Pre-Troubleshooting; Troubleshooting - A.O. Smith Burkay HW-300 Installation Operation & Maintenance

PRE-TROUBLESHOOTING

Before any extensive trouble-shooting, perform the following:
Ensure That:
— Voltage (120 vac) is supplied to the appliance.
— System control (tank temperature control, thermostat, etc.) is calling
for appliance operation (call for heat).
— Other contacts (switches) are closed (relay, low water cutoff, flow
switch, coil protector, pressure switch, etc.).
Use this checkout for Cer-Temp 80 Recovery Systems. (For hot water supply application only)
Checkout Sequence
Set tank temperature
control (thermostat)
20°F (10°C) below
tank water temperature
Set tank temperature
control (thermostat)
20°F (10°C) above
tank water temperature.
Boiler outlet
temperature exceeds
210°F (100°C).
Set tank temperature
control (thermostat)
for desired water
temperature.

TROUBLESHOOTING

CER-TEMP 80 RECOVERY SYSTEM CHECKOUT PROCEDURE
SYSTEM OPERATION
Contact Incorrect
Circulating pump Pump and burner
and burner shut remain on.
off.
With thermal
balancer, pump off
delay of approx- Circulating pump
imately 2 minutes. on.
Burner on.
Circulating pump Circulating pump
and burner on. on.
Circulating pump
and burner off.
Burner on.
Circulating pump Circulating pump
on. and burner on.
System maintains.
desired water
temperature.
— Gas supply pressure is within the maximum and minimum operating
ranges listed on the appliance rating plate/label.
— Voltage (24 vac) is supplied by transformer.
— Appliance is wired according to wiring diagram.
Note: Cross wiring the 24 volt circuit of the relay will short the transformer.
— All wire terminals/connectors are firmly attached to valves, modules,
switches, limit controls, etc.
— For LP models only check for possible lockout condition of the ignition
module.
Cause
Tank temperature control
(thermostat) defective.
System wiring is incorrect.
Pump wired for continuous
operation.
Gas valve stuck or defective. Correct or replace valve.
System wiring is incorrect.
High limit control set too
low.
High limit control differential
too wide.
System wiring is incorrect.
Coil protector switch has
activated.
Gas valve or wiring
defective.
Power off or system
wiring is incorrect.
Tank temperature control
(thermostat) defective.
System wiring is incorrect.
High limit control defective,
or set too high (max. should
be set at 200°F).
57 57 57 57 57
Remedy
Replace.
Correct wiring.
Correct wiring.
Correct wiring.
Replace. (If problem
proven to be at this
control by applying
jumper to terminals.)
Correct wiring.
Remove control cover,
depress reset button.
Check wiring. Repair or
replace valve.
Check power supply
and wiring.
Replace.
Correct wiring.
Replace.