Design Dynamics HCM-24-RFP ユーザーズマニュアル

www.desatech.com

115481-01B

14

OBSERVED PROBLEM

Pilot burning, no gas to burner,

valve knob "ON", wall switch

"ON"

Frequent pilot/burner outage

problem

REMEDY

1. Check wall switch and wires

for proper connections. Jump-

er wire across terminals at wall

switch. If burner comes on,

replace defective wall switch.

If okay, jumper wires across

wall switch wires at valve. If

burner comes on, wires are

faulty or connections are bad

2. Check thermopile with mil-

livolt meter. Take reading at

thermopile terminals of gas

valve. It should read 325 mil-

livolts minimum with optional

wall switch "OFF". Replace

faulty thermopile if reading is

below speciﬁed minimum.

3. Check burner oriﬁce for stop-

page and remove

1. Clean and/or adjust pilot ﬂame

for maximum ﬂame impinge-

ment on thermocouple (see

Figure 13, page 11)

POSSIBLE CAUSE

1. Wall switch or wires

defective

2. Thermopile may not be

generating sufficient mil-

livoltage.

3. Plugged burner oriﬁce

1. Pilot ﬂame may be too low

or blowing (high) causing

the pilot/valve safety to drop

out

TROUBLESHOOTING

Continued