Emerson Liebert SRC Series, User Manual

Page: 41 / 124

Installation
31 Liebert
®
SRC™ User Manual
3. Refer to 5.0 - Piping , to continue with the piping connections to the indoor unit.
– or –
Refer to 6.0 - Electrical Connections , to continue with the conduit/electrical wiring to the indoor unit.
Figure 3-17 Rear view of indoor unit
3.5 Pump Down Procedure
This procedure is performed when a unit must be relocated or the refrigerant circuit is serviced. “Pumping
down” is a term that means collecting all refrigerant into the outdoor unit without the loss of any refrigerant.
Use the following procedure to safely collect refrigerant back into the outdoor unit. Always adhere to and
be familiar with local codes regarding the handling of refrigerant.
The system must be placed in Cooling mode to proceed with the pump-down procedure. Refer to 8.3 -
Enabling Cooling-only Mode , for the steps.
1. Connect a low-pressure gauge with manifold hose to the charge port on the gas-line service valve.
2. Open the gas-line service valve half-way.
!
CAUTION
Risk of inhalation of refrigerant gas. Can cause illness and injury.
Never air purge with refrigerant as it can cause refrigerant leakage.
NOTE
Use a vacuum pump that can evacuate down to 500 microns.
1. If moisture remains in the piping after the system is evacuated for
2 hours, break the vacuum (down to 7.5 psi with nitrogen gas).
2. Evacuate the system again with the vacuum pump for at least 1 hour to
500 microns.
3. If the system does not reach 500 microns within 2 hours, repeat the
vacuum break and evacuation procedure until the gauge does not rise.
!
CAUTION
Risk of exposure or contact with refrigerant. Can cause injury and illness.
Refrigerant is toxic and too cold for safe human contact. Do not inhale or handle refrigerant
directly.
NOTE
Perform pump-down procedure only in cooling mode.
Installaon Plat e
Drain Hose
Drain Hose Holder