Vogt P18FXT, Service Manual

Page: 103 / 124

10TA Service Manual
SERVICE OPERATIONS
4/28/14
9-23
Defrost Pressure Switch –DPS (R404A Machines only).
The DPS is used to regulate the pressure
in the freezer during the harvest cycle. This pressure switch is wired in series with the D-valve
(thaw gas valve), which opens and closes during the harvest cycle to maintain 90 to 95 psig in the
evaporator.
Defrost Pressure Switch (DPS)
FIGURE 9-19
Pressure Relief Valves.
Pressure relief valves are installed on the freezer, receiver and the water
cooled condenser. These valves are designed to vent in emergency conditions. This ensures vessel
internal pressure does not exceed maximum allowable pressures.
CUT IN (CLOSE) ADJUSTING SCREW
SET AT 90 PSIG
(CW LOWERS SETTING)
Vogt Part #: 12A2117B03
CUT OUT (OPEN) ADJUSTING SCREW
SET AT 95 PSIG
(CW RAISES SETTING)
CE Approved machine
Vogt Part #:
12A2117B03CE
PRESSURE RELIEF VALVES MUST BE REPLACED
AFTER 5 YEARS OF SERVICE.
BEFORE REPLACING RELIEF VALVE, REVIEW REQUIREMENTS PER
CURRENT LOCAL AND NATIONAL CODE.
VALVE REPLACEMENT SHOULD BE MADE BY PROPERLY TRAINED
PERSONNEL ONLY.
NOTE: IF REFIEF VALVE DISCHARGES, VALVE MUST BE REPLACED BECAUSE
SETTING OR SEAT TIGHTNESS MAY BE ALTERED.
CONTACT VOGT ICE PARTS DEPARTMENT FOR REPLACEMENT VALVES.
PHONE: 502-635-3000