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3 Thermostat type If you are planning to convert your ice
box into a freezer, or as a spillover
system, a freezer thermostat (0021)
must be used.
4 Evaporator type & size If the evaporator has an even coating of
frost, the thermostat is set on 7, & the
system is cycling, the evaporator may
be too small. Either replace the
evaporator with a larger model, add
insulation to the bottom of the box to
reduce volume, or re-locate the
evaporator lower in the box. The latter
may cause the temperature at the top of
the box to be above acceptable levels.
5 Excessive frost build-up If an excessive layer of frost is allowed
to build up on the evaporator it will act
as an insulator & adversely affect box
temperatures. Defrost system by
interrupting power supply at the breaker
panel or by turning thermostat to the off
position. Restore power or reset
thermostat when evaporator is free of
frost.
Never use any implement in an
attempt to loosen the frost on the
aluminum evaporator. A light frost is
acceptable.
6 Incorrect refrigerant
charge
If, after the compressor has been
running for an appreciable length of
time, the evaporator surface does not
have an even coating of frost, or it is
only cold & sweating to the touch, the
system may be low on refrigerant or
over-charged. Consult a marine
refrigeration specialist.
7 Drain left unplugged If your ice-box is equipped with a drain
in the bottom of the box, it is suggested
that you block it off to prevent heat
loss. The drain should only be used if
you revert to melting ice, or after a
major clean-up.
8 Tubing hole left
unplugged
The hole that had been drilled to allow
the copper tubes on the evaporator to
pass through during installation must be
sealed.