Carrier 69NT40-511-1 Operating And Service Manual page 96

CAUTION
To prevent trapping liquid refrigerant in the
service valve after charging, perform the
following steps while the compressor is ON
and before disconnecting the manifold
gauge set:
Backseat applicable discharge or manual
S
liquid line valve.
Midseat manifold gauge set hand valves.
S
Allow the gauge set to pull down to suction
S
pressure.
T-268-07
b. Removing the Manifold Gauge Set
1. While the compressor is still ON, backseat the
discharge service valve.
2. Midseat both hand valves on the manifold gauge set
and allow the pressure in the manifold gauge set to
be drawn down to suction pressure. This enables the
liquid that condensed in the high side hose to be
returned to the system.
3. Backseat the suction service valve. Backseat both
field service couplings, and remove the couplings
from the service ports.
4. Install both service valve stem caps and service port
caps (finger-tight only).
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