A. ROUTE GROUND AND POWER WIRES
Remove access panel to gain access to unit wiring. Extend wires from disconnect through power wiring hole provided and into unit control box.
WARNING: The unit cabinet must have an uninter- rupted or unbroken ground to minimize personal injury if an electrical fault should occur. The ground may consist of electrical wire or metal conduit when installed in accordance with existing electrical codes. Failure to follow this warning can result in an electric shock, fire, or death.
B. 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. 9.
XI. START-UP
CAUTION: To prevent compressor damage or personal injury, observe the following:
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pressure.
•Do not disable
•Dome temperatures may be hot.
CAUTION: To prevent personal injury wear safety glasses, protective clothing, and gloves when handling refrigerant and observe the following:
• Back seating service valves are not equipped with Schrader valves. Fully back seat (counter clockwise) valve stem before removing gage port cap.
•Front seating service valves are equipped with Schrader valves.
DISCONNECT
PER N. E. C. AND/OR LOCAL CODES
FIELD POWER
WIRING
FIELD GROUND
WIRING
CONTACTOR
GROUND
LUG
A91056
CAUTION: Federal regulations require that you do not vent refrigerant to atmosphere. Recover during system repair or final unit disposal.
Follow these steps to properly start up the system:
1. | After system is evacuated, fully back seat (open) liquid and |
| vapor service valves. |
2. | Unit is shipped with valve stem(s) front seated (closed) and |
| caps installed. Replace stem caps after system is opened to |
| refrigerant flow (back seated). Replace caps |
Fig. 9—Line Power Connections
C. CONNECT CONTROL WIRING
Route 24v control wires through control wiring grommet and connect leads to control wiring. (See Fig. 10.)
Use No. 18 AWG
All wiring must be NEC Class 1 and must be separated from incoming power leads.
Use furnace transformer, fan coil transformer, or accessory trans- former for control power, 24v/40va minimum.
NOTE: Use of available 24v accessories may exceed the mini- mum
IX. 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 50 ft. Refer to the Application Guideline and Service
X. INSTALL ELECTRICAL ACCESSORIES
Refer to the individual instructions packaged with kits or acces- sories when installing.
| tighten with wrench an additional 1/12 turn. |
3. | Close electrical disconnects to energize system. |
4. | Set room thermostat at desired temperature. Be sure set |
| point is below indoor ambient temperature. |
5. | Set room thermostat to COOL and fan control to ON or |
| AUTO mode, as desired. Operate unit for 15 minutes. |
| Check system refrigerant charge. |
A. SEQUENCE OF OPERATION |
Turn on power to indoor and outdoor units. Transformer is energized.
On a call for cooling, thermostat makes circuits
When thermostat is satisfied, its contacts open,
If indoor unit is equipped with a
XII. CHECK CHARGE
A. UNIT CHARGE
Factory charge and charging method are shown on unit informa- tion plate. Puron® refrigerant cylinders contain a dip tube which allows liquid refrigerant to flow from cylinder in upright position. Charge Puron® units with cylinder in upright position and a
NOTE: Charge must be adjusted in accordance with unit rating plate, ±0.6 oz/ft of