RenewAire HE1XRT Instruction manual

INSTALLATION, OPERATION & MAINTENANCE MANUAL
ENERGY RECOVERY VENTILATOR
INSTALLATION, OPERATION & MAINTENANCE MANUAL
ENER
G
Y RE
CO
VERY VENTILAT
OR
HE1XRT
WWW.RENEWAIRE.COM
MODEL: HE1XRT

ERV HE1XRT
WWW.RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.44992
ERV HE1XRT
WWW.RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.44992
HE1XRT info......................... 2-9
Installation....................... 10-18
Start-up............................19-21
Maintenance.....................22-23
TABLE OF CONTENTS
HE1XRT INFO
1. Before servicing or cleaning the unit, switch
power off at disconnect switch or service panel
and lockout/tag-out to prevent power from being
switched on accidentally. More than one discon-
nect switch may be required to de-energize the
equipment for servicing.
2. This installation manual shows the suggested
installation method. Additional measures may be
required by local codes and standards.
3. Installation work and electrical wiring must be
done by qualified professional(s) in accordance
with all applicable codes, standards and licens-
ing requirements.
4. Any structural alterations necessary for instal-
lation must comply with all applicable building,
health, and safety code requirements.
5. This unit must be grounded.
6. Danger of severe injury to bystanders and dam-
age to unit or property if high winds move this
unit. Secure this unit to the building!
7. Sufficient air is needed for proper combustion
and exhausting of gases through the flue (chim-
ney) of fuel burning equipment that might be in-
stalled in the area affected by this equipment. If
this unit is exhausting air from a space in which
chimney-vented fuel burning equipment is locat-
ed, take steps to assure that combustion air sup-
ply is not affected. Follow the heating equipment
manufacturer’s requirements and the combus-
tion air supply requirements of applicable codes
and standards.
8. Use the unit only in the manner intended by the
manufacturer. If you have questions, contact the
manufacturer.
9. This unit is intended for general ventilating only.
Do not use to exhaust hazardous or explosive
materials and vapors. Do not connect this unit to
range hoods, fume hoods or collection systems
for toxics.
10.When cutting or drilling into wall or ceiling, do
not damage electrical wiring and other hidden
utilities.
RISK OF FIRE, ELECTRIC SHOCK, OR INJURY. OBSERVE ALL CODES AND THE FOLLOWING:
WARNING
The unit’s fresh air inlet should be at least 10’ away from any exhaust, such as dryer vents, chimneys,
furnace and water heater exhausts, or other sources of contamination or carbon monoxide. Do not locate the
fresh air inlet where vehicles may be serviced or left idling. Never locate the unit inside a structure.
Danger of damage or severe injury if high winds move this unit. Secure unit to structure. Observe local code
requirements at a minimum.
WARNING

ERVHE1XRT
31.800.627.4499 INSTALLATION, OPERATION AND MAINTENANCE MANUAL WWW.RENEWAIRE.COM
WARNING
DANGER OF INJURY
OR DAMAGE.
The motors in this unit must not be
run at an amperage that exceeds
the motor’s rated full load amps.
It is the installer’s responsibility to
measure the operating amperage
of each motor. If the full load amp
rating is exceeded, the amp draw
must be reduced by reducing
airflow with an external damper.
Failure to make this adjustment
may result in unsafe motor
winding temperatures or tripping
of the supplied motor starter’s
overload relay motor protection
devices set at full load amps.
HE1XRT INFO
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.
Moteurs de trois phase ne convient pas pour utilisation
avec regulateur de vitesse electronique. Si la régulation
de vitesse est souhaité, utiliser l’option VDF.
Moteurs d’une phase de l’ECM ne conviennent pas pour
une utilisation avec regulateur de vitesse electronique.
Ils ont déjà le contrôle de vitesse intégré dans le moteur
électronique.
WARNING
Danger of Electrical Shock when servicing an installed unit.
ALWAYS DISCONNECT 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.
WARNING
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 pro-
tector, you should feel or hear a click when the ther-
mal protector resets while pushing the reset button.
WARNING
RISK OF INJURY OR DAMAGE. Danger of injury if unit starts
unexpectedly. Switch power off
at service disconnect. Lock-out/
tag-out the disconnect.
WARNING

ERV HE1XRT
WWW.RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.44994
HE1XRT INFO
HE1XRT CONFIGURATION CHART
MODEL NUMBER
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NOTE: RenewAire reserves the right to make changes in the design or specifications of products at any time without notice. Unless otherwise
specified, dimensions are rounded to the nearest eighth of an inch.

1.800.627.4499 INSTALLATION, OPERATION AND MAINTENANCE MANUAL WWW.RENEWAIRE.COM 5
SCC OS SOS
ROOFTOP UNIT SPECIFICATIONS
Ventilation Type:
Static plate, heat and humidity transfer
Typical Airflow Range: 250-870 CFM
AHRI 1060 Certified Core: One L125-G5
Standard Features:
Non-fused disconnect
24 VAC transformer/relay package
Filters:
Total qty. 2, MERV 8: 20" x 20" x 2"
Unit Dimensions & Weight:
81" L x 40 1/4" W x 44" H
243-346 lbs., varies by option(s)
Max. Shipping Dimensions & Weight (on pallet):
96" L x 47" W x 50" H
441 lbs.
Motor(s):
Qty. 2, 0.75 HP ea., Direct drive blower/standard
motor packages
Options:
Qty. 2, EC Motor (see HE1XRT EC Motor submittal) -
0.5 HP 120V/1Ph/60HZ,
0.5 HP 208-230V/1Ph/60HZ
Integrated programmable controls
Fused disconnect
Double wall construction
Factory supplied and mounted variable frequency
drives (VFDs) - one or both airstreams
Class 1 low leakage motorized isolation dampers -
OA, RA or both airstreams
Qty. 2, Factory mounted filter alarms
Independent blower control
Exterior paint - white, custom colors
Accessories:
Filters - MERV 13, 2" (shipped loose)
Backdraft damper 12"
Solid state speed control kit - 115V, Qty. 1,
208-230V, Qty. 1
Roof curb - standard 14"
Curb wind clip
Engineered combo curb for Trane RTU
Engineered combo curb for Carrier RTU
Digital time clock - wall mount (TC7D-W),
in exterior enclosure (TC7D-E)
Motion occupancy control - ceiling mount (MC-C),
wall mount (MC-W)
Carbon dioxide control - wall mount (CO2-W),
duct mount (CO2-D)
Electric duct heater - EK series (1–60 kW); designed
for indoor ductwork installation only
Indirect gas-fired duct furnace - GH series
(50-400 MBH), installed downstream of any fans
Standard Electrical Specifications Optional Factory Installed
VFD Electrical Specifications
HP Volts HZ Phase FLA
per motor
Min.
Cir.
Amps
Max.
Overcurrent
Protection
Device
FLA
per motor
Min.
Cir.
Amps
Max.
Overcurrent
Protection
Device
0.75 120 60 Single 9.0 20.3 25
0.75 208-230 60 Single 4.5 10.1 15
0.75 277 60 Single 3.9 8.8 15
0.75 208-230 60 Three 1.7-2.3 5.2 15 1.7-2.3 5.7 15
0.75 460 60 Three 1.15 2.6 15 1.15 2.8 15
ELECTRICAL DATA
30%
50%
70%
90%200 400 600 800 1000
Effectiveness (%)
Airflow (CFM)
CORE PERFORMANCE
At AHRI 1060 standard conditions.
See all AHRI certified ratings at www.ahrinet.org.
AIRFLOW PERFORMANCE
Motor HP
Phase
External Static Pressure (Inches Water Column)
0.0 0.5 1.0 1.25 1.45 1.75
0.75
Single Phase
950 CFM
1,630 Watts
820 CFM
1,475 Watts
730 CFM
1,385 Watts
650 CFM
1,300 Watts
560 CFM
1,220 Watts
250 CFM
1,080 Watts
0.75
Three Phase
950 CFM
1,430 Watts
820 CFM
1,255 Watts
730 CFM
1,155 Watts
650 CFM
1,060 Watts
560 CFM
955 Watts
250 CFM
685 Watts
Note: Watts is for the entire unit (2 motors).
Note: Airflow performance includes effect of clean, standard filter supplied with unit.
1XRTHE Energy Recovery Ventilator
Standard
Download specification at:
renewaire.com/specifications

WWW.RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.4499WWW.RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.44996
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HE1XRT (RTV/RTR) Energy Recovery Ventilator Standard or EC Motor Option
EA
AR
AF
OA
RTV
OA
A
R
EA
FA
RTR
AIRFLOW CONFIGURATION Available as shown:
UNIT MOUNTING & APPLICATION Must be mounted as shown. Airstreams can not be switched.

1.800.627.4499 INSTALLATION, OPERATION AND MAINTENANCE MANUAL WWW.RENEWAIRE.COM 7
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HE1XRT (RTH/RTF) Energy Recovery Ventilator Standard or EC Motor Option
AIRFLOW CONFIGURATION Available as shown:
UNIT MOUNTING & APPLICATION Must be mounted as shown. Airstreams can not be switched.
A
F
OA
EA
RA
RTF
OA RA
EA
FA
OA
RTH

ERV HE1XRT
WWW.RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.44998
HE1XRT INFO
CONFIGURATIONS The HE1XRT is available from the factory in four different configurations to meet different connection
requirements:
OPTION CODE DESCRIPTION OF
DUCT CONNECTION CONFIGURATION MOUNTING OPTION
HE1XRTV Room Air [RA] enters bottom of unit.
Fresh Air [FA] exits bottom of unit. Roof Curb
HE1XRTR Room Air [RA] enters bottom of unit.
Fresh Air [FA] exits side of unit. Roof Curb
HE1XRTF Room Air [RA] enters side of unit.
Fresh Air [FA] exits bottom of unit. Roof Curb
HE1XRTH Room Air [RA] enters side of unit.
Fresh Air [FA] exits side of unit. Equipment Rail
STANDARD CONFIGURATION
RA = Room Air into Unit
OA = Outside Air into Unit
FA = Fresh Air to Inside
EA = Exhaust Air to Outside
HE1XRTR
HE1XRTV
HE1XRTF HE1XRTH
EA
AR
AF
OA
RTV
OA
AR
EA
FA
RTR
AF
OA EA
RA
RTF
OA
RA
EA
FA
OA
RTH

ERVHE1XRT
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HE1XRT INFO
NOTES
THIS PAGE LEFT BLANK

ERV HE1XRT
WWW.RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.449910
PLACEMENT OF THE HE1XRT
The HE1XRT is designed for installation on a roof or other outside location. Select a location that is central
to the inside duct runs, and close to any other air handler that might be part of the system.
PLANNING
YOUR INSTALLATION
INSTALLATION
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F1
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 HE1XRT so that it cannot fall
or tip in the event of accident, structural failure or
earthquake.SeeRiggingInformationforunitweight.
RenewAire strongly recommends that you secure
rooftop units properly to the building structure.
Strong winds, tornados, 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.
Provide Adequate Service Access for Maintenance.
The HE1XRT will require regular filter and core
inspections. Install the HE1XRT where you can
open the doors for cleaning the core and replacing
the filters, and where you can get at the wiring for
installation and service.
CAUTION
CAUTION
Provide service access to the unit to allow for cleaning the core and filter.

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55/5
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RIGGING
INFORMATION
There are pairs of rigging holes at each upper corner of the unit. Use slings or shackles at all four
corners. Spreader bars are recommended in order to avoid damage to the unit.
CURB
SPECIFICATIONS
F2
INSTALLATION
F3
Indicates locations at
which corner weights
are calculated: along
centers of curbs rails.
HE1XRT UNIT CORNER WEIGHTS (LBS)
HE1XRT UNIT CORNER WEIGHTS (LBS)
SINGLE-WALL
PHASE UNIT LF LR RR RF
1-PHASE 243 67 63 55 58
3-PHASE 250 70 66 55 59
DOUBLE-WALL
PHASE UNIT LF LR RR RF
1-PHASE 303 86 73 66 78
3-PHASE 310 89 76 67 78
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ERV HE1XRT
WWW.RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.449912
INSTALLATION
GENERAL PRACTICES
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.
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.
RADIATED NOISE
The HE1XRT 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 FA duct should be
insulated for sound control. This insulation should
start at the unit. At a minimum the first ten feet of
duct should be insulated. All parts of the FA 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 FA duct, and also to control sound radiation
into both ducts.
AERODYNAMIC (VELOCITY) NOISE
When sound attenuation is a design concern, the
primary consideration is velocity noise at the unit’s
Fresh Air blower outlet. The average velocity at the
Fresh Air blower outlet is 2482 FPM when the unit
is operating at 750 CFM. The average velocity at
the Exhaust Hood outlet is 1029 FPM when the unit
is operating at 750 CFM.
PLANNING
YOUR INSTALLATION
To avoid motor bearing damage
and noisy and/or unbalanced
impellers, keep drywall spray,
construction dust, etc., out of unit.
CAUTION
1. Before servicing or cleaning the unit, switch
power off at disconnect switch or service panel
and lockout/tag-out to prevent power from being
switched on accidentally. More than one discon-
nect switch may be required to de-energize the
equipment for servicing.
2. This installation manual shows the suggested
installation method. Additional measures may be
required by local codes and standards.
3. Installation work and electrical wiring must be
done by qualified professional(s) in accordance
with all applicable codes, standards and licens-
ing requirements.
4. Any structural alterations necessary for instal-
lation must comply with all applicable building,
health, and safety code requirements.
5. This unit must be grounded.
6. Danger of severe injury to bystanders and dam-
age to unit or property if high winds move this
unit. Secure this unit to the building!
7. Sufficient air is needed for proper combustion
and exhausting of gases through the flue (chim-
ney) of fuel burning equipment that might be in-
stalled in the area affected by this equipment. If
this unit is exhausting air from a space in which
chimney-vented fuel burning equipment is locat-
ed, take steps to assure that combustion air sup-
ply is not affected. Follow the heating equipment
manufacturer’s requirements and the combus-
tion air supply requirements of applicable codes
and standards.
8. Use the unit only in the manner intended by the
manufacturer. If you have questions, contact the
manufacturer.
9. This unit is intended for general ventilating only.
Do not use to exhaust hazardous or explosive
materials and vapors. Do not connect this unit to
range hoods, fume hoods or collection systems
for toxics.
10.When cutting or drilling into wall or ceiling, do
not damage electrical wiring and other hidden
utilities.
RISK OF FIRE, ELECTRIC SHOCK, OR INJURY. OBSERVE ALL CODES AND THE FOLLOWING:
WARNING
Do not remove or disable the
wiring interconnection between
the Overload Relays and the
Contactors. Without this inter-
connection the motor(s) will not
be protected against overload.
CAUTION
SOUND
ATTENUATION

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INSTALLATION
PLANNING
YOUR INSTALLATION
CONNECTING HORIZONTAL DUCTS TO UNIT
Double-flanged duct connections are provided on the horizontal duct connections of the HE1XRTR,
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.
INSIDE DUCTWORK SYSTEM
Follow Engineer’s Ductwork Design
Ductwork should be designed by an engineer
to allow the unit to provide the required airflow.
Duct Insulation
If the inside ducts run through un-conditioned
spaces, they must be insulated, with a sealed
vapor barrier on both inside and outside of
insulation.
Use Dampers to Set and Balance Airflow Rates
In most applications, the airflow rate for both the
Fresh Air and the Exhaust Air should be roughly
equal (or “balanced”) for best performance of the
HE1XRT Unit. See unit specification sheet for CFM/
ESP curves for available horsepower motors.
APPLICATIONS
See figure F4 for examples of some common installation approaches.
The unit’s fresh air inlet should be at least 10’ away from any exhaust, such as dryer vents, chimneys,
furnace and water heater exhausts, or other sources of contamination or carbon monoxide. Do not locate the
fresh air inlet where vehicles may be serviced or left idling. Never locate the unit inside a structure.
Danger of damage or severe injury if high winds move this unit. Secure unit to structure. Observe local code
requirements at a minimum.
WARNING
F4Common Installation Approaches

ERV HE1XRT
WWW.RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.449914
INSTALLATION
INSTALLATION INSTRUCTIONS
DUCTING
MOUNTING THE UNIT - ON ROOF CURBS
The base of the HE1XRT is designed for installation
on typical Roof Curbs that come with 1½” wide
wood nailers on the top edge. See figure 3 in Plan-
ning Your Installation for appropriate curb size.
Set HE1XRT in place. We recommend bolting
through sides of unit base into the Roof Curb to
secure the unit against high winds.
ON EQUIPMENT RAILS (HE1XRTH ONLY)
Review drawing of Roof Curb and specify
Equipment Rail to fit. Before installing HE1XRT,
apply roofing and counterflashing to Equipment
Rails as per standard practice.
Set HE1XRT in place. We recommend bolting
through sides of unit base into the Equipment
Rails to secure the unit against high winds.
BASIC REQUIREMENTS
Always connect an RA and an FA duct to each
Rooftop unit.
• With Rooftop units, the RA and FA ducts cannot
be interchanged.
• With RTV units, both ducts are inside the build-
ing. In other units, such as the RTR/RTF and
RTC/RTH, that utilize the optional roof adapter,
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 HE1XRT are generally installed at this time.
Install (2) ducts with HE1XRTV, (1) duct with
HE1XRTR or RTF.
Drop duct(s) into openings in top of roof curb.
Install appropriate gasket on top of Roof Curb
and edges of ducts.
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 accessible for inspection.
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. Build-
up of moisture can result in failure of the duct system
and/or frost in the insulation. Make sure any tears in
the inner and outer vapor barriers are sealed.
CAUTION
CAUTION
ELECTRICAL SPECIFICATIONS
NOTE: If your unit is equipped with ECM Motors,
please refer to “ECM Motor Manual Supplement for
RenewAire Light Commercial Units” for more detail.
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.

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INSTALLATION
WIRING SCHEMATICS
HE1XRT P1 AND P3 IBC WIRING SCHEMATICS WITH INDEPENDENT BLOWER CONTROL
HE1XRT P1 AND P3 WIRING SCHEMATICS - STANDARD
NOTE: Schematics
shown are representative
of standard units. See
Unit Schematic label for
detailed information.

ERV HE1XRT
WWW.RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.449916
INSTALLATION INSTRUCTION
INSTALLATION
HOW TO RESET THE 24VAC 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 break-
er can be reset about fifteen seconds after it trips
by pressing in the button.
NOTE: INSTALLING CONTRACTOR
If primary-side voltage is 230VAC, move black
primary-side lead from transformer’s “208V”
terminal to the transformer’s terminal marked
“240V” (“230V” in some units).
Do not move the black primary-side lead that is
connected to the transformer’s “COM” terminal
Limits of Power Output
If limits on wire gauge and length are observed,
you may connect control devices that draw up
to 8VA to the blue and red wires. More than
one device can be connected as long as total
steadystate load does not exceed 8VA.
LOW VOLTAGE CONTROL SYSTEM
This ERV is provided with a Class II 24VAC power
supply system that operates the unit’s contactor(s)
for HE1XRT. The ERV’s 24VAC Power Supply can
also be used to power the externally-installed con-
trols system: up to 8VA 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 50mA (1.2VA). Also,
it is possible to operate the isolation relays with
24VAC 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: 24VAC
•Typical Output Voltage at no load: 29-31V
•Minimum contact rating for connected control
device: (50mA (1.2VA)
•Circuit Breaker Trip Point: 3A
1. Connect only to components intended for use with 24VAC 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 24VAC power supply system. Confirm that the power requirements of devices
you connect to this power supply system do not exceed 8VA in total.
4. If an external source of 24VAC 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 1-10vdc or 4-20mA).
6. Unit is not equipped to communicate directly with Building Management Systems (such as BACNET,
LONWORKS, etc.). However, the unit can be controlled by powered or non-powered contacts operated by
any kind of control system.
CAUTION
If primary-side voltage is 230VAC,
move black primary-side lead from
transformer’s “208V” terminal to
the transformer’s terminal marked
“240V” (“230V” in some units).
Do not move the black primary-
side lead that is connected to the
transformer’s “COM” terminal.
INSTALLATION NOTES
OBSERVE THESE LIMITS TO WIRE LENGTH AND GAUGE
in order to ensure reliable operation of the control system.
Wire Gauge #22 #20 #18 #16 #14 #12
Circuit Length 100’ 150’ 250’ 400’ 700’ 1000’
“Circuit Length” is distance from ERV to Control Device.
WARNING
DANGER OF INJURY
OR DAMAGE.
The motors in this unit must not be
run at an amperage that exceeds
the motor’s rated full load amps.
It is the installer’s responsibility to
measure the operating amperage
of each motor. If the full load amp
rating is exceeded, the amp draw
must be reduced by reducing
airflow with an external damper.
Failure to make this adjustment
may result in unsafe motor
winding temperatures or tripping
of the supplied motor starter’s
overload relay motor protection
devices set at full load amps.

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INSTALLATION
CONTROL WIRING
SCHEMATICS
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 elsewhere in this manual.
CONTROL WIRING EXAMPLES BY TYPE OF APPLICATION
A. Single 2-wire Control: Use this schematic 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 (provid-
ed) between terminals 2 & 3. Connect the control’s contacts to terminals 1 & 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.
C. Control System with 2 Non-powered Relay Contacts: ERVs with Independent Blower Control Only:
Use this schematic if the external control system provides no voltage or current at its output contacts.
Install jumper (provided) between terminals 2 & 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 “FA Blower”, and Terminal 5 for the “EA Blower”.
B. Control Sending 24VAC “On” Signal (from an external power source) to ERV: Make sure jumper
is NOT installed between Terminals 2 & 3. Now you safely can apply 24VAC to the Terminals 3 & 4 to
operate the ERV’s isolation relay.
Be careful if the external control system provides
24VAC power at its control output: make sure
blue and red leads are separately capped and not
connected to any other wires.
CAUTION
AA SWITCH OR NON-POWERED CONTROL
USING UNIT’S 24VAC POWER SUPPLY
CA SWITCH OR NON-POWERED CONTROL
USING UNIT’S 24VAC POWER SUPPLY
B24VAC FROM AN EXTERNAL SOURCE
Make sure the control provides
no voltage or current at its output
terminals.
CAUTION
Supply only 24VAC (not VDC) from
a Class II Power Source.
CAUTION

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CONTROL WIRING
SCHEMATICS
E. Control operating on Unit’s 24VAC Power Supply: 24VAC power is available at the Terminals 1 & 2.
CAUTION: external control system should not draw more than 8VA. Install jumper (provided) between
terminals 2 & 3. Connect the switched output of the Control to Terminal 4 to operate the ERV’s isolation relay.
Supply only 24VAC (not VDC) from
a Class II Power Source.
CAUTION
D. Control System Sending two 24VAC “On” Signals (from an external power source): ERVs with
Independent Blower Control Only: Make sure the jumper is NOT installed between Terminals 2 & 3.
Now you safely can apply one of the 24VAC signals to Terminals 3 & 4 to operate the ERV’s isolation
relay for the Fresh Air Blower. Apply the second 24VAC signal to Terminals 3 & 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).
F. Control on separate Power Supply: Use this schematic only if no power is present at the controls
output terminals. Install jumper at terminals 2 & 3. Connect the Control’s Normally Open (N.O.)
contacts to terminals 1 & 4. NOTE: See Wiring Schematics.
G. 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 & 3. Connect one of
the Control’s (N.O.) contacts to terminals 1 & 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 & 5 to operate the isolation
relay for the Exhaust Air (EA) Blower. NOTE: See Wiring Schematics.
H. Control System Operating Isolation Dampers with End Switches: Use Isolation Dampers with elec-
trically 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. NOTE: 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
35VA 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 8VA.
DTWO EXTERNAL RELAY CONTACTS SUPPLYING
24VAC FROM AN EXTERNAL SOURCE
EAN EXTERNAL CONTROL USING UNITS
24VAC POWER SUPPLY
INSTALLATION

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START-UP
PRINCIPAL OF OPERATION
The HE1XRT 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 HE1XRT is a very simple device, and will
accomplish this purpose as long as the blowers
for both airstreams are able to move air through
the energy-exchange core.
CHECKING THAT UNIT IS OPERATING
Air Flow
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.
Use Static Taps in Doors to
Measure Airflow Rates
See “Cross-Core Static Drop” in MEASURING
AIRFLOW table. These may be used to directly
measure airflow in the unit.
Energy Exchange
Precise determination of installed sensible energy
exchange effectiveness requires careful measure-
ment of temperatures and air flows in all four air
streams, and in practice is somewhat difficult.
It is possible to confirm that energy is being
exchanged simply by feeling the ducts. If the Fresh
Air duct from the unit into the room is closer to
room temperature than to the outside temperature,
energy is being recovered.
Operating Controls
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 sen-
sors, and others. DDC systems may also control
the unit. Most control schemes will operate the
unit only when needed.
CONTINUOUS OPERATION
Continuous operation is acceptable in virtually all
conditions. Unit will not be damaged by continuous
operation as long as air flow 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 below).
OPERATION IN EXTREME COLD WEATHER
Unit is capable of operating at outside temperatures
down to -10°F, with indoor humidities below 40%,
without any internal frosting. Unit can operate at
more severe conditions occasionally with little or no
impact on its performance. At lower humidities, it
can operate at lower outside temperatures without
freezing the energy-exchange core.
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.
Moteurs de trois phase ne convient pas pour utilisation
avec regulateur de vitesse electronique. Si la régulation
de vitesse est souhaité, utiliser l’option VDF.
Moteurs d’une phase de l’ECM ne conviennent pas pour
une utilisation avec regulateur de vitesse electronique.
Ils ont déjà le contrôle de vitesse intégré dans le moteur
électronique.
NOTE: Standard HE1XRT with single phase original
equipment motors are suitable for use with solid
state speed control.
Le HE1XRT avec moteurs d’équipement d’origine
monophasés sont adaptés pour une utilisation avec
regulateur de vitesse electronique.
OPERATION
WARNING

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START-UP
START-UP
EQUIPMENT REQUIRED
•A magnehelic gauge or other device capable of
measuring 0 to 1.5 in. water of differential pressure.
•2 pieces of natural rubber latex tubing, 1/8” ID,
1/16” Wall works the best.
NOTE: Be sure to remove cap from pressure port
before inserting tubing. Insure tubing is well seated
in pressure ports.
NOTE: The tubing should extend in the pressure
port approx. 1 inch.
DIFFERENTIAL STATIC ACROSS CORE DSP VS. CFM
DIFFERENTIAL STATIC ACROSS CORE DSP VS. CFM
HE1XRT
DSP 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10
Fresh Air (FA) CFM 180 280 370 460 550 640 740 830 920 1010
Room Air (RA) CFM 170 250 330 410 500 580 660 740 830 910
The individual differential static pressures (DSP)
can be measured using the installed pressure ports
located in the front of the units core access doors.
NOTE: These ports have been carefully located on
the unit as to give you the most accurate airflow
measurement. Do not relocate pressure ports.
•To read SCFM of Fresh Air (FA) install the “high”
pressure side (+) of your measuring device to the
Outside Air (OA) port and the “low” pressure side
(-) to the Fresh Air (FA) port.
•To read SCFM of Room Air (RA) install the “high”
pressure side (+) of your measuring device to the
Room 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: Be sure to replace cap into pressure port
when air flow measuring is completed.
CROSS CORE STATIC PRESSURE MEASUREMENT INSTRUCTIONS
EA
RTH, RTF
ONLY
RA
RTV, RTR
ONLY
RA
RTV, RTF
ONLY
FA
OA
FA
RTH, RTR
ONLY
Pressure
3RUWV(4)
from back
of unit
The proper operating airflow range
for this model is 250 - 870 CFM.
CAUTION
F5MEASURING AIRFLOW