Section 6
Service
6-13
Charging Procedures
Important
The charge is critical on all Manitowoc ice
machines. Use a scale to ensure the proper charge
is installed. A quick disconnect is required for
the high side connection
1.
Be sure the toggle switch is in the OFF position.
Charging Connections
REFRIGERANT CHARGE
Important
This unit is critically charged.
Refrigerant
Air-Cooled
R134a
165g ( 5.78 oz.)
2.
Close the vacuum pump valve and the low side
manifold gauge valve.
3.
Open the high side manifold gauge valve.
4.
Using a digital scale add the proper refrigerant
charge (shown on nameplate) through the high
side.
5.
Close/isolate the refrigerant cylinder.
6.
Let the system “settle” for 2 to 3 minutes.
7.
Place the toggle switch in the ICE position.
8.
Close the high side on the manifold gauge set.
NOTE: Manifold gauges must be removed properly
to ensure that no refrigerant contamination or loss
occurs. A quick disconnect is required for the high
side connection unless high side valve has shut off.
9.
Make sure that all of the vapor in the charging
hoses is drawn into the ice machine before
disconnecting the charging hoses.
A.
Disconnect the water pump.
B.
Run the ice machine in the freeze cycle.
C.
Close the high side piercing valve (if
required) and remove the high side hose
with the quick disconnect.
D.
Open the high and low side valves on the
manifold gauge set. Any refrigerant in the
lines will be pulled into the low side of the
system.
E.
Allow the suction pressure to reach 6.89
kPA (0 psi) while the ice machine is in the
freeze cycle.
F.
Using a pinch-off tool, pinch off the high
and low side process tubes and remove both
piercing valves.
G.
Using an oxygen/acetylene torch seal the
penetrations from the piercing valves.
Important
Remove piercing valves after charging. Unit is
critically charged.
HIGH SIDE
SERVICE
VALVE
LOW SIDE
SERVICE
VALVE
OPEN
CLOSED
MANIFOLD SET
CLOSED
VACUUM PUMP/
RECOVERY UNIT
CHARGING
SCALE
SV1404B
