Troubleshooting Power Circuit - Aprilaire 1730A Troubleshooting Manual

Troubleshooting Power Circuit

1. Turn the ON/OFF switch OFF and remove the REMOTE terminal block.
2. Remove the dehumidifier cover.
3. Remove the electrical panel.
4. Check all electrical connections using wire color and printing on the control board to
verify proper placement and verify all connections are fully seated and secure.
a. White wire from transformer connected to NTRL WHT terminal on control board,
A. White wire from power cord connected to piggy back terminal, B.
b. Black wire from transformer connected to LINE BLK terminal on control board, C.
Black jumper wire from dehumidifier ON/OFF switch to piggy back terminal, D.
c. Black jumper wire at dehumidifier ON/OFF switch, E.
d. Black wire from power cord at dehumidifier ON/OFF switch, F.
e. Green wire from power cord to dehumidifier base with screw and ring terminal,
G.
f. Two blue wires from transformer to 24 VAC terminals on control board, H.
5. Turn the ON/OFF switch ON and measure the voltage at the 120VAC input terminals,
NTRL WHT and LINE BLK.
a. The voltage should be between 103.5 – 126.5VAC.
b. If the voltage is not within this range, check the ON/OFF switch, power cord,
outlet, and circuit breaker.
6. Measure the voltage at the 24VAC input terminals.
a. The voltage should be between 19.2 – 28.8VAC.
b. If the voltage is not within this range, replace the transformer (5398).
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 Each quick connect terminal will also have yellow wires that supply
24VAC to the external control.