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Model 700 Series -40C _______________________________________________________________________Maintenance
Vacuum Relief Port Maintenance
Observe the inner side
of port with each door
opening for frost and ice
build-up. Remove any frost
with a soft dry cloth. If the
tube should become
clogged with ice, it must be
cleaned. Make sure dur-
ing cleaning that the vac-
uum relief tube is com-
pletely free of ice to pre-
vent rapid ice formation.
Other factors that can
affect the performance of
the vacuum relief port
include: high ambient tem-
perature, high humidity
conditions and frequent
door openings.
Maintenance should be per-
formed weekly, or as needed.
Failure to maintain the vacuum relief port may result in
excessive ice build up inside the tube, clogging the port, and
inability to open the door. The vacuum relief port may need to
be cleaned more often with frequent door openings and high
humidity environments.
4.7 Replacing the Battery(s)
1. To gain access to the battery, open the lower door by
grasping the bottom left corner. The battery is rectangu-
lar in shape, located on the front left corner of the com-
pressor compartment and is secured in place by a
mounting bracket.
2. Directly above the battery(s) is the battery power switch.
Turn the battery power switch to the off position (O).
3. Disconnect the battery connections.
4. Remove the old battery and install the new battery.
6. Reconnect the battery (red to positive and black to nega-
tive).
7. Turn the battery power switch to Standby mode ( ).
8. Close lower panel door.
Figure 4-4
4 - 3
Battery power
switch
Thermocouple
receptacle
Battery mounting
bracket
Figure 4-5
The % of charge can vary depending on the age,
usage and condition of the battery. For a consistent
and dependable charge, replace the battery every 2
years. Replacement batteries must be rechargeable
and are available from Thermo. Refer to the parts
list for stock number and description of the
replacement batteries. Dispose of the used batteries
in a safe manner and in accordance with good
environmental practices.
4.8 Preparing the Unit for Storage
Defrost the unit as described in Section 4.4. This will pre-
pare the unit for storage. Turn off the battery power switch (O).
Turn off the freezer power switch. Disconnect power to the bat-
tery(s) and to the freezer.
If the unit has been in service, turn it off and dis-
connect the power cord connector before proceed-
ing with any maintenance.
O
Freezer battery
and optional BUS battery
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