Williamson-Thermoflo GWA 3 Series, Руководство пользователя

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37
Part Number 550-142-320/0720
GWA Series 3 Gas-Fired Water Boilers – Boiler Manual
13 Troubleshooting – spark-ignited pilot boilers
Sensor resistance values
Temp
(°F)
Sensor ohms Temp
(°F)
Sensor ohms
Min Max Min Max
32 34265 37871 120 4517 4992
40 27834 30764 130 3698 4088
50 21630 23907 140 3043 3364
60 16944 18727 150 2517 2782
70 13372 14780 160 2091 2311
80 10629 11747 170 1744 1928
90 8504 9399 180 1461 1615
100 6847 7568 190 1229 1359
110 5545 6129 200 1038 1147
Temperature sensor
1. The boiler temperature sensor is a resistance-type
device.
2. See Figure 25 below shows the correct value for the
sensor at various temperatures.
3. Use the resistance values at 32°F, 60°F, 70°F and
212°F to measure the sensor resistance at known
temperatures (ice point, room temperature and sea
level boiling point). For ice point and boiling point,
insert the sensor in water at that temperature. Use an
ohmmeter to read resistance value between thermis-
tor # and thermistor common. See Figure 27, page 38,
for sensor plug details.
Figure 25 Sensor resistance values
NOTE:
If no power at control verify if external LWCO is
LOCKED OUT.
If in Low Water condition, Power is disrupted to
control.
Control indicator lights —
HARD LOCKOUT Summary (Flashing LED’s)
MAY remove 120 VAC power for more than 2 seconds to clear
lockout OR ignition control will automatically restart sequence
of operation after 1 hour waiting period after fault condition is cleared.
INDICATOR LIGHT CONDITION
POWER
Flashes once per second 120 VAC connection to boiler reversed
or there is insufficient earth ground.
Flash code 2*
Internal fault, microprocessor or memory.
Flash code 3*
Unused.
Flash code 4*
Unused.
Flash code 5*
Internal fault, water thermistors disagree.
Flash code 6*
Internal fault, gas valve circuit.
* Flash code pattern: POWER LED flashes 2, 3, etc. times rapidly
followed by 2 seconds off, then repeats.
ALL LED’S FLASHING Failure to establish pilot flame after 4
attempts. Propane Gas Only requires
Manual Reset, see pages 26 and 27
to correct.
SOFT LOCKOUT Summary (Flashing LED’s)
MAY remove 120 VAC power for more than 2 seconds, cycle thermostat
for between 2 and 20 seconds, OR ignition control will automatically re-
start sequence of operation after 1 hour waiting period.
INDICATOR LIGHT CONDITION
POWER + TSTAT/CIRC
High voltage detected on TSTAT circuit.
POWER + DAMPER
Damper stuck closed or unable to close end
switch within 45 seconds from TSTAT call.
POWER + FLAME
Flame sensed without call for heat or out
of sequence during ignition trial.
CAUTION Summary (Flashing LED’s)
INDICATOR LIGHT CONDITION
DAMPER
Damper end switch opened after it had
been proven closed.
LIMIT
Fault detected in temperature sensing hardware.
FLAME
Flame loss or flame not sensed during trial
for ignition.
Troubleshooting the control module
See Figure 27 , page 38 , for location of harness plug receptacles
and plugs on the control module.
Figure 26 GWA Ignition control module
Control module
Solder or water
splatter between plugs
and circuit board can cause improper
operation of control module. Place a
shield over the boiler internal controls and
components during installation. Failure to
comply could result in severe personal
injury, death or substantial property dam-
age.
Make sure
ground wiring
is installed
per wiring diagram. Good grounding is
extremely important for proper operation.
The information on this page and pages 38
through 44 apply only to spark-ignited
pilot GWA boilers. These boilers are
equipped with an ignition control module
that has indicator lights to show control
status. See Charts 1 through 6 , pages 39
- 44 , help you identify problems based on
indicator light conditions.