Wine Guardian Ducted Split Wine Cellar Cooling Systems (WGS175) - Manual User Manual
Page 41
43
Charging of Systems with Sporlan Head Pressure Control in ambient below 20 degrees C
(After normal evacuation procedures):
NOTE: When charging in ambient below 20 Deg. C the procedure is very critical.
Be sure to adhere to the following steps. Failure to do so will result in
overcharging the system.
1. Follow instructions 1 through 7 above.
2. If the valve setting is correct for the system being charged, it is quite likely that some
refrigerant will be backed up into the condenser and the Sight glass will indicate
bubbles in the liquid line.
3. Add more refrigerant, 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.
4. At this point the system is correctly charged for this type of head pressure control at
the ambient temperature that exists while the charging procedure is taking place.
5. If the system is designed to operate at ambient below the ambient that exits during
charging, additional charge may have to be added now.
Since good system performance during low ambient operation depends on proper refrigerant
charge, it is very important that this phase of the installation procedure be done carefully.
Many times, poor system performance will be due to too little or too much charge. And in
many cases, this will be the last item suspected.
With the system started
After following instructions on the previous page on initial Charging for Systems with
Head Pressure Control, with refrigerant tank now connected to suction line (low side) port
to add remaining charge in a gas state, refer to the provided charts for proper system
operating points as equated to ambient temperature with wine cellar at normal conditions of
14 degrees C / 55%RH. Refer to Split Systems Operations chart on page 60 for system
pressures, sub-cooling, and superheat values to allow you to charge your system correctly.
In addition to using the charts provided, there is a liquid line moisture/sight glass located in
the condensing (outdoor) unit that will assist you in knowing that you have sufficiently
charge your system, HOWEVER a full sight glass or a glass with bubbles does not
necessarily mean you are properly charged, or undercharged. There may be other factors
affecting sight glass, so do not charge by sight glass method only. A full sight glass-
matched with proper system pressures, sub-cooling, and superheat values is the proper
method for confirming that the system charge is correct for your application.