Refrigerant Charging; Determining The Amount Of Charge - Wine Guardian PRO Series Installation, Operation And Maintenance Manual

Fig. 1
Low
Voltage
Block
• The condensing unit needs to be hard-wired for the rated high voltage to be brought to
the factory-installed contactor in chassis cabinet to the line side (L1 & L2) of the
contactor. Use table 1 to identify the minimum recommended AWG, USE COPPER
WIRE ONLY. Run a ground lead to be connected to the condensing unit Ground
lead/LUG. There is a separate ground lug for the condensing unit internal components
(See Fig 2). The load side of the factory-installed contactor will be factory-wired. •
• Turn on power to the condensing unit 24 hours prior to system start-up to allow
crankcase heater to warm up compressor crankcase.

Refrigerant Charging

NOTE: The SP25, SP50, SP88 and SP200 systems utilize a Headmaster control
valve to control head pressure at low ambient applications, therefore require a
specific initial charging procedure as outlined below.
Determining the amount of charge – When "refrigerant side" head pressure control is
utilized on a system, one of the most important factors is determining the total system refrigerant
charge. While on most packaged units the amount of charge is listed on the unit, the required
charge for a field built-up system cannot be listed by the manufacturer. Charge is usually added
when the system is started up until "proper" system performance is reached. However, this is not
satisfactory and if the system is to function properly year-round, the correct amount of extra
charge must be calculated ahead of time.
41
Recommended
Unit
Minimum AWG
SP200; WGS175
SP88; WGS100
SP50; WGS75
SP25; WGS40
24 volt
terminal
block
On/Off
switch
12
16
16
16