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1.800.627.4499
HE-Series Outdoor
ERV
INSTALLATION
5.6 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.
NOTE: When in-
stalling temporary
jumpers on the
low-voltage terminal strip,
use 18 gauge or larger
wire.
NOTE: Any changes
to unit low-voltage
wiring should be
made with the disconnect
switch in the OFF position.
5.5.8 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.
5.7 FIELD CONVERSION OF OPENINGS
The HE1.5XRT is designed to allow field conversion of the Return Air (RA) and Fresh Air (FA) 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 FA 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.
u
Turn off the disconnect switch on the unit. Make sure electrical power is shut off to the unit
and disconnect switch.
u
Open the access doors to the unit.
u
Remove the core strap, filters, and energy exchanger cores from the unit.
5.7.1 To Field Convert the Inlet Opening
1. Disconnect 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 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 having
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 Fresh Air (FA) outlet opening is to be converted, you will want to address
it before proceeding with the RA inlet opening.
10. After converting the FA outlet opening proceed with the RA inlet opening.
11. Install the impeller subassembly into the new inlet opening and fasten 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 to remove the
patch pan.
