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NOTE: The core should only be serviced when outdoor
temperature is 60°Fto75°F(16°Cto24°C) and it is dry.
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
DO NOT use water to clean core or damage will result. In
addition, before servicing or removing the core inspect the
edges to see if they appear soft (or slightly expanded). This
can be normal and due to moisture in the air. DO NOT
handle or service core until it is dry or air passages can
become damaged and/or closed.
CAUTION
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing or servicing system, always turn off main
power to system. There may be more than 1 disconnect
switch.
!
WARNING
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing and gloves when
handling parts.
CAUTION
!
TROUBLESHOOTING
NOTE: Reference Table 5 Troubleshooting Chart
This can be a quick guide in resolving unit problems. It is also
recommended to review and understand Wall Control Board
Operation and Care and Maintenance sections before continuing.
NOTE: I f there is a s hort circuit or an open circuit at thermistor ,
CPU will go into a 5 minute defrost cycle every 20 minutes. This
feature is not there on older board versions with 3 pin jumpers.
Override Test
To use override test function, a thermistor must be connected to the
control board. Unit must not be in defrost mode during an override
test.
High Speed
1. Disconnect ERV/HRV from 115VAC.
1. Unplug wall control wires at control module terminal block in-
side ERV/HRV.
2. Plug ERV/HRV back to 115VAC.
3. Attach a wire across J3--8 and J3--9 (B and G) on control mod-
ule terminal block.
4. Close door, this will initiate a high--speed exchange.
Low Speed
1. Unplug ERV/HRV from 115VAC.
2. Disconnect wall control wires at control module terminal block
inside ERV/HRV.
3. Plug ERV/HRV back to 115VAC.
4. Connect a 3.0 K ohm resistor between B and G on control
module terminal block.
5. Close door, this will initiate a low--speed exchange.
Blower Speed Selection
Three--speed blowers are factory connected to electronic control
board on HIGH-- and LOW--speed taps of blowers. Installer can
easily change low--speed tap to medium--speed tap so electronic
control will select between high and medium speed. Connections
can be changed at motor location.
To change low speed to medium speed, proceed as follows:
1. Unplug unit from 115VAC.
2. Locate blower assembly.
3. Locate red w ire an blue wire coming from blower assembly.
4. Unplug red wire from quick connect.
5. Unplug protecting cap quick connection from blue wire and
put on red wire coming from blower. The cap is a safety insula-
tor .
6. Connect red wire of main harness to blue wire.
7. Replace wires.
ERV / HRV