Vogt HEC-10, Service Manual

Page: 102 / 114

HEC-Series Service Manual
SERVICE OPERATIONS
10/21/01
9-20
! WARNING !
Acid can cause serious burns or blindness. Always add the acid
to the water for dilution. Wear eye and body protection.
! WARNING !
Water Tank. The production of opaque ice usually indicates that the water in the water tank
contains a concentrated amount of solids or salts.
Remove cover plate, open drain valve (39) and clean tank thoroughly by flushing out with a hose and
scrubbing with a stiff brush. Close the drain valve and refill tank with fresh water. Also see “Ice
Making--Cleaning Procedure”, Section 7.
When restarting the machine after filling the water tank, be sure that the water pump is circulating
water. It is possible that air may have collected in the pump impeller housing and the unit may have
to be stopped and started several times to expel the air.
FIGURE 9-14
CPR (Crankcase Pressure Regulating) Valve
CPR (Crankcase Pressure Regulating) Valve. The CPR valve is designed to prevent overloading
and liquid slugging of the compressor. It limits the crankcase pressure to a predetermined maximum
value during and after a harvest (thawing) cycle. The valve automatically throttles the vapor flow
from the evaporator until the compressor can handle the load.
When installing the CPR valve with solder type connections, the internal parts must be protected by
wrapping the valve with a wet cloth.