Grindmaster AMERICAN METAL WARE 87710, Installation And Operation Manual

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Page 14 American Metal Ware 87710E Coffee Urn
Problem
Possible Cause
Service Check
Remedy
Disassemble and clean out. May require new plunger assembly
.
Caution is advised to avoid damage to valve. See valve instruction sheet. On valves without integral strainer: Inst
all so that port marked “IN”
is
connected to out
side fresh water
supply
.
On valves with integral strainer: Inst
all so that arrow point
s in
direction of t
ank, away from fresh
water supply
.
Remove electrode assembly
. Clean
both electrodes. If still no remedy and connections are good, replace assembly
.
Make good secure connection. May require cleaning or replacement. Connect “BLACK”
wire lead to “FILL”
terminal. Replace Dual Level Control. Make sure main switch(es), fuse(s), circuit breaker(s), provide power to unit, that machine’
s circuit breaker is
OK and power switch, if provided, is on. Make sure all water supply line valves are open.
V
isual. W
ater entering
tank continuously
, and
usually slowly
.
V
isual.
Jumper from “HI” terminal to met
al
enclosure stop
s fill.
Jumper for “C” terminal (next to XL) to met
al
enclosure stop
s fill.
V
isual.
Jumper from “HI”
to “C”
does not stop fill. Nothing operates on machine. “Crack” fitting at water inlet for pressure check.
1) Fill solenoid valve leaking due to dirt or scale holding valve open, or worn plunger seat. 2) Fill solenoid valve inst
alled backwards.
1) High electrode coated with scale, or faulty
.
2) Missing or faulty com
-
mon connection for elec
-
trode circuit (“C” terminal to met
al enclosure).
3) Fill valve connected to “HEA
T”
terminal.
4) Dual Level printed circuit board faulty
.
1) No power at equipment. 2) No water at equipment
A) Overfilling of water tank when power is of
f.
B) Overfilling of water tank only when power to unit is on. C)
Auto refill fails to
fill water t
ank.
IV) Trouble Shooting Auto Refill, Low Water Cutoff, and Dual Level Control System