User Guide

Condensing PDV Series

Sequence of

Operation

Abnormal Operation (cont.)

times, then 3 times twice with 3 second pauses. The error self clears if the

fault clears for at least 15 seconds.

c. Water temperature in excess of ECO (Energy Cut Out) limit – The gas

control immediately turns off the pilot and main valves. It then proceeds to

flash 4 times with a 3 second pause. The blower continues to run until the

gas control is reset. To reset the control, rotate the temperature control knob

to the minimum setting for at least 6 seconds before returning to the desired

temperature setting.

3. Pressure Switch/Blower Temperature Fault:

a. Exhaust pressure switch closed at start of call for heat – The gas control

waits 4 seconds, then proceeds to flash 2 times a with 3 second pause. The

control waits 2 minutes and then turns on the blower for 30 seconds. The

blower turns off after 30 seconds and the control waits for the pressure

switch to open. Any time the pressure switch opens, the blower turns on (or

stays on) and the control proceeds to wait for the pressure switch to close.

b. Pressure switch or blower temperature switch failed to close – The gas

control runs the blower for 30 seconds, waiting for the pressure switch and/or

blower temperature switch to close. If either switch does not close in 30

seconds, the blower turns off and the control flashes 3 times with a 3 second

pause. The gas control waits 2 minutes before turning on the blower for

another 30 seconds to check if the circuit will close. This cycle repeats as

long as there is a call for heat or until the circuit closes.

c. Pressure switch or blower temperature switch opens during burner

operation – The gas control turns off the pilot and main valve and runs the

blower for 15 seconds (inter-purge), waiting for the pressure switch and/or

blower temperature switch to close. If either switch fails to close, the control

proceeds as described in 3b above. If the circuit closes again by the end of

the inter-purge, the recycle counter is incremented. If the recycle count has

not reached its limit (4), another trial for ignition begins. If the recycle count

has been reached, the gas control turns off the blower and flashes 6 times,

then 2 times with a 3 second pause. The gas control waits 5 minutes before

repeating ignition sequence.

4. Trial for Ignition Fault:

a. Pressure switch opens during trial – The gas control turns off the igniter

and pilot valve. The gas control proceeds as described in 3b above. If the

pressure switch closes within 30 seconds, the gas control will continue with

trial for ignition starting at blower pre-purge.

b. Flame not sensed – The gas control energizes the spark igniter attempting

to light the pilot and prove flame. If the flame is not sensed within 90

seconds, the igniter turns off, the pilot valve is closed and the gas control

runs the