Manitowoc QF0800 Especificaciones descargar pdf (Pagina 196)

196 Part Number 80-1230-9 6/08

• Harvest pressure regulating valve (H.P.R. valve).

This is a pressure regulating valve which

modulates open and closed, based on the

refrigerant pressure at the outlet of the valve. The

valve closes completely and stops refrigerant flow

when the pressure at the outlet rises above the

valve setting.

FREEZE CYCLE

The H.P.R. system is not used during the freeze cycle.

The H.P.R. solenoid is closed (de-energized),

preventing refrigerant flow into the H.P.R. valve.

HARVEST CYCLE

During the harvest cycle, the check valve in the

discharge line prevents refrigerant in the remote

condenser and receiver from backfeeding into the

evaporator and condensing to liquid.

The H.P.R. solenoid is opened (energized) during the

harvest cycle, allowing refrigerant gas from the top of

the receiver to flow into the H.P.R. valve. The H.P.R.

valve modulates open and closed, raising the suction

pressure high enough to sustain heat for the harvest

cycle, without allowing refrigerant to condense to liquid

in the evaporator.

In general, harvest cycle suction pressure rises, then

stabilizes in the range of 70-100 psig (517-758 kPA).

Exact pressures vary from model to model. Refer to

the “Operational Refrigerant Pressures” charts.

SV3053

OUTLET

INLET

HPR VALVE

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Manitowoc QF0800 Especificaciones Pagina 196