COOK HMD EN - Manual (Page 14)

14
Heater does not attempt to light. Heater attempts to light, but no flame
No
No
No
Replace 24 VAC transformer.#b
Correct / replace high temp overload switch.
Is there 24 VAC
between terminal blocks
9 & 10?
Is there 120 VAC between
terminal block #10 & high
temp limit switch #2?
Is there continuity
between terminal block
#4 & low pressure switch
normal open?
Yes
Yes
Yes
Yes
1. With all access panels in place, the fan running and discharging 70 0 F
(21 0 C) air, connect a U-Tube manometer to the outer sensing probes
(see below) and measure the static pressure across the burner. The
proper static pressure should be ( check CFM / Static Pre ssure chart
on page 8). If needed, evenly adjust the baffles, keeping the burner
centered in the opening until the required pressure is obtained. The
pressure drop was set at the factory and may not need adjustment.
When required pressure is obtained, be sure to reconnect the outer
sensing probes. This process may need to be repeated until the proper
pressure is achieved. This adjustment will change the air quantity
delivered by the unit and therefore the air quantity delivered should be
rechecked. Refer to the Blower Start-Up section.
2. To increase the static pressure decrease the opening.
3. To decrease the static pressure increase the opening.
Consult factory
Troubleshooting
No 1. Make sure supply switch is on.
Is there 120 VAC between
terminal block #2 &
circuit breaker terminal 2?
Refer to the control panel parts list when troubleshooting.