14
FORM CIM 0203
PACKAGE UNIT
If the unit is to be installed as an integral (close-
coupled) unit, low voltage (thermostat) wiring is to
be brought through connection , Figures 5 and 7,
and power wiring will be brought through connec-
tion , Figures 5 and 7. See unit specification plate
(Item , Figure 7, page 7) for power wiring mini-
mum circuit ampacity and maximum fuse size.
SPLIT SYSTEM
If the unit is split (condensing unit remote from evapo-
rator), the thermostat wiring is to brought through con-
nection , Figures 5 and 7. Power wiring for the con-
densing unit is to be brought through connection
, and the power wiring for the evaporator through
connection . Interconnecting low voltage wiring will
be brought through and to replace those discarded
when separating the unit.
Power wiring to the condensing and evaporator units
must be wired through circuit breakers or service
disconnects. Minimum circuit ampacity and maxi-
mum fuse sizes for the condenser unit are shown on
the condenser unit specification plate. Refer to speci-
fication plate (Item , Figure 7, page 7) for evapo-
rator minimum circuit ampacity and maximum fuse
size per the National Electric Code.
DUCT CONNECTION
It is recommended to use a flex collar or other means
to isolate any unit vibration from being transmitted to
the duct or structure.
Ductwork and plenums shall be insulated in accor-
dance with applicable ASHRAE standards or local
codes.
PRESSURE SWITCHES
High Pressure
This switch shuts the unit down in the event of ex-
cessive high pressure in the discharge line.
Low Pressure
This switch shuts the unit down in the event of ex-
cessive low pressure in the suction line.
NOTE: Pressure switches are connected to
lock out relays. If the unit goes off on high
or low pressure, the lock-out relays must be
reset by switching the thermostat to the
“OFF” position and then back to the
“COOL” position. Not on Marvel Systems.
NOTE: Microprocessor controlled units do
not incorporate a lock out relay. After resolv-
ing the high or low pressure situation reset
the microprocessor as required. Consult
seperate manual for microprocessor control.
WATER-COOLED CONDENSING
UNITS
Water Cooled Condenser
The condenser is a tube-in-tube, chemically-cleanable
configuration. The inner tube carries the water and
the outer tube the refrigerant.
Figure 16:
Water Regulating Valve
633AR
Summary of Contents for 4CA1901
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