Manualshelf

Installation manual

ManualsBrandsEmerson ManualsKitchen AppliancesLiebert Deluxe System/3 DE
51525354555657585960
Water Cooled Models
48
5.0 WATER COOLED MODELS
5.1 Piping Considerations
Manual shut-off valves should be installed at the supply and return lines of each unit. This will pro-
vide for routine maintenance or emergency isolation of the unit.
When the water source for the condenser is of poor quality, it is good practice to provide cleanable fil-
ters in the supply line. These filters will trap the particles in the water supply and extend the service
life of the water-cooled condenser.
To provide for the emergency of water leaks and the consequences of sub-floor flooding, floor drains
should be provided with wet traps or a water detection system such as a Liqui-Tect sensor that is
installed near the base of the unit or below the elevated floor.
5.2 Condenser
The condenser is designed to operate in conjunction with either a cooling tower or city water.
5.3 Water Regulating Valve
Water regulating valves automatically open on refrigerant pressure increase and close on pressure
decrease.
To adjust the head pressure, attach refrigeration gauges to the compressor discharge and suction ser-
vice valves. Raise the head pressure by turning the adjusting screw counterclockwise. Lower the head
pressure by turning the adjusting screw clockwise. Allow enough time between changes for the sys-
tem to stabilize.
5.3.1 Testing Valve Function
When the refrigeration system has been off for approximately 10-15 minutes, the water flow should
stop.
Should the water continue to flow, the valve is either improperly adjusted or the pressure sensing
capillary is not connected properly to the condenser.
5.3.2 Manual Flushing
The valve may be flushed by inserting a screwdriver or similar tool under the two sides of the main
spring and lifting. This action will open the valve seat and flush any dirt particles from the seat.
Table 35 Refrigerant control settings for water cooled units—psi (kPa)
Refrigerant
Type
Low
Pressure
Cut Out
Low
Pressure
Cut In
High
Pressure
Cut Out
R–22 20 (137.9) 65 (448.2) 360 (2482)
DISCONTINUED
PRODUC T