Bryant 538J-18-1 manual IV. Make Electrial Connections, Accessory Installation

B. Make Piping Sweat Connections

Remove plastic caps from liquid and suction service valves. Use refrigerant grade tubing. Service valves are closed from the factory and ready for brazing. After wrapping the service valve with a wet cloth, the tubing set can be brazed to the service valve using either silver bearing or non-silver bear- ing brazing material. Consult local code requirements. Refrigerant tubing and indoor coil are ready for leak testing.

NOTE: Unit is shipped with a full factory charge of R-22 refrigerant as indicated on nameplate.

Pass nitrogen or other inert gas through piping while braz- ing to prevent formation of copper oxide.

CAUTION: To avoid damage while brazing, service valves should be wrapped in a heat-sinking material such as a wet cloth.

CAUTION: When brazing tubing sets to the ser- vice valves, a brazing shield must be used to prevent damage to the painted unit surface.

C. Provide Safety Relief

A fusible plug is located in unit suction line; do not cap this plug. If local code requires additional safety devices, install as directed.

IV. MAKE ELECTRIAL CONNECTIONS

WARNING: Unit cabinet must have an uninter- rupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to the unit ground lug in control compart- ment, or conduit approved for electrical ground when installed in accordance with NEC, ANSI/NFPA (Ameri- can National Standards Institute/National Fire Protec- tion Association) 70, and local electrical codes. Failure to follow this warning could result in the installer being liable for personal injury to others.

CAUTION: Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation will invalidate any appli- cable warranty.

A. Power Wiring

Unit is factory-wired for voltage shown on nameplate. Pro- vide adequate, fused disconnect switch within sight of unit, readily accessible but out of reach of children. Provision for locking the switch open (off) is advisable to prevent power from being turned on while unit is being serviced. Disconnect

switch, fuses, and field wiring must be in compliance with NEC (U.S.A. Standard) and applicable local codes. Use mini- mum 60 C wire for field power connection.

Route power wires through opening in the unit side panel and connect in unit control box as shown on unit label dia- gram and Fig. 5 and 6. Unit must be grounded.

B. Control Circuit Wiring

Control voltage is 24 v. See Fig. 5 and unit label diagram for field-supplied wiring details. Route control wire through opening in the unit side panel to connection in unit control box.

NOTE: 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. For more than 75 ft (23 m), use no. 14 AWG insulated wire. See Table 2 for conversion to European wire sizes.

NOTE: Operation of unit on improper line voltage constitutes abuse and could affect any applicable warranty. See Table 3. Do not install unit in system where voltage may fluctuate above or below permissible limits.

See Table 3 for recommended fuse sizes. When making elec- trical connections, provide clearance at unit for refrigerant piping connections.

Use indoor unit transformer as 24-v (40-va minimum) supply for system as shown in Fig. 5 or use accessory transformer.

WARNING: Before performing service or mainte- nance, be sure the indoor unit main power switch is off and indoor blower has completely stopped. Failure to do so may result in electrical shock or injury from rotating fan blades.

C. Connections to Duct-Free Fan Coil Units

The 538J units are designed for easy match-up to 619C, 619F, 619ENX018 and 619ENX024 duct-free fan coils. These units provide 24-v power for the outdoor unit from the fan coil. Connect the Y and C terminals of the indoor unit to the blue and brown wires of the outdoor unit with 20 gage (mini- mum) thermostat wire.

V. ACCESSORY INSTALLATION

Install all unit accessories per accessory installation instruc- tions prior to start-up.

Do not use accessory Time Guard® II device when combining a 538J unit with 619E indoor units.

When ambient temperature will fall below 55 F (13 C), acces- sory low ambient controller (part no. 53DS900060) is required. When accessory low ambient kit is used, unit should also be equipped with accessory winter start kit and field-fabricated wind baffles.

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