American Metal Ware 74110, Инструкция по установке, эксплуатации и обслуживанию

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IV. Trouble Shooting Auto Refill, Low Water Cutoff, and Liquid Level Control System. - Continued
PROBLEM POSSIBLE CAUSE SERVICE CHECK REMEDY
F. High speed (rapid fire) chatter-
ing that ends with liquid level
control system failure. See
note 2
.
1. Capacitor failure on liquid
level control printed circuit board
causes rapid back and forth
switching between fill and heat. Visual and audio. Replace liquid level control. Also, check
contactor or steam valve or gas valve, fill
solenoid valve, and if provided, control cir-
cuit transformer.
G. Thermostat set on brew. Water
cold. 1. No power at urn. Check main fuse or breaker-check
circuit breaker on urn Reset breaker or new fuse. Reset urn breaker.
2. Power at urn-no power at
heater terminals. Check circuit breaker on urn. Reset breaker or replace.
Check water level should be at stop
level on gage. Open water supply valve to urn. Clean out
water line strainer.
Check power at thermostat termi-
nals. If none replace thermostat or liquid level sys-
tem board.
3. Voltage at heater terminals but
no heat. Check heater for open element. If necessary, replace defective element.
Remove coffee liner to replace.
H. Water boils continuously on
brew setting. 1. Thermostat out of calibration. Thermostat should cut off power to
heater when thermometer needle at
far right end in blue brew zone. With stat knob set on brew. Pull off knob.
Turn adjusting screw inside knob shaft clock-
wise to reduce cut off setting.
2. Thermostat inoperative. Will not accept calibration (Item 1
above) Replace thermostat. (Necessary to drain all
water from urn.)
3. Contactor sticking in closed
position. Will not click on or off. Replace contactor
J. Urn circuit breaker trips fre-
quently. 1. Liquid level relay malfunction. Check with OHmeter to ground. Replace entire unit.
2. Solenoid valves grounding out. Check coils to ground with
OHmeter.
Replace coil.
K. Continuous leak from spray
nozzle (slight dripping during
heat up is normal due to expan-
sion drippage). Dirt or scale on solenoid seat. Dripping stops with power to urn
off. Clean out solenoid valve - replace rubber seat
if necessary.
L. Quantity of water sprayed over
erratic. 1. Adjust flow regulator inside
control box out of adjustment. Turn adjusting screw clockwise to increase
flow - counter-clockwise to decrease.
2. Line water pressure too low
(under 30 PSI at urn). Measure water pressure in line to
urn. Check for undersized lines or
other equipment on same supply. Increase water pressure to urn. Replace water
lines w/ 3/8
″
tube or larger.
3. Timer repeating. Check 2-3 cycles for accuracy. Replace timer if erratic.
S6161-JB-FSE-010
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