Справочник Пользователя для Weil-McLain Series 2

GOLD CGi Gas-Fired Water Boiler — Boiler Manual

48

Part Number 550-110-710/0107

Air pressure switch

Make sure boiler water temperature is 100 °F or cooler

before starting procedure to obtain appropriate read-

ings.

The  boiler  will  not  operate  correctly  unless  pressure

switch hoses are correctly located. The red hose con-

nects from the right side (negative) hose barb to the

flue  collector.  The  white  hose  connects  from  the  left

side (positive) hose barb of the switch to the connector

box (between flue collector and inducer) as shown in

, page 49.

Check pressure switch setting

1.  See

Figure 36,

page 49, and

.

.  Remove both air pressure switch hoses from air pressure switch.
3.  Install tees and tubing as shown in

, page 49, to inclined manom-

eter.

4.  Turn off gas valve and set thermostat to call for heat. Inducer will run but burn-

ers will not ignite.

5.  Check for 4 VAC between both air pressure switch terminals.

Troubleshooting air pressure reading

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

Pressure switch setpoint (for elevations 

above 2,000 ft, contact your local Weil-

McLain sales office for details.)

•  loose inducer wheel on motor shaft
•  inducer motor not in proper rpm
•  inducer back plate not sealed properly
•  blockage in block assembly

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

(see

), but there is not 4 VAC between both air

pressure switch terminals — replace air pressure switch.

Return to normal operation

When pressure reading is correct and air pressure switch is

operating properly — remove tees and reinstall hoses to air

pressure switch.

Check the following:

1.  Wire connectors to control module are se-

curely plugged in at module and originating

control.

.  Air pressure switch hoses are properly and

securely plugged in and are not damaged.

3.   Gas pressures:

a.  With boiler off — 13” w.c. maximum

natural or propane gas pressure up-

stream of gas valve.

b.  With boiler on:

•  5” w.c. minimum natural gas

pressure or 11” w.c. propane gas

pressure upstream of gas valve.

•  3 ½” w.c. minimum natural gas

pressure or 10” w.c. propane gas

pressure downstream of gas valve

— Can be adjusted by regulator

on gas valve.

Label all wires prior to disconnection when servicing

controls. Wiring errors can cause improper and danger-

ous operation.

Never  jumper  (bypass)  rollout  thermal  fuse  element

or  any  other  device  except  for  momentary  testing  as

outlined in

. Severe personal

injury,  death  or  substantial  property  damage  can  re-

sult.

Before troubleshooting:

1.  Have the following items:

a.  Voltmeter that can check 10 VAC and 4 VAC.
b.  Microammeter with a minimum scale range of 0-5.
c.  Continuity checker.
d.  U-tube manometer.

.  Check  for  10 VAC  (minimum  10 VAC  to  maximum  13 VAC)  to

boiler.

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

priate zone controls) are closed. Check for 4 VAC between thermostat

wire nuts and ground.