A.O. Smith HW 610 ユーザーズマニュアル

47

Use this checkout for Cer-Temp 80 Recovery Systems. (For hot water supply application only)

Set  tank  temperature 

control (thermostat) 20°F 

(10°C)  below  tank  water 

temperature.

Circulating pump and 

burner shut off.

With thermal balancer, 

pump off delay of 

approximately 2 minutes.

Pump and burner remain 

on.

Tank temperature control 

(thermostat) defective.

Replace.

System wiring is 

incorrect.

Correct wiring.

Circulating pump on.

Pump wired for 

continuous operation.

Correct wiring.

Burner on.

Gas valve stuck or 

defective.

Correct or replace 

valve.

System wiring is 

incorrect.

Correct wiring.

Set tank temperature 

control (thermostat) 20°F 

(10°C) above tank water 

temperature.

Circulating pump and 

burner on.

Circulating pump on.

High limit control set too 

low.

Replace. (If problem 

proven to be at this 

control by applying 

jumper to terminals.)

High limit control 

differential too wide.
System wiring is 

incorrect.

Correct wiring.

Coil protector switch has 

activated.

Remove control cover, 

depress reset button.

Gas valve or wiring 

defective.

Check wiring. Repair or 

replace valve.

Circulating pump and 

burner off.

Power off or system 

wiring is incorrect.

Check power supply 

and wiring.

Tank temperature control 

(thermostat) defective.

Replace.

Burner on.

System wiring is 

incorrect.

Correct wiring.

Boiler outlet temperature 

exceeds 210°F (100°C). Circulating pump on.

Circulating pump and 

burner on.

High limit control 

defective, or set too high 

(max. should be set at 

200°F).

Replace.

Set tank temperature 

control (thermostat) 

for desired water 

temperature.

System maintains desired 

water temperature.