Frost Control - Greenheck ERCH-20 Installation, Operation And Maintenance Manual

Stop Wheel
1. Navigate to the Checkout menu and press
2. The energy wheel and cooling should stop.
3. Navigate to Connect ERV and press
to run the test.
4. Voltage between AUX1-O and C should be 24 VAC.
The energy wheel should activate.
Modulate Wheel
1. Navigate to the Checkout menu and press
2. The cooling should turn off and the wheel should be
rotating at full speed.
3. Navigate to Damper Open and press
to run the test.
4. Voltage between terminals ACT 2-10 and ACT COM
should be 10 VDC. This will slow the wheel down to
minimum speed.
5. Press (escape), navigate to Damper Close and
press (enter) twice to run the test.
6. Voltage between terminal ACT 2-10 and ACT COM
should be 2 VDC. This will speed the wheel up to
maximum speed.
36 Energy Recovery Ventilator with Heating and Cooling General Description - NOT model specific

Frost Control

(enter).
Timed Exhaust
1. Remove power from unit.
(enter) twice
2. Jumper the frost indicating wheel pressure switch in
the unit control center.
3. Jumper the temperature indicating thermodisc in
the unit control center. Thermodisc has a pre-set
temperature of 5°F.
4. Set the frost control timer scale for T1 and T2 to 1m.
(Enter).
Set the timer settings for T1 and T2 to 10.
5. Add power to the unit. Blower should cycle on for
one minute, then turn off for one minute.
(enter) twice
6. Remove power from unit and remove jumpers that
were placed. Reset timer settings.
• T1 timer
setting set to
5 and timer
scale set to
10m for 5
minutes of
wheel off time.
• T2 timer
setting set to
5 and timer
scale set to 1h
for 30 minutes
of wheel on
time.
Electric Preheat
1. Remove power from unit.
2. Jumper the frost indicating wheel pressure switch in
the preheat control center.
3. Jumper the temperature indicating thermodisc in
the preheat control center. Thermodisc has a pre-set
temperature of 5° F.
4. Apply power to unit. Preheater should turn on.
Timer
Scale
Timer
Settings
Timer
Scale
T1
Settings
T2
Settings
®