Technical information

12/01/02
CONTROL BOARD FUSE
Beginning in May 2002 Hoshizaki began including a 10 Amp
control fuse on KM models. This new feature was added
to specific models as they were produced. The fuse is
located in a fuse holder that is mounted on the control box
and connected in the circuit supplying 115V to the control
board 10-pin connector through pins 10 & 7.
The purpose of this fuse is to protect the control board
from damage in case of a short circuit in one of the compo-
nents. This fuse will also offer some protection against
external wiring problems, voltage spikes, and surges.
If the fuse is blown, you should isolate each individual
component and check for shorts and grounded conditions.
It is important that any external wiring connections, includ-
ing the remote condenser circuit be checked before re-
placing this fuse. If the problem is not corrected, the fuse
will blow again.
In general, you should check the component that connects
to the pin that has a burnt trace on the back side of the
board first. The fuse is a Bussman AGC 10 Amp 250VAC
slow blow fuse, Hoshizaki part # 4A0893-07 and should
only be replaced with one of identical size and type. A
replacement fuse is taped to the control box.
Should you want to add this feature to an existing KM unit
in the field, you can order fuse holder # 4A0892-01, fuse
label # 4A2817-01 and fuse # 4A0893-07, through your
local distributor. You should also make a note on the wiring
diagram indicating the fuse addition, fuse size and type.
On the following page, you will find a typical wiring dia-
gram showing where the fuse is wired in the circuit and
the label that is included on the control box.
38
The service switch also has three positions, “DRAIN-
CIRCULATE-WASH”. With the control switch in SERVICE
and the service switch in DRAIN, the pump starts and drain
valve solenoid opens to automatically drain the reservoir.
In the CIRCULATE position, the pump motor circulates cleaner
to the outside of the evaporator. In WASH, the cleaning
solenoid energizes and the pump circulates cleaner to the
inside and outside of the evaporator.
12/20/03
2/20/03