Справочник Пользователя для Weil-McLain GOLD CGI-4E

48

Part Number 550-110-711/1108

Troubleshooting — general

 

Make sure boiler water temperature is 

100 °F or cooler before starting proce-

dure to obtain appropriate readings.

 

The boiler will not operate correctly un-

less pressure switch hoses are correctly 

located.  The  red  hose  connects  from 

the right side (negative) hose barb to 

the flue collector. The white hose con-

nects from the left side (positive) hose 

barb of the switch to the connector box 

(between flue collector and inducer) as 

shown in 

, page 49.

1.  See

Figure 36, 

page 49, and 

.

2.  Remove  both  air  pressure  switch  hoses  from  air  pressure 

switch.

3.  Install  tees  and  tubing  as  shown  in 

,  page  49,  to 

inclined manometer.

4.  Turn off gas valve and set thermostat to call for heat. Inducer 

will run but burners will not ignite.

5.  Check for 24 VAC between both air pressure switch termi-

nals.

1.  If manometer reading is lower than the setpoint of the switch 

(see

) — check for possible causes:

•  blockage in hoses
•  obstruction in inducer housing outlet
•  loose inducer wheel on motor shaft
•  inducer motor not in proper rpm
•  inducer back plate not sealed properly
•  blockage in block assembly
•  blockage in flue pipe or termination
•  incorrect pressure switch

6.  If manometer reading is above the setpoint of the switch (see 

), but there is not 24 VAC between both air pressure

switch terminals — replace air pressure switch.

When pressure reading is correct and air pressure switch is oper-

ating properly — remove tees and reinstall hoses to air pressure 

switch.

Pressure switch setpoint (for elevations 

above 2,000 ft, contact your local Weil-

McLain sales office for details.)

1.36

 

Label  all  wires  prior  to  disconnection  when 

servicing  controls.  Wiring  errors  can  cause 

improper and dangerous operation.

Never jumper (bypass) rollout thermal fuse ele-

ment or any other device except for momentary 

testing as outlined in 

. 

Severe  personal  injury,  death  or  substantial

property damage can result.

1.  Have the following items:

a.  Voltmeter that can check 120 VAC and 24 VAC.

b.  Microammeter with a minimum scale range of 0-25.

c.  Continuity checker.

d.  U-tube manometer.

2.  Check for 120 VAC (minimum 102 VAC to maximum 132 VAC) to 

boiler.

3.  Make sure thermostat is calling for heat and contacts (including appro-

priate zone controls) are closed. Check for 24 VAC between thermostat 

wire nuts and ground.

1.  Wire connectors to control module are securely plugged in at module 

and originating control.

2.  Air pressure switch hoses are properly and securely plugged in and are 

not damaged.

3.   Verify gas supply pressure:

a.  With boiler OFF — 13” w.c. maximum natural or propane gas 

pressure upstream of gas valve.

b.  With boiler ON — Upstream: 5” w.c. minimum natural gas pres-

sure or 11” w.c. propane gas pressure upstream of gas valve.

4.   Verify gas manifold pressure (downstream of gas valve):

a.  Natural gas: 

Manifold pressure, high fire: 3.50” w.c.

 

Manifold pressure, low fire: 0.90” w.c. while in low fire at start-up 

(60 seconds)

b.  Propane gas: 

Manifold pressure, high fire: 10.0” w.c.

 

Manifold pressure, low fire: 3.50” w.c. while in low fire at start-up 

(60 seconds)

c.  If necessary, adjust gas pressure on the gas valve as shown below. 

After adjustments, refer to page 35 to check the flame.