Technical information

12/01/02

REMOTE HEAD PRESSURE CONTROL

All remote condenser units utilize a condensing pressure regu-

lating (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.

The symptoms of a bad headmaster are similar to an under-

charged 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 tem-

perature 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 over-

heating.

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:

12/20/03

2/20/03