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8
SERVICE
Electronic Controls
This eq
ui
pment
i
s to be
instal
l
ed to
comply wit
h the B
asi
c
Pl
umbing Code of
th
e Bui
l
ding Officials
and C
ode
A
dminist
ra
t
ors I
nter
nati
o
nal
, Inc
. (B
OCA)
and
the Foo
d Serv
i
c
e
S
anitation Ma
nual
of
the
Foo
d a
nd D
r
ug
Admini
str
at
i
on (FDA).
FIG. 8a ELECTRONIC CONTROL
P4093.35
Voltage present at
Solenoid Valve
?
Voltage present at
Solenoid Valve
?
Overflow Cup Full
?
Remove Power
Disconnect Level Probe
Retry
Drain cup
No
Yes
Yes
Yes
Yes
No
No
No
H5E, H5X LIQUID LEVEL CONTROL
PROBLEM: Does Not Refill
Does Water Flow
?
Replace Probe
Unplug Ready Lamp
Replace Ready Lamp
Replace Control Board
Replace Solenoid Valve
Overflow
?
Overflow
?
Retry
Drain cup
Yes
Yes
No
H5E, H5X LIQUID LEVEL CONTROL
PROBLEM: Overflows
Unplug Ready Lamp
Retry
Retry
Drain cup
Drain cup
Short Probe Wire
To Chassis
Disconnect Probe
Wire From Probe
Disconnect Wire From
Solenoid Valve
Replace Ready Lamp
No
Replace Probe
Overflow
?
Yes
Replace Control Board
No
Replace Solenoid Valve
Location:
The electronic control board is located inside the
rear of the dispenser. Access will also be needed to the
temperature sensor, overflow tube temperature sensor,
and liquid level probe located on the tank lid.
General:
This system controls the liquid level and water
temperature of the dispenser. These two functions
act independently of each other and should be tested
separately.
Liquid Level Control Flow Charts
42311 071310
BUNN
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)
.750 gpm FLOW
Triac Assy
Electronic
Control Board
P1991-1.30
FIG. 8b ELECTRONIC CONTROL
BOARD AND TRIAC
H 10
H 5