System Operation and Maintenance
SYSTEM CONTROLS AND OPERATION
Every installation is different. Your Glacier Bay system is delivered to you with the controls pre-
adjusted to “approximate” settings. These settings will generally give acceptable results but are
not optimized to achieve maximum efficiency. Optimizing control settings can only be done by
monitoring the system operation for an extended period of time. Therefore, it is the responsibility
of the owner to optimize these settings.
Introduction
Before undertaking adjustment of the controls, it is important to recognize that your Glacier Bay
holding plate system works very differently from a common “non-holding plate” system such as
your home refrigerator. In your home refrigerator, the compressor is turned on and off based on
the temperature of the air in the box. In your Glacier Bay system, the compressor is turned on
and off based on the state of the holding plate (ie. frozen or thawed). The temperature of the air
in the box is determined indirectly at the time the system is designed by the eutectic temperature
and surface area of the holding plates.
While this may seem a minor distinction at first glance, it is important that the owner does not
attempt to adjust the controls to achieve a particular box air temperature. In a properly
adjusted system, the compressor runs just long enough to freeze the holding plate(s)
completely solid then turns off until the plate(s) is completely thawed. The control system
is improperly adjusted if the compressor turns off before the plate(s) is 100% frozen or, if it
continues to run after it is 100% frozen. Similarly, the control system is maladjusted if it turns on
before the plate(s) is 100% thawed or, fails to turn on after it is 100% thawed.
An incorrectly adjusted system will often operate fine and maintain very acceptable box
temperatures. However, it will generally use more energy that one which is properly adjusted.
Basic Operation of System Priority
The Glacier Bay control system consists of the control board, digital thermostat(s) and high-
pressure cut-out.
Note: In multi-zone systems (ie. separate refrigerator and freezer compartments), the zones do
not pull-down simultaneously. Instead, the individual zones operate sequentially by priority with
the freezer plates freezing first and the refrigerator afterward.
A typical 3 zone system has the freezer as zone 1 (first priority), then the refrigerator as zone 2
(second priority), then the air conditioning as zone 3 (third priority). Another scenario might be
Freezer (zone 1), Freezer (zone 2), Refrigerator (zone 3), Air (zone 4). Be sure to use the
appropriate wiring diagram that was selected for your particular system’s configuration. The
wiring diagram is accompanied in the sleeve pocket of this manual.
Toggle switches are provided on the digital controls to enable the operator to turn individual
zones on and off. For example, if all of the food in the freezer is used up but you wish to
continue to run the refrigerator, simply switch the digital control for the Freezer to the “off”, or
down position. The refrigerator will continue to operate normally but the freezer will be allowed
to warm up thereby saving a considerable amount of energy.
Page 42
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