Weil-McLain GOLD DV WATER BOILER Boiler User Manual


 
Part number 550-141-850/069976
GOLD GV Water boiler series 3 manualGOLD GV Water boiler series 3 manual
GOLD GV Water boiler series 3 manualGOLD GV Water boiler series 3 manual
GOLD GV Water boiler series 3 manual
Troubleshooting GCM lights (continued)XIg
CHART 3
LIMIT
&
POWER
lights flashing
Electrical shock hazard Wherever you see
TURN OFF POWER
, follow the instructions. Failure to follow
instructions could result in severe personl injury, death or substantial property damage.
TURN OFF POWER
to boiler at 120 VAC service switch.
Remove
CONTROL CIRCUIT
plug from control module receptacle (
Figure 34, Item 5
).
Remove a wire from one of the limit control spade connectors.
Connect an ohmmeter across the left and right pins on the center row of the limit circuit harness.
Does the ohmmeter indicate a shorted wire harness (zero ohms)?
NoYes
Is boiler hot?
This is a lockout condition. The return water temperature
sensor has signaled a temperature higher than 240 ˚F, but
the boiler limit circuit is closed (indicating that the limit
control circuit did not catch the over-temperature condition).
This is probably an indication of a failure of the boiler limit
control and possibly the block temperature switch as well.
Replace control wiring harness.
Retest.
Reconnect CONTROL CIRCUIT plug to control module.
Remove WATER TEMP SENSOR plug from control
module receptacle (
Figure 34, Item 6
).
Connector an ohmmeter across the plug pins to check
the sensor resistance.
Does the ohmmeter indicate a shorted sensor (zero ohms)?
NoYes
NoYes
Replace water temp sensor.
Retest.
Close the external manual gas valve.
Remove one wire from the limit control
space connector.
Set a thermostat to call for heat. Then
turn on power to the boiler at the 120
VAC service switch.
The boiler system circulator should come
on and the control module should try to
cycle the boiler.
Allow the boiler circulator to run to cool
off boiler and system water.
After the boiler and system water have
cooled, turn off power at the 120 VAC
service switch and open the external
manual gas valve.
Set limit control knob to its minimum setting. Replace wire
to limit control spade connector.
Set a thermostat to call for heat.
Turn on power at 120 VAC service switch.
Control module should cycle boiler on and begin heating.
The limit control should shut off the gas valve when the
temperature at the boiler pressure/temperature gauge
has reached no more than about 20 ˚F higher than the
limit switch setting.
Does limit control shut off gas correctly?
NoYes
Replace limit control
and block tempera-
ture switch.
Retest.
Replace control
module.
Retest.