Replacing Refrigeration System Components; Steps To Recover Refrigerant; Charging - Hussmann microSC SHM-A Series Installation & Operation Manual

2-4 ELECTRICAL / REFRIGERATION
REPLACING REFRIGERATION SYSTEM
COMPONENTS
Only Hussmann service technicians or
technicians qualified to handle R-290
(propane) refrigerant should service or
repair this R-290 (propane) equipment
Failure to follow instructions can result
in an explosion, death, injury and
property damage.

STEPS TO RECOVER REFRIGERANT

1. Make sure you are in a well ventilated area be-
fore making any service or repair to the refriger-
ation system.
2. Disconnect all power sources from the system.
Some systems may have more than one plug or
power supply.
3. Tap system with line tap valves, attaching gauges to
the high and low sides of the system.
4. Connect hose to an evacuated recovery tank.
Open refrigeration gauges and recovery tank.
5. With the suction valve in vacuum, the refrigerant will
be recovered into the recovery tank.
6. Once recovered, close the tank valve and remove
the guage from the tank and connect nitrogen tank
to the system to purge it with nitrogen.
P/N 3104942_B
refrigeration
line tapping
valve
U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
7. Pull vacuum to a minimum of 200 microns or
lower.

CHARGING

A calibrated scale with +/-2 gram accuracy
must be used to charge the system. The charge
amount is shown on the serial plate. Only R-290
grade refrigerant can be used. Standard propane
does not meet the purity/moisture content of
R-290, and therefore cannot be used to charge
cases.
No gas charge adjustments are allowed. When
connecting hoses between the refrigeration
system, manifold gauges, and refrigerant
cylinder, ensure that the connections are secure
and there are no potential sources of ignition
nearby. Ensure that contamination of different
refrigerants does not occur when using charging
equipment.
— LOCK OUT / TAG OUT —
To avoid serious injury or death from electri-
cal shock, always disconnect the electrical
power at the main disconnect when servicing
or replacing any electrical component. This
includes, but is not limited to, such items as
doors, lights, fans, heaters, and thermostats.