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C4H5S, H4H5S, T4H5S: Installation Instructions
Connect Ground and Power Wires
Connect ground wire to ground connection in control box for safety.
Connect power wiring to contactor as shown in
Fig. 7 – Line Power Connections
Connect Control Wiring
Route 24-v control wires through control wiring grommet and connect
leads to control wiring. See Thermostat Installation
Instructions for wiring specific unit combinations.
Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If
thermostat is located more than 100 ft. (30.48 m) from unit, as measured
along the control voltage wires, use No. 16 AWG color-coded, insulated
wire to avoid excessive voltage drop.
All wiring must be NEC Class 2 and must be separated from incoming
power leads.
Use furnace transformer, fan coil transformer, or accessory transformer
for control power, 24V/40VA minimum.
NOTE: Use of available 24V accessories may exceed the minimum
40VA power requirement. Determine total transformer load and increase
the transformer capacity or split the load with an accessory transformer
as required.
Final Wiring Check
IMPORTANT: Check factory wiring and field wire connections to
ensure terminations are secured properly. Check wire routing to ensure
wires are not in contact with tubing, sheet metal, etc.
Compressor Crankcase Heater
When equipped with a crankcase heater, furnish power to heater a
minimum of 24 hr before starting unit. To furnish power to heater only,
set thermostat to OFF and close electrical disconnect to outdoor unit.
A crankcase heater is required if refrigerant tubing is longer than 80 ft.
(24.38 m). Refer to the Long Line Applications Guideline.
Install Electrical Accessories
Refer to the individual instructions packaged with kits or accessories
when installing.
Check OAT Thermistor and OCT Thermistor
Attachments
Outdoor Air Temperature (OAT) Thermistor is factory installed by
inserting the nibs on either sides of the thermistor body through a
keyhole in the bottom shelf of the control box and locking it in place by
turning it 90 degrees, such that the spherical end of a nib faces the front
of the control box.
Check to make sure the OAT is locked in place
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig.
7.
The Outdoor Coil Temperature (OCT) Thermistor is factory installed on
A91056
the 3/8" diameter stub tube located on the coil assembly. Check to make
sure that it is securely attached with the clip as shown in
Start-Up
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal injury,
equipment damage or improper operation.
To prevent compressor damage or personal injury, observe the
following:
(Fig.
8).
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Wear safety glasses, protective clothing, and gloves when handling
refrigerant and observe the following:
6
Fig. 8 – Outdoor Air Thermistor (OAT) Attachment
Fig. 9 – Outdoor Coil Thermistor (OCT) Attachment
CAUTION
!
-
Do not overcharge system with refrigerant.
-
Do not operate unit in a vacuum or at negative pressure.
-
Do not disable low pressure switch in scroll compressor
applications.
-
Dome temperatures may be hot.
CAUTION
!
-
Front seating service valves are equipped with Schrader valves.
A150065
Fig.
9.
A05408
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