Friedrich R410A manual Test the 10 amp/250 VAC fuse for continuity

ELECTRONIC CONTROL BOARD COMPONENTS IDENTIFICATION AND TESTING (Continued) (See wiring diagrams pages 41-46)

Front	VPAK 24K	Back
	High Pressure Switch

Reversing Valve

Not Used

Not Used

High Speed

Not Used

Low Speed

Diagnostic

Service Module

Not Used

T-stat Terminals

Not Used

(Blue)

(Green)

Not Used

Transformer

115/230 Volts

FP F2 F1 D2 D1 C GH GL B Y W R

Low Voltage Interface Connection

Transformer voltage Selector Switch 115/230 Volts Ensure it is set at 230VAC

Sample board for Kuhl+ unit

Fuse 10 Amps

250 VaC

1.Test for power at L1 and L2 for 208/230 VAC. (Ensure the transformer voltage selector switch is set for 230 VAC)

2.Test the 10 amp/250 VAC fuse for continuity.

FOR THE FOLLOWING TESTS, ENSURE THE UNIT IS IN THE APPROPRIATE SETTINGS FOR THE TEST BEING PERFORMED. ENSURE THERE ARE NO ERROR CODES ACTIVE.

3.Testing the compressor relay and heat relays:

Test for power in and power out. If there is power in and no power out, replace the electronic control board. (208/230 to L2)

4.Testing the fan and reversing valve relays:

Test for power at the reversing valve and fan relays 1 or 3. (208/230 to L2)

5.Testing the transformer:

Test the low voltage terminal strip at: R and C for 24 VAC

F2 and F1 for 24 VAC

D2 and D1 for 24 VAC

Test the service module connector for 5 VDC (see prior page) Test the connectors for the thermistors for up to 5 VDC

If there is no voltage at any of the above, replace electronic control board.

6.Testing the thermistors:

Disconnect the thermistor and test for resistance value (see page 35)

7.Testing the high pressure switch (VPAK 24K only)

Test for 24 VAC at board, if there is no voltage, replace the electronic control.

Test the pressure switch for continuity, if none, replace it (switch is normally closed)

18