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HE-Series Indoor
ERV
INSTALLATION
5.7 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: Any changes
to unit low-voltage
wiring should be
made with the disconnect
switch in the OFF position.
5.8 FIELD CONVERSION OF OPENINGS
The HE1.5XIN is designed to allow field conversion of the unit openings. This means the
motorized impeller sub-assemblies can be moved to an adjacent wall of the unit if that opening
is preferred. The outlet openings can also be moved to an adjacent wall.
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 (A) by the motor. Move the wire harness out of the way
if necessary.
2. Support the impeller subassembly. Remove the eight ¼-20 bolts (B) retaining the impeller
subassembly plate to the side rails and front and back tabs.
3. Lift the entire impeller subassembly (C) out of the unit and set aside. Leave the rails in the
unit.
4. Remove the patch pan (D) 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. Remove the duct flange from the undesired opening and install it at the desired opening.
10. If both inlet openings are to be converted, repeat Steps 2–9 for the second inlet opening.
11. At this point, if there are outlet openings for conversion, you will want to address them
before proceeding with the inlet opening.
12. After converting the outlet openings move the unit floor brackets (E), if necessary, so when
the unit is re-oriented the floor brackets support the unit on the floor.
13. Rotate the unit to the desired orientation, if necessary.
14. 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.
15. Connect the motor harness.
16. Repeat Steps 14–15 for other impeller subassembly if required.
17. Tidy up any wire harnesses that were moved making sure motor wires are taut and away
from the impeller blades.
