmosphere and, therefore, not previously circu-lated through the system.
• SUPPLY AIR (SA): Air that is downstream of the enthalpic cores and is ready for conditioning or for return to the Occupied Space.
• RETURN AIR (RA): Air that is returned to the ERV from a conditioned space.
• EXHAUST AIR (EA): Air that is removed from a heating or cooling appliance or from the Occu-pied Space and discharged.

NOTE: This unit is an Energy Recovery Ventilator, or ERV. It is commonly referred to throughout this manual as an ERV.

AIRFLOW
There are four different airflow options for the HE1.5XRT. They are:

• HE1.5XRTV
• HE1.5XRTR
• HE1.5XRTF
• HE1.5XRTH

All four configurations include attached hoods for the OA and EA airstreams. The airflow configuration is indicated by digit 9 of the Configuration Code.

COMPONENT DESCRIPTIONS

CABINET
The cabinet for the HE1.5XRT is made of 20 gauge galvanized steel and has 1″ thick high-density, foil-backed insulation on the inside. Units are available in either single-wall or double-wall construction. Doors are hinged and are fitted with stainless steel machine screws through the faces to prevent accidental opening of the doors when the unit is in operation. Doors may be completely removed by removing the hinge pins. All units are equipped with adjustable-height leveling legs for purposes of leveling the unit. Duct flanges are provided at all four airstream openings for connection of field- supplied ductwork.

ENTHALPIC CORES
All HE1.5XRT ERVs use a static-plate enthalpic core. The enthalpic cores transfer both latent and sensible energies between the airstreams. Gasketing is pre-installed on the cores and must be positioned to provide a proper air seal. For information on annual maintenance of the cores, see Section 7.0 Maintenance in this manual.

FAN/MOTOR ASSEMBLIES
There are two fan and motor assemblies in each ERV.

E-BOX
Every HE1.5XRT is equipped with what is known as an “E-Box.” High-voltage supply wiring and low-voltage control wiring is all terminated here. If optional integrated programmable controls are installed, an additional 24 VAC transformer is installed here to power both the controller and its dedicated sensors.

CAUTION Low airflow can cause fouling of the enthalpic cores. The ERV must never be operated without clean filters in place and minimum airflow must be greater than 250 CFM per full-sized core.

FILTERS

All HE1.5XRT units come equipped with four MERV 8 pleated filters. MERV 13 filters can be ordered as an accessory and are shipped loose.

• (2) 14″ x 20″ x 2″ and (2) 16″ x 20″ x 2″ (nominal) pleated filters. Actual size: 13.5″ x 19.5″ x 1.75″ and 15.6″ x 19.5″ x 1.75″
• Optionally, (4) 15″ x 20″ x 2″ (nominal) pleated filters. Actual size: 14.5″ x 19.5″ x 1.75″
• Minimum recommended effectiveness: MERV 6

FACTORY INSTALLED OPTIONS

• All HE1.5XRT units can be ordered with factory-installed options. See Unit Configuration Code on page 10.
• Options will have supplemental manuals shipped with the unit.
• For EC Motor option, see EC Motor Supplemental Manual.
• For Commercial Controls, see Commercial Controls, Supplemental Manual.
• For Filter Alarm, see Filter Alarm, Supplemental Manual.
• For Isolation Dampers, see Isolation Dampers Supplemental Manual.
• For Variable Frequency Drives, see the VFD Supplemental Manual.

SHIPPING/RECEIVING/HANDLING

HE1.5XRT units are palletized at the factory and then shipped by a common carrier. Upon receipt by the installer, the shipment should be inspected for shipping damage, before unloading. Any discovered shipping damage should be immediately reported to the RenewAire sales rep and the damage must be recorded on the Bill Of Lading, before signing for acceptance of the shipment. The unit can be handled with a forklift or a crane. Before moving the unit, verify that all latches and securing bolts on the cabinet doors are tightly fastened. If a crane is used for moving the HE1.5XRT unit, unscrew the sheet metal plates that hold the adjustable legs to the pallet. Use two hoisting slings and a spreader bar to hoist the unit. The hoisting slings must be positioned around the ends of the unit so they do not touch the unit doors. Unit hoisting weights and Center of Gravity are detailed in Sections 3.1 and 3.2 in this manual. Perform a test lift to make sure the unit is being hoisted level and is secure. Place the HE1.5XRT unit on a flat surface where it will be protected from the weather and incidental damage. Do not remove protective coverings from any duct openings and keep the doors secured and tightly closed.

UNIT WEIGHTS AND DIMENSIONS

1. Unit Dimensions and Weight:
   • 86″ L x 33 1/4″ W x 56 1/4″ H  387-548 lbs., varies by option(s)
2. 3.1.2 Maximum Shipping Dimensions and Weight:
   • 70″ L x 47″ W x 83″ H  615 lbs.

RIGGING AND CENTER OF GRAVITY
HE1.5XRT Hoisting Weights and COG There are pairs of rigging holes at each lower corner of the unit. Use slings or shackles at all four corners. Spreader bars are recommended in order to avoid damage to the unit.

RECEIVING
Upon receipt of the HE1.5XRT, inspect the unit for obvious external damage. If damage is observed, take digital pictures and report the damage to your RenewAire representative. Note the damage on the carrier’s Bill of Lading. Depending on expected transport and storage conditions, the unit may have only the duct openings covered, it may be stretch-wrapped or it may be created. Do not unwrap the unit at this time. The unit will normally be moved to its final location while still wrapped and attached to its pallet. The preferred method of hoisting the HE1.5XRT from the carrier truck is by using a construction forklift or a crane. Once the unit is unwrapped, prevent dirt and debris from entering the cabinet by covering any duct openings that do not have attached dampers. Keep the duct openings covered until it’s time to connect the ductwork.

STORAGE
Units that must be stored prior to installation should be left on their pallets and protected from weather and physical damage. Units must be placed on a level surface to prevent wracking of the pallet and the HE1.5XRT. All access doors must be secured with all available hardware (door latches and securing bolts) and all openings into the cabinet must be sealed to prevent the entry of dust, dirt, and debris.

UNIT PLACEMENT

BEFORE YOU BEGIN
The HE1.5XRT is designed for installation outdoors, typically on a rooftop. The preferred mounting method is to place the ERV on an optional manufactured curb, designed for the specific unit. RenewAire recommends the use of optional curb clips to provide substantial resistance to wind damage. For all installations, maintain needed service clearances as shown on the dimensioned drawings located in Section 4.2 of this manual. The curb should be placed on the completed roof decking and located so that the entire perimeter of the curb rests directly on or above structural steel roof supports.

SERVICE CLEARANCES

CAUTION

It is the installer’s responsibility to make sure that the screws or bolts used for securing the units are properly selected for the loads and substrates involved. Secure the HE1.5XRT so that it cannot fall or tip in the event of accident, structural failure or earthquake. See Rigging Information for unit weight. RenewAire strongly recommends that you secure rooftop units properly to the building structure. Strong winds, tornadoes, and hurricanes can and do displace or remove rooftop equipment from rails or curbs. When this happens, the equipment, adjacent roof structure, and even vehicles parked near the building can be damaged, and rain typically enters the building. The equipment is put out of service and the collateral damage can be very expensive.

SOUND ATTENUATION
Take these simple steps to attenuate noise from the unit.

Outside the Building
The exhaust hood is the primary source of noise outside the building. When practical, orient the exhaust air hood to point away from houses or public areas.

At the Curb
Cut the holes in the roof deck to fit closely around the duct(s) passing through the roof deck. Seal all gaps around the duct(s) at the roof deck.

Radiated Noise
The HE1.5XRT is insulated with high-density fiberglass. This provides significant attenuation of radiated sound from the unit itself. The outlet ducts can be significant sources of radiated sound as well. The SA duct should be insulated for sound control. This insulation should start at the unit. At a minimum the first 10′ of duct should be insulated. All parts of the SA and RA ducts located in a mechanical space with noise-generating equipment also should be insulated for sound control, both to minimize sound radiation out of the SA duct, and also to control sound radiation into both ducts.

Ducts
Make sure the ductwork at the unit outlets is stiff enough to resist the flexure and resulting booming associated with system start up and shut-off, as well as the turbulent flow conditions at the blower outlets. In general, provide smooth transitions from the ERV’s outlets to the duct. The ducts connecting  to the outlets should be straight for a sufficient distance, with gradual transitions to the final duct size. These guidelines are consistent with SMACNA recommended duct layout practices for efficient and quiet air movement. Follow SMACNA guidelines.

Connecting Horizontal Ducts to Unit
Flanged duct connections are provided on the horizontal duct connections of the HE1.5XRTR, RTF, and RTH units. These allow for connection of ducts insulated on the inside or the outside, or for installation of lined duct. Please refer to dimension drawings for duct flange sizes.

INSTALLATION

CURB SPECIFICATIONS
For all rooftop curbs, the curb is to be placed in a location specified by the Architect/Engineer as being capable of supporting all known loads. Curbs are to be installed using Industry Best Practices. For installation guidelines, see the current National Roofing Contractors Association (NRCA) manuals. For metal roofs that are supported by structural steel, the supporting structural steel must be located so that it supports the entire perimeter of the curb. Ideally, the curb will be placed directly on the structural steel and the metal roof decking is to be fitted around the curb. It is acceptable to place the metal roof decking on the structural steel and then place the curb on top of the metal roof decking. When this is done, wood fillers must be installed in the decking corrugations to provide complete support for the curb bottom flanges.

In all cases, all four bottom flanges of the curb must bear directly on or over the structural steel roof supports. For pre-stressed concrete roofs, the location of the curb must be approved by an engineer as being capable of supporting all known loads. Curbs are shipped knocked down and include all necessary assembly hardware, including foam gasketing tape. To assemble the curb, assemble the four sides of the curb with the provided hardware, but leave the hardware loose. When the four curb sides are assembled, install the provided mid-rails within the curb walls and then tighten all fasteners. See Dimension Drawings on pages 5 and 6 for curb dimensions. Curb clips are available as an optional accessory and can be installed as needed. Install foam gasketing (provided) on all bearing surfaces on the curb. Optional installation of owner-provided rails (HE1.5XRTH only): RenewAire recommends that all HE1.5XRT units be installed on a RenewAire-supplied curb that is manufactured to match individual units. The only unit that may be installed on owner-supplied mounting rails is the HE1.5XRTH. When owner-supplied mounting rails are used, RenewAire cannot provide installation instructions and it is the responsibility of the installer to verify compliance with all local building codes and structural integrity of the installation. Any such installation on owner-provided rails must be reviewed and approved by an engineer.

DUCTWORK
Basic Requirements:
Always connect an RA and an SA duct to each Rooftop unit.

• With Rooftop units, the RA and SA ducts cannot be interchanged.
• With RTV units, both ducts are inside the building. In other units, such as the RTR, RTF and RTH, at least one of the ducts is outside and must be weatherized.
• Any weatherized duct must be thermally insulated to prevent condensation on the inside or outside of the duct. The duct lining must be vapor-sealed, and the duct exterior must be rain tight. Duct(s) connected to the bottom of the HE1.5XRT are generally installed at this time. Install (2) ducts with HE1.5XRTV, (1) duct with HE1.5XRTR or RTF.

Drop duct(s) into openings in top of roof curb. Install appropriate gasket on top of Roof Curb and edges of ducts.

Inside Ductwork System
Follow Engineer’s Ductwork Design; Ductwork should be designed by an engineer to allow the unit to provide the required airflow.

NOTE: Ducts inside a building that are connected to the outside must be insulated with a sealed vapor barrier on both the inside and the outside of the insulation.

CAUTION
Tape both inner and outer vapor barriers of insulated duct to collars on duct adapters. This is critical to prevent migration of moisture into insulation. The build-up of moisture can result in failure of the duct system and/or frost in the insula-tion. Make sure any tears in the inner and outer vapor barriers are sealed.

Duct Insulation
If the inside ducts run through unconditioned spaces, they must be insulated, with a sealed vapor barrier on both the inside and outside of the insulation.

Use Dampers to Set and Balance Airflow Rates
In most applications, the airflow rate for both the Supply Air and the Exhaust Air should be roughly equal (or “balanced”) for the best performance of the HE1.5XRT Unit. See the unit specification sheet for CFM/ESP curves for available horsepower motors.

INSTALLATION OF HOODS
Rooftop units (RT models) have weather hoods that are assembled at the factory and shipped on a separate pallet or on top of the unit for field installation. See instructions/figures below. Installation of the hoods is normally performed after all rigging and hoisting is completed because of the chance of damage to the hoods by the rigging equipment. All weather hoods have a flange on the top rear that must be inserted behind the roof panel overhang. To install any hood, remove the factory-installed roof edge screws and keep them for reuse.

Outside Air Hood
Remove and save the screws in the roof panel overhang above the EA hood.

Slip the top flange of the OA hood assembly under the roof panel overhang to flash the hood assembly from precipitation. You may need to pry the roof panel overhang away from the unit side pan to get the hood assembly top flange under that roof panel overhang. Align the side screw holes on the hood assembly with the holes in the unit side pan and attach the hood assembly with screws (provided). Replace the self-tapping screws that were removed from the roof panel overhang above the hood.

Exhaust Air Hood
Remove and save the screws in the roof panel overhang above the EA hood.

Slip the top flange of the EA hood assembly under the roof panel overhang to flash the hood assembly from precipitation. You may need to pry the roof panel overhang away from the unit side pan to get the hood assembly top flange under that roof panel overhang. Align the side and  bottom edge screw holes on the hood assembly with the holes in the unit side pan and attach the hood assembly with screws (provided). Replace the self-tapping screws that were removed from the roof panel overhang above the hood.

ELECTRICAL REQUIREMENTS
Electrical Options and Ratings are identified on the Unit Label (located near electrical box). Find the complete Unit Model Number in the lower left corner of the Unit Label.

CAUTION
Before bringing power to the unit check unit nameplate to confirm it matches the voltage and phase of the power you are supplying. Remember that your field connections need to be accessi-ble for inspection.

Factory-Recommended Electric Service Entry
Knockouts are provided in the bottom of the E-box for entry of high-voltage power supply wiring. Install the wiring in accordance with local codes and provide strain relief at the E-box opening. Wiring is then terminated on the top of the disconnect switch. Low-voltage control wiring is to enter the E-box through the knockout in the bottom of the E-box. Provide strain relief as needed. High-voltage supply wiring is to be connected on the top side of the disconnect switch. See image below.

• NOTE: If your unit is equipped with EC Motors, please refer to “EC Motor Supplemental Manual” for more detail. Use conduit, strain reliefs, etc. as required by code to secure the field wiring.
• NOTE: Standard HE1.5XRT with single phase original equipment motors are NOT suitable for use with solid state speed control.

Low Voltage Control System
This ERV is provided with a Class II 24 VAC power supply system that operates the unit’s contactor(s) for HE1.5XRT. The ERV’s 24 VAC Power Supply can also be used to power the externally-installed controls system: up to 8 VA of power is available. The unit’s power supply system includes isolation relay(s) so you can use external controls whose contact ratings are as low as 50 mA (1.2 VA). Also, it is possible to operate the isolation relays with 24 VAC power from an external source (with proper wiring connections). A built-in circuit- breaker prevents damage to the transformer and other low-voltage components in the event of a short-circuit or overload. In extreme cases, the transformer itself is designed to fail safely.

Specifications

• Nominal Output Voltage under load: 24 VAC
• Typical Output Voltage at no load: 29–31 V
• Minimum contact rating for connected control device: 50 mA (1.2 VA)
• Circuit Breaker Trip Point: 3 A

CAUTION

1. Connect only to components intended for use with 24 VAC power.
2. Do not undersize the low-voltage wires connected to this device. Observe the wire length and gauge limits indicated in this manual.
3. Do not overload this unit’s 24 VAC power supply system. Confirm that the power require-ments of devices you connect to this power supply system do not exceed 8 VA in total.
4. If an external source of 24 VAC power is used to control the unit, consult the wiring schematics and connect the external power only to the specified terminals in order to avoid damaging the unit or external controls. Connect only CLASS II power to the control terminals of this unit.
5. Unit is not equipped to receive analog signals (such as 1–10 vdc or 4–20 mA).

How to Reset the 24 VAC Circuit Breaker
If the transformer is subjected to an excessive load or a short circuit, the circuit breaker will trip to prevent the failure of the transformer. When it trips the circuit breaker’s button pops up. Shut off the primary-side power to the unit, and remove the excessive load or the short. The circuit breaker can be reset about fifteen seconds after it trips by pressing in the button.

Limits of Power Output
If limits on wire gauge and length are observed, you may connect control devices that draw up to 8 VA to the blue and red wires. More than one device can be connected as long as total steady-state load does not exceed 8 VA.

NOTICE
If primary-side voltage is 230 VAC, move black primary-side lead from transformer’s “208 V” terminal to the transform-er’s terminal marked “240 V” (“230 V” in some units). Do not move the black primary-side lead that is connected to the trans-former’s “COM” terminal.

CAUTION
Be careful if the external control system provides 24 VAC power at its control output: make sure blue and red leads are separately capped and not connected to any other wires.

WIRING SCHEMATICS

EXTERNAL CONTROL CONNECTIONS

Single 2-Wire Control, Unpowered
Use the schematic shown in Figure 5.6.0 if the control requires no power to operate and acts like a simple on/off switch. The control must not supply any power to the ERV unit.

• Install jumper (provided) between terminals 2 and 3.
• Connect the control’s contacts to terminals 1 and 4 to operate the ERV’s isolation relay.

Control on separate Power Supply, no power present at Control Output: Wire as shown for the Single 2-wire control.

NOTE: The simplified schematics below show only the relevant portions of the low-voltage control circuit in the ERV unit and representational external control approaches. See the complete unit schematics above.

CAUTION
Make sure the control provides no voltage or current at its output terminals.

Control Sending 24 VAC “On” Signal
Use the schematic shown in Figure 5.6.1 if a 24 VAC “On” signal is to be sent from an external power source to the ERV.

• Make sure jumper is NOT installed between Terminals 2 and 3. Now you safely can apply 24 VAC to Terminals 3 and 4 to operate the ERV’s isolation relay.

CAUTION
Supply only 24 VAC (not VDC) from a Class II Power Source.

Control System with two Non-Powered Relay Contacts:
ERVs with Independent Blower Control Only: Use Figure 5.6.2 if the external control system provides no voltage or current at its output contacts.

• Install jumper (provided) between terminals 2 and 3.
• Connect one side of each of the output contacts to Terminal 1.
• Connect the other side of the output contacts to the appropriate yellow leads: Terminal 4 for the “SA Blower,” and Terminal 5 for the “EA Blower.”

Control System Sending two 24 VAC “On” Signals (from an external power source) Use Figure 5.6.3 only if the ERV has Independent Blower Control:

• Make sure the jumper is NOT installed between Terminals 2 and 3. Now you safely can apply one of the 24 VAC signals to Terminals 3 and 4 to operate the ERV’s isolation relay for the Supply Air Blower. Apply the second 24 VAC signal to Terminals 3 and 5 to operate the ERV’s isolation relay for the Exhaust Blower (make sure the polarity of each wire connected to Terminal 3 is the same).

CAUTION
Supply only 24 VAC (not VDC) from a Class II Power Source.

Control Operating on Unit’s 24 VAC Power Supply
Use the schematic shown in Figure 5.6.4 if controls are operating on unit’s 24 VAC power supply.

• 24 VAC power is available at the Terminals 1 and 2.
• Install jumper (provided) between terminals 2 and 3.
• Connect the switched output of the Control to Terminal 4 to operate the ERV’s isolation relay.

CAUTION
External control system should not draw more than 8 VA.

Control on Separate Power Supply
Use this schematic only if no power is present at the control output terminals.

• Install jumper at terminals 2 and 3.
• Connect the Control’s Normally Open (N.O.) contacts to terminals 1 and 4. See Wiring Schematics. Control System on Separate Power Supply; Independent Blower Control Use this schematic only if no power is present at the controls output terminals.
• Install jumper at terminals 2 and 3.
• Connect one of the Control’s (N.O.) contacts to terminals 1 and 4 to operate the ERV’s isolation relay for the Outside Air (OA) Blower.
• Connect another of the Control’s (N.O.) contacts to terminals 1 and 5 to operate the isolation relay for the Exhaust Air (EA) Blower. See Wiring Schematics.

Control System Operating Isolation Dampers with End Switches
Use Isolation Dampers with electrically separate end switches. The end switches are used to separately control the ERV unit’s Isolation Relays. Also, specify the ERV with Independent Blower Control. This ensures that each damper is open before the respective blower starts up. Because the ERV’s Motor Starters will only be operating once the Dampers are open, the power draw of the Damper Actuators is allowed to be as much as 35 VA while opening (including power draw of the external control system, if any). However, the power draw of the fully-opened (stalled) Actuators (and external control system if any) must be less than 8 VA.

• NOTE: Any changes to unit low-voltage wiring should be made with the disconnect switch in the OFF position.
• NOTE: When installing temporary jumpers on the low-voltage terminal strip, use 18 gauge or larger wire.

QUICK-START FOR TESTING CORRECT 3PH WIRING
All units that run on 3 phase power should be test-run immediately after high voltage wiring connections are made. This will verify that the three phases are properly connected, that the dampers will open and close properly and the fans are working properly. For purposes of testing correct phase connections, the internal 24 VAC power supply will be used to power-up the fans and all external control devices will be disabled, when applicable.

FIELD CONVERSION OF OPENINGS

The HE1.5XRT is designed to allow field conversion of the Return Air (RA) and Supply Air (SA) unit openings. This means the RA motorized impeller subassembly can be moved to an adjacent side or base of the unit if that opening is preferred. The SA outlet opening can also be moved to an adjacent wall or base.

Before you start, plan the duct work layout. Determine which openings are to be converted.

• Turn off the disconnect switch on the unit. Make sure electrical power is shut off to the unit and disconnect switch.
• Open the access doors to the unit.
• Remove the core strap, filters, and energy exchanger cores from the unit.

To Field Convert the Inlet Opening

1. Disconnect the motor harness connector by the motor. Move the wire harness out of the way if necessary.
2. Support the impeller subassembly. Remove the eight ¼-20 bolts retaining the impeller subassembly plate to the side rails and front and back tabs.
3. Lift the entire impeller subassembly out of the unit and set it aside. Leave the rails in the unit.
4. Remove the patch pan from the desired opening.
5. Using the exposed sheet metal cutout, cut the insulation from the desired opening.
6. Seal the edges of the cut insulation to prevent erosion of the insulation edges and debris in the airstream.
7. Install the patch pan over the undesired opening.
8. Install the insulation in the undesired opening. Seal the insulation.
9. At this point, if the Supply Air (SA) outlet opening is to be converted, you will want to address it before proceeding with the RA inlet opening.
10. After converting the SA outlet opening proceed with the RA inlet opening.
11. Install the impeller subassembly into the new inlet opening and fasten it with eight ¼-20 bolts to retain to the side rails and front and back tabs. Make sure the motor harness connector is towards the front of the unit.
12. Connect the motor harness.
13. Tidy up any wire harnesses that were moved making sure motor wires are taut and away from the impeller blades.

NOTE: The RA patch pan may be on the underside of the base pan. Safely access the underside of the unit toremove the patch pan.

To Field Convert the Outlet Opening

1. Remove the patch pan from the desired opening.
2. Using the exposed sheet metal cutout, cut the insulation from the desired opening.
3. Seal the edges of the cut insulation to prevent erosion of the insulation edges and debris in the airstream.
4. Install the patch pan over the undesired opening.
5. Install the insulation in the undesired opening. Seal the insulation.
6. If the RA Inlet Opening is being converted return to Step 10 in the “To Field Convert Return Air (RA) Inlet Opening” instructions above.

NOTE: The SA patch pan may be on the underside of the base pan. Safely access the underside of the unit to remove the patch pan.

After completion of the field conversion:

• Clean out the interior of the unit to remove any debris.
• Install energy exchanger cores, filters, and core straps.

OPERATION

PRINCIPLE OF OPERATION
The HE1.5XRT has one basic purpose: to exhaust air from a structure and bring in fresh air from outside while transferring heating or cooling energy from the exhaust air to the fresh air. The HE1.5XRT is a very simple device, and will accomplish this purpose as long as the blower can move air through the enthalpic core.

PRE-STARTUP

Verify Voltages
Using a voltmeter, test the input voltages as supplied to the disconnect switch. Refer to Digit 13 of the unit Configuration Code to find the rated voltage. The supplied voltage must be within +/- 10% of the rated voltage.

Verify Transformer Wiring
Units with 230 VAC power sources are shipped with the transformer wired for 208 VAC. If the unit is receiving 230 VAC, make sure the black primary-side wire on the transformer’s 208 V terminal has been moved to the 230 V terminal.

Inspect Filters
Clean filters must be installed prior to fan start up.

Inspect Foam Gasketing
Inspect the gasketing to make sure there are no gaps allowing air movement around the cores or filters.

Inspect Fans
Prior to start-up and connecting ductwork, when the HE1.5 unit and fans are installed in the desired orientation, check the gap between wheel and inlet ring—it should be consistent all the way around. Spin the blower wheel vigorously to confirm it does not rub. If the inlet ring needs re-adjusting, loosen the 4 bolts and nuts holding the inlet ring and adjust it such that there is a consistent gap between the wheel and inlet ring.

Inspect and Clean the Cabinet Interior
During the construction and installation phases of a project, dust, dirt and debris will often accumulate inside a unit. Thoroughly clean the inside of the unit by vacuuming and/or wiping metal surfaces with a damp rag.

Inspect Ductwork Connections
Ducts attached to the ERV must be firmly attached, sealed and supported in accordance with installation instructions and SMACNA guidelines.

UNIT START UP

Fixed-Speed Units
Most fixed-speed units do not have any external controlling signals and only require turning on the disconnect switch, located on the E-Box. When the disconnect switch is turned ON, any dampers will first move into their correct operating positions and then power is suppled to the motor contactors, causing the fans to run. Some fixed-speed units are wired to receive an actuating signal from an external source. If there is an external actuating signal source, verify the type of signal and that it is wired according to the low- voltage wiring diagrams found in Section 5.6 of this manual. Turn on the disconnect switch and then turn ON the actuating device. After any dampers have moved into their correct positions, power is then applied to the motor contactors and the fans will begin running.

IMPORTANT
It is important to balance the airflows after the unit is operational and all ductwork has been installed. Balancing the airflows is typically required by state and/or local codes, and is often specified by the HVAC design engineer. Optimum efficiency of the enthalpic cores is achieved when the airstreams are properly balanced.

MEASURING AIRFLOW
Airflow should be occurring in both airstreams. Sometimes the easiest place to confirm that air is moving is at the weatherhoods. If exact airflow is critical, it may be desirable to permanently install flow measuring stations and manometers in the ductwork connected to the unit. These also can be used to determine when filters should be cleaned or changed.

Equipment Required

• A magnehelic gauge or another device capable of measuring 0–1.5 in. water of differential pressure.
• 2 pieces of natural rubber latex tubing, 1/8″ ID, 1/16″ Wall works the best.

Procedure

The individual differential static pressures (DSP) can be measured using the installed pressure ports located in the front of the units core access doors.

• To read the SCFM of Supply Air (SA) install the “high” pressure side (+) of your measuring device to the Outside Air (OA) port and the “low” pressure side (-) to the Supply Air (SA) port.
• To read SCFM of Return Air (RA) install the “high” pressure side (+) of your measuring device to the Return Air (RA) port and the “low” pressure side (-) to the Exhaust Air (EA) port.
• Use the reading displayed on your measurement device to cross-reference the CFM output using the conversion chart.

NOTE: ERV airflow are to be balanced after all ductwork is installed. Balancing of airflow is typically required by local or state building codes or by the HVAC design engineer.
NOTE: The tubing should extend in the pressure port approx. 1″.
NOTE: Make sure clean filters are installed before balancing airflow. Dirty or clogged filters reduce airflow through the unit.

NOTE: These ports have been carefully located on the unit as to give you the most accurate airflow measurement. Do not relocate pressure ports.

CAUTION
The proper operating airflow range for this model is 375–1400 CFM.

CCCC

HE1.5XRT| DP (H2O)| DSP| 0.10| 0.15| 0.20| 0.25| 0.30| 0.35| 0.40| 0.45| 0.50| 0.55| 0.60| 0.65| 0.70| 0.75| 0.80| 0.85
Supply Air (SA)| CFM| 335| 450| 555| 650| 745| 835| 920| 1005| 1085| 1165| 1240| 1315| 1385| 1460| 1530| –
Return Air (RA)| CFM| –| –| –| –| –| 300| 380| 475| 575| 685| 805| 935| 1070| 1220| 1375| 1535

Filter Pressure Drop

NOTE: Clean filter pressure drop is included in unit airflow performance tables.

NORMAL OPERATION

A wide variety of control schemes may be selected by the engineer, installer, or owner to meet the ventilation needs of the facility. These may include timer clocks, occupancy sensors, dehumidistats (for cool-weather operation), carbon dioxide sensors, and others. DDC systems may also control the unit. Most control schemes will operate the unit only when needed. Continuous operation is acceptable in virtually all conditions. Unit will not be damaged by continuous operation as long as airflow occurs. Blower motors may overheat if filters become completely blocked due to lack of maintenance. Motors are thermally protected. With continuous operation, some external frosting may occur in very cold weather (see Section 6.6).

OPERATION IN EXTREME COLD WEATHER

HE1.5XRT units are capable of operating without internal frosting at temperatures down to -10°F, with indoor humidity below 40%. The units can operate under more severe conditions occasionally with little or no impact on their performance. At lower humidities, they can operate  at still lower outside temperatures without freezing the enthalpic cores. Some condensation or even frost may form on the outside of the unit or drip off the cabinet during very cold conditions, especially if the unit runs continuously. Exterior condensation during extreme cold conditions can be reduced or prevented by periodically cycling the unit OFF for several minutes to allow the cabinet to warm up.

MAINTENANCE

RenewAire ERVs are built to operate with minimal maintenance. After unit commissioning, the primary areas of attention are the air filters and annual vacuuming of the enthalpic cores.

MAINTENANCE 24 HRS. AFTER START-UP
24 hours after unit start-up: u In new installations, check the air filters since they will often collect dust, dirt, and debris at the time of start-up.

MAINTENANCE 30 DAYS AFTER START UP
After 30 days of operation:

• Tighten all electrical connections.
• Check the air filters as part of the normal monthly maintenance.

MAINTENANCE SCHEDULE
Experience on the part of the service person is the most important issue in establishing a maintenance schedule. There will be times of the year when frequent inspection of the filters will be required, such as spring and summer when there may be pollen, dust, dirt or debris from budding trees and bushes that can clog the filters. Also see Section 7.7 Maintenance Records in this manual.

WARNING

• The danger of injury if unit starts unexpectedly. Switch power off at service disconnect. Lock-out/tagout the disconnect.
• The danger of Electrical Shock when servicing an installed unit.
• ALWAYS DISCONNECT THE POWER SOURCE BEFORE SERVICING! More than one disconnect switch may be required.
• Proper Wiring Size Selection and Wiring Installation are the Responsibility of the Electrical Contractor.

RISK OF INJURY OR DAMAGE.
The motor may have a manual reset thermal protector. Disconnect power before servicing or resetting motor thermal protector. Use caution, motor may be hot. Allow the motor to cool before resetting the thermal protector. If the motor thermal protector tripped, correct the issue that caused the motor to overheat (e.g. over motor rated amperage or locked rotor). If the motor has a manual reset thermal protector, the red thermal protector reset button is located on the motor body, on or near the lead end of the motor. If the button does not reset, the motor may still be too hot. Allow the motor to fully cool to reset the thermal protector, you should feel or hear a click when the thermal protector resets while pushing the reset button.

FILTERS
Inspection and replacement of air filters is the most frequent maintenance issue. For units that do not have filter air pressure differential sensors, filters must be visually inspected monthly, as a minimum. If a filter looks discolored or dirty, REPLACE IT! When installing new filters, DO NOT USE filter sprays. Residue from the filter spray could migrate to the enthalpic core media and  damage the cores. For units that have filter air pressure differential sensors, a dirty filter alarm will occur on the connected alarm or control device.  Filter cleanliness and replacement is the most important and frequent maintenance issue. Dirty filters will cause an immediate reduction in operating efficiency of the ERV. Normally, filters should be inspected and changed when they are dirty. Paper filters are not to be cleaned, they  are to be replaced. In general, if a filter looks dirty, replace it. The best indication of dirty filters is to check the  pressure drop across the filter banks with an optional filter monitor. If it is not possible to checkthe pressure drop, the rule of thumb would be to change the filters every two months.

FAN MOTOR
The motor needs no lubrication. If necessary vacuum clean the blower wheels at the same time you clean the face of the energy exchange element (annually).

ENTHALPIC CORE

CAUTION

• RISK OF DAMAGE TO ENTHALPIC CORES Whenever working within the ERV cabinet, protect the enthalpic cores from accidental damage. The core media is subject to damage from dropped tools or other foreign objects
• DO NOT WASH THE ENTHALPIC CORE. Keep it away from water or fire to avoid damaging it. Always handle the core carefully.

Enthalpic Core Maintenance
The enthalpic core media is a fibrous material that must be kept clean at all times. As a minimum, cores should be cleaned once per year.

• DO NOT WASH OR ALLOW THE ENTHALPIC CORES TO GET WET.
• DO NOT EXPOSE THE ENTHALPIC CORES TO HIGH HEAT OR FLAMES.
• DO NOT DIRECT COMPRESSED AIR AT THE CORE MEDIA.
• DO NOT REMOVE THE ENTHALPIC CORES FROM THE ERV UNLESS NECESSARY.
• USE CAUTION WHEN WORKING AROUND THE ENTHALPIC CORES. DO NOT DROP TOOLS OR OTHER OBJECTS ON THE CORES, DO NOT BUMP OR TWIST THE CORES.

To access enthalpic cores for cleaning, remove the air filters. To clean enthalpic cores, all exposed surfaces must be vacuumed with an attachment having long, soft bristles. The greatest buildup of dirt and dust will normally be on the leading 1–2 inches of the inlet side (closest to the air filters).

Enthalpic Core Removal
Before removing enthalpic cores, switch the main disconnect to OFF. Open the door to the Energy Recovery Module and simply pull the core straight out of its guides.

Enthalpic Core Replacement
Cores have foam gasketing on one end of each core. The core should be reinstalled so that the foam gasketing is toward the back of the ERV and the core label is facing toward the front. See Figure 7.8.0.

• When cores are removed from the ERV, they should be immediately protected from accidental damage, water, high heat or flames.

MAINTENANCE RECORDS

SERVICE PARTS

TROUBLESHOOTING

If problems occur with a RenewAire ERV, the primary resources for troubleshooting are the unit as-built wiring schematics and the Sequence Of Operation (SOO) for each control scheme.

FACTORY ASSISTANCE
In the unlikely event that you need assistance from the factory for a specific issue, make sure that you have the information called for in the Unit Information page at the front of this manual. The person you speak with at the factory will need that information to properly identify the unit.

To contact RenewAire Customer Service

• Call 800-627-4499
• Email: RenewAireSupport@RenewAire.com

About RenewAire
For over 40 years, RenewAire has been a pioneer in enhancing indoor air quality (IAQ) in commercial and residential buildings of every size. This is achieved while maximizing sustainability through our fifth-generation, static- plate, enthalpic-core Energy Recovery Ventilators (ERVs) that optimize energy efficiency, lower capital costs via load reduction and decrease operational expenses by minimizing equipment needs, resulting in significant energy savings. Our ERVs are competitively priced, simple to install, easy to use and maintain and have a quick payback. They also enjoy the industry’s best warranty with the lowest claims due to long-term reliability derived from innovative design practices, expert workmanship and Quick Response Manufacturing (QRM). As the pioneer of static-plate core technology in North America, RenewAire is the largest ERV producer in the USA. We’re committed to sustainable manufacturing and lessening our environmental footprint, and to that end our Waunakee, WI plant is 100% powered by wind turbines. The facility is also one of the few buildings worldwide to be LEED and Green Globes certified, as well as having achieved ENERGY STAR Building status. In 2010, RenewAire joined the Soler & Palau (S&P) Ventilation Group in order to provide direct access to the latest in energy-efficient air-moving technologies. For more information, visit: renewaire.com 201 Raemisch Road | Waunakee, WI | 53597 | 800.627.4499 | RenewAire.com

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