48
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 co
mpressor’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.
6. Observe sight glass (factory-installed) to see if system is filling with refrigerant for
normal refrigeration cycle.
7. If the Sight glass shows bubbles, more refrigerant may be required, while
allowing sufficient time for the refrigerant to stabilize and clear the Sight glass.
Use supplied information on the following pages for proper final charge.
BUBBLES IN THE SIGHT GLASS CAN BE CAUSED BY FLASHING DUE TO
PRESSURE DROP FROM PIPE OR ACCESSORY LOSSES, ETC.
Summary of Contents for WINE GUARDIAN DS025
Page 13: ...13 Overview of the Evaporator Fig 1...
Page 14: ...14 Overview of the Condenser Fig 2...
Page 15: ...15 Refrigeration Illustration Fig 3...
Page 16: ...16 Wiring Diagram for DS025 WGS40 Fig 4...
Page 17: ...17 Wiring Diagram for DS025 WGS40 cont Fig 5...
Page 18: ...18 Wiring Diagram for DS025 WGS40 cont Fig 6...