Start-Up; Refrigerant Charging; Charging System With Head Pressure Control - Wine Guardian SP25 Installation, Operation And Maintenance Manual

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The condensing unit needs to be hardwired. To bring the rated high voltage to the
factory-installed contactor in the chassis cabinet to line side (L1 & L3) 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
3). The load side of the factory-installed contactor will be factory-wired.
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Turn on power to the condensing unit 24 hours prior to system start-up to allow
crankcase heater to warm up compressor crankcase.

Start-Up

Prior to charging the system and start-up ensure the system has been powered for at
least 24 hours. This is required so the compressor's crankcase heater has ample time
to warm the system to avoid premature failure. Then proceed to charging the system.

Refrigerant Charging

Note: Models DS, and WGS 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 (Low Ambient and Extreme Climate Protection) -
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.

Charging System with Head Pressure Control

Note: When charging any system with head pressure control the outdoor ambient
temperature must be known.
Charging of Systems with Head Pressure Control in temperatures above 70°F (21°C)
(After normal evacuation procedures):
1. Connect refrigerant cylinder to liquid line service valve port.
2. Charge liquid refrigerant into the high side of the system. Weighing the charge is
recommended.
3. Remove the refrigerant drum and connect it to the suction service valve.
4. Charge refrigerant vapor into the low side. Do not allow liquid refrigerant into the
low side.
5. Start the system.
Recommended
Unit
Minimum AWG
SP25 16
29