Bunn HW2 - Electronic Controls

SERVICE
Electronic Controls
This equipment is to be installed to
comply with the Basic Plumbing Code of
the Building Officials and Code
Administrators International, Inc. (BOCA)
and the Food Service Sanitation Manual
of the Food and Drug Administration (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 (digital 5 gallon models). 3 & 5 gal-
lon Elements control boards are located in the front
shroud. 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 tempera-
ture of the dispenser. These two functions act indepen-
dently of each other and should be tested separately.
Liquid Level Control Flow Charts
H3/5/10 LIQUID LEVEL CONTROL
H3/5/10 LIQUID LEVEL CONTROL
8
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