Copyright 2013 HotSpot Energy
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Recharging the DC4812VRF
All DC4812VRF units are shipped from the factory fully charged for a lineset length up to 25 ft. However,
if the unit was shipped via air freight, due to air safety regulations the R410a will have been removed and
replaced with a low pressure nitrogen charge. If you need to recharge an uncharged unit for this or other
reason, the following instructions are provided.
Evacuation
Air and moisture in the refrigerant system have undesirable effects as indicated below:
- Damage to compressor and valves
- Pressure in the system rises.
- Operating current rises.
- Cooling or heating efficiency drops.
- Moisture in the refrigerant circuit may freeze and block capillary tubing.
- Water may lead to corrosion of parts in the refrigeration system.
The indoor unit and tubing between the indoor and outdoor unit must be leak tested and evacuated to
remove any non-condensables and moisture from the system before charging with R410A Freon.
Evacuation with vacuum pump
- Preparation
Check that each tube (both liquid and gas side tubes) between the indoor and outdoor units have been
properly connected and all wiring for the unit has been completed. Remove the service valve caps from
both the gas and the liquid side on the outdoor unit. Note that both the liquid and the gas side service
valves on the outdoor unit are kept closed at this stage.
Completely tighten the flare nuts, A, B, C, D. Figure 59
1. Using a R410A 1/4"M x 5/16"F Swivel Adapter, connect the manifold valve charge hose, (blue
hose) to the charge port of the low-pressure valve on the gas pipe side.
Use caution when handling the packed valve!
2. Open the valve stem until it hits against the stopper. Do not try to open it further. Replace and
securely tighten the valve stem cap with a wrench. Figure 60
