Friedrich ZoneAire Select PZH12K3SC handleiding

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Handleiding

TROUBLESHOOTING

Electric Heater Not Running

1. Indoor unit air circulation is blocked. Remove the obstacle.

2. DIP switch of NO.3 is in OFF position. Set it to ON position.

3. Remove power from the unit.

4. Remove front panel (refer to to ﬁgure 701).

5. Open electrical control box (refer to ﬁgures 702 thru 705).

6. Restore power to unit.

7. Place a demand on he electric heater. Refer to the operation section.

8. Check Voltage

Check for voltage at output terminals on heater relays. If 230/ supply

voltage is present and heater element does not operate correctly,

replace heater assembly. If 230/265 volts in not present, check power at

heater relay input terminals..

9. Two limit switches are incorporated into the heater assembly. The

primary opens at 160°F and closes at 130°F. The secondary’s open temp

is 221°F. They can not be replaced independently. If they are found to be

faulty the entire heater assembly must be replaced as a unit.

a. Thermostat on the heater is cut out. Wait for awhile to see if it

can restart.

b. Thermal fuse is broken. Replace heater. Check resistance

(open reading).

10. Check Heater Coil

a. Testing of the elements can be made with an ohmmeter

across the terminals after the 2 heater wires have been

disconnected.

Readings should always been taken when coil is cold.

b. Reconnect wires and operate heat to place electric heater in

demand- See sequence of operation for details.

11. Wiring error. Check wiring with the circuit diagram.

Heater relay

Output terminals

Heater relay

Input terminals

Figure 509

Heater Coil Limit switches

Heater Wire

Terminals

Figure 510

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