International comfort products CAS090 G Series Installation Instructions Manual page 14

Thermostat —
Install an approved accessory thermostat according to
installation instructions included with the accessory.
Locate the thermostat accessory on a solid wall in the
conditioned space to sense average temperature in
accordance with the thermostat installation instructions.
The CAS090*G/H unit is a single- - circuit, two- - stage
cooling unit. Select a two- - stage cooling thermostat, with
or without supplemental heating, as needed.
(Note 2)
(Note 2)
(Note 1)
Note 1: Connect only if thermostat requires 24-vac power source.
Note 2: Connect W1 and W2 if supplemental heaters are installed
Field Wiring
Fig. 14 - - Typical Remote Thermostat Connections
Select a thermostat cable or equivalent single leads of
different colors with minimum
CAS090*G/H units. Check the thermostat installation
instructions for additional features which might require
additional conductors in the cable.
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of five leads for
Specifications are subject to change without notice.
For wire runs up to 50 ft. (15 m), use no. 18 AWG
(American Wire Gage) insulated wire (35C minimum).
For 50 to 75 ft. (15 to 23 m), use no. 16 AWG insulated
wire (35C minimum). For over 75 ft. (23 m), use no. 14
AWG insulated wire (35C minimum). All wire sizes
larger than no. 18 AWG cannot be directly connected to
the thermostat and will require a junction box and splice
at the thermostat.
If the unit will be operating at 208-3-60 power, remove
the black wire (BLK) from the transformer primary
connection labelled "230" and move it to the connection
labelled "208". See Fig. 15.
Fig. 15 - - Control Transformer Wiring
External Devices —
The CAS090 control transformers provide 24- - v NEC Class
2 power sources to energize external control devices. These
devices will include the indoor fan motor contactor (or
control relay). These devices may also include liquid line
solenoid valve, economizer control relay, supplemental
electric heater contactors or control relays and other devices
selected by system designer.
Control transformer TRAN1 provides control power through
terminal R to C on the field connection terminal strip TB for
supply fan motor interlock. This source may also be used to
energize economizer control relay and electric heater
contactors or relays. Maximum available power is 20 va.
Check concurrent loadings by external control devices. If the
maximum concurrent loading exceeds 20 va, purchase and
install the accessory Transformer- - Relay package (available
for 208/230 and 460- - v units).
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