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Table 21. Remote Controls.
Wire Color Voltage Resistance
Connector
No.
Pin
Nos.
Terminals A1 10-13 VDC 1.5-3.0k ohms A 1-3
Frost Protection:
This unit has frost protection heaters mounted at different points to protect the water the water heater
from freezing. The heaters located on the hot water outlet line should have a resistance reading of 10-20
ohms through each of these heaters. The heater located on the heat exchanger piping should have a
resistance reading of 35-50 ohms, and the one located in the water flow sensor valve, hot water outlet,
and drain connection should have a resistance reading of 110-150 ohms. The heater located on the
latent heat exchanger should have a resistance reading 90-110 ohms.
Amp Fuses:
This unit has one inline seven-amp glass fuses. Remove the fuse and check continuity through it. If you
have continuity through the fuse, it is good. Otherwise, the fuse is blown and must be replaced.