INSULATION
The suction and liquid lines should be clamped
or taped together and insulated for a minimum
of 30 ft (9144 mm) from the merchandiser.
Additional insulation for the balance of the liquid
and suction lines is recommended wherever con-
densation drippage is objectionable or the lines are
exposed to ambient conditions.
SUCTION LINE
•
Pitch in direction of flow.
•
May be reduced by one size at one third of
case run load and again after the second third.
Do not reduce below the case suction line size.
•
Case suction lines should enter at the top of the
branch line.
LIQUID LINE
•
May be reduced by one size after one half the
case run load. Do not reduce below the case
liquid line connection size.
•
Take-offs to case liquid lines should exit the
bottom of the branch liquid line. Provide an
expansion loop for each evaporator take-off.
(Minimum 3 in. (76 mm) loop.)
REFRIGERATION THERMOSTAT
The bulb for the optional refrigeration thermostat
is located approximately 12 in. (305 mm) above
the coil and 6 ft (1829 mm) from the left-hand end
(facing front) of the merchandiser. The optional
refrigeration thermostat is located 5 ft (1524 mm)
from the left-hand end, just past the raceway. On
wide island models, the thermostat body is located
on the serial plate side (front) of the merchandiser.
DEFROST TERMINATION THERMOSTAT
The standard disc type defrost termination
thermostat is not adjustable. This thermostat is
clamped to the suction line of the coil on the
left-hand (facing front) end of the merchan-
diser.
DEFROST SEQUENCES
The Time Clock initiates defrost. The evaporator
fans continue to circulate air across the evaporator
coil, melting any frost build-up. Defrost can be
terminated by either temperature or time.
Temperature Termination
Temperature termination should be used for the
following types of installations:
1. Parallel systems with EPRs or suction stop
solenoids
2. Single compressor units without pump-down
cycle.
Time Termination
Time termination should be used for the following
types of installations:
1. Parallel systems with thermostat and liquid
solenoid.
2. Single compressor units with pump-down.
To use time termination, simply do not wire the
termination thermostat.
Suction Line Return
Minimum Loop
3 in. (76 mm)
Liquid Line Take Off
