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Be sure that all service valves are open to al-
low all of the mixture to be discharged.
b. Connect a deep-drain vacuum pump to
both the high and low side of the system.
Pull a vacuum on the system to at least
15 00 microns.
c. Break the vacuum by adding refrigerant
into the system until the pressure is above
0 psig. Always charge the refrigerant line
into the system through a new drier in the
charging manifold line. A 16 cubic inch
drier is sufficient for this purpose.
d. Repeat steps 2 and 3 two more times, the
third time evacuating the system to 500
microns.
The following pressures are optimum
when the cas e in a 75º to 80ºF ambient and is
running from 35º to 40ºF cabinet tempera-
ture and are for reference only:
MODEL NO. REFRIGERANT SUCTION PRESSURE HEAD PRESSURE
TYPE (psig) (psig)
GSVM4060 R-134a 12-15 130-150
GSVM4072 R-134a 12-15 130-150
GSVM5272 R-134a 14-18 130-150
GSVM5272 R-404A 40-50 310-320
Consult the serial plate for the correct refrigerant charge. This charge is critical and
should be weighed in.
TEMPERATURE CONTROL –
The temperature control is located in
the electrical box. The sensing bulb is lo-
cated on the left hand end of the lower back
wall.
When replacing make sure the bulb
is in the proper location and that the hole in
the liner is properly sealed after the replace-
ment has been made.
The control is adjustable from –30º to 50ºF
(dial face marking). The actual cabinet tem-
perature is approximately 6 to 9º warmer
than the control setting so this must be
taken into consideration.
The control also has an adjustable differen-
tial that determines the difference between
the cut-in and cut-out temperature. This is
adjustable from 5 to 20º. The factory set-
ting is from 8-10º to insure proper off time
to keep the evaporator from icing.
EVAPORATOR FAN MOTORS
–
To replace an evaporator fan motor,
the product must be removed from the
cabinet and the bottom shelf also removed.
Next, remove the plate covering the
fans by removing the 2 screws, and 4 bolts
holding this in place. The fans are now ac-