TECH - SPEC'S Technician's Pocket Guide - Hoshizaki America, Inc.

REMOTE HEAD PRESSURE CONTROL
All remote condenser units utilize a condensing pressure regulating
(CPR/Headmaster) valve to maintain head pressure in
low ambient conditions. You will find a Sporland LAC-4 210
psig. valve mounted in the condenser of all R-404A remote
units with the exception of the KM-2400SRF3. The KM-
2400SRF3 model uses a Sporland LAC-5 210 psig valve
which is mounted in the unit head.
R
D
The symptoms of a bad headmaster are similar to an undercharged
unit. To diagnose a bad headmaster, add additional
refrigerant in 2 lb. increments and watch the pressures. If
the pressures begin to look normal, the unit was undercharged.
In this case, leak check the system to find the leak and use
normal refrigeration practices to recover, repair, evacuate and
recharge the unit. If not, a bad headmaster is a possibility.
Check to see if the valve is stuck open by conducting temperature
checks at the outlet of the headmaster. Replace the
headmaster as necessary. Use safe refrigeration practices
when removing the valve and protect the valve from overheating.
HIGH PRESSURE SAFETY SWITCH
An automatic reset high pressure safety switch is utilized on
all Hoshizaki “F” series ice makers. The pressure switch part
numbers and settings are as follows:
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