8
NOTE
: If, after using the following test, you still hear relays
clicking upon charge, carefully check wiring, blower capacitor, and
blowers.
Alternate procedure to check blower speed:
Blower Speed Test
HIGH SPEED
1. Disconnect ERV from 115 VAC.
2. Unplug wall control wires at control module terminal block
inside ERV.
3. Plug ERV back to 115 VAC.
4. Attach a wire across J3--8 and J3--9 (B and G) on control
module terminal block.
5. Push in door switch, this will initiate a high--speed ex-
change.
LOW SPEED
1. Unplug ERV from 115 VAC.
2. Disconnect wall control wires at control module terminal
block inside ERV.
3. Plug ERV back to 115 VAC.
4. Connect a 3.0 K ohm resistor between B and G on control
module terminal block.
5. Push in door switch, 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 (see Table 9 and 10).
To change low speed to medium speed, proceed as follows:
1. Unplug unit from 115 VAC.
2. Remove filters and core from ERV.
3. Slide blower assembly to the right until wire connections
are visible.
4. Locate red wire and blue wire coming from blower assem-
bly.
5. Unplug red wire from quick connect.
6. Unplug protecting cap quick connection from blue wire and
put on red wire coming from blower. The cap is a safety
insulator.
7. Connect red wire of main harness to blue wire.
8. Replace wires, blower assembly, filters, and core.
Outdoor Air Thermistor
When unit is not responding to wall control, check outdoor air
thermistor.
1. Remove thermistor wire from control board.
2. Take ohm reading across thermistor.
3. Refer to Table 8 for temperature/ohm relationship.
ER
V