Bryant 187B installation instructions Make Electrical Connections

Refer to Fig. 3 and install filter drier as follows:

1.Braze 5-in. liquid tube to the indoor coil.

2.Wrap filter drier with damp cloth.

3.Braze filter drier to above 5-in. (127 mm) liquid tube. Flow arrow must point towards indoor coil.

4.Connect and braze liquid refrigerant tube to the filter drier.

		A05178
		Fig. 3 - Liquid Line Filter Drier
/ 180B	Evacuate Refrigerant Tubing and Indoor Coil
	!	CAUTION
187B	UNIT DAMAGE HAZARD
	Failure to follow this caution may result in equipment
	damage or improper operation.

Never use the system compressor as a vacuum pump.

Refrigerant tubes and indoor coil should be evacuated using the recommended deep vacuum method of 500 microns. The alternate triple evacuation method may be used (see triple evacuation procedure in service manual). Always break a vacuum with dry nitrogen.

Deep Vacuum Method

The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a vacuum gage capable of

Make Electrical Connections

Be sure field wiring complies with local and national fire, safety, and electrical codes, and voltage to system is within limits shown on unit rating plate. Contact local power company for correction of improper voltage. See unit rating plate for recommended circuit protection device.

NOTE: Operation of unit on improper line voltage constitutes abuse and could affect unit reliability. See unit rating plate. Do not install unit in system where voltage may fluctuate above or below permissible limits.

NOTE: Use copper wire only between disconnect switch and unit.

NOTE: Install branch circuit disconnect of adequate size per NEC to handle unit starting current. Locate disconnect within sight from and readily accessible from unit, per Section 440-14 of NEC.

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

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

The unit cabinet must have an uninterrupted 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.

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. 5.

accurately measuring this vacuum depth. The deep vacuum method is the most positive way of assuring a system is free of air and liquid water. A tight dry system will hold a vacuum of 1000 microns after approximately 7 minutes. See Fig. 4.

	5000
	4500
	4000	LEAK IN
MICRONS	3500
		SYSTEM
	3000
	2500

DISCONNECT

PER N. E. C. AND/OR LOCAL CODES

FIELD POWER

WIRING

FIELD GROUND

WIRING

CONTACTOR

GROUND

LUG

A91056

2000
							VACUUM TIGHT
1500
							TOO WET
1000
							TIGHT
500
							DRY SYSTEM
0	1	2	3	4	5	6		7
			MINUTES

A95424

Fig. 4 - Deep Vacuum Graph

Final Tubing Check

IMPORTANT: Check to be certain factory tubing on both indoor and outdoor unit has not shifted during shipment. Ensure tubes are not rubbing against each other or any sheet metal or wires. Pay close attention to feeder tubes, making sure wire ties on feeder tubes are secure and tight.

Fig. 5 - Line Connections

Connect Control Wiring

This unit is capable of communication with an Evolution Control, or will operate using standard 24v 2-stage thermostat. Route 24-v control wires through control wiring grommet and connect leads to control board. When an Evolution User Interface is available, connect A, B, C and D connections only. If a 2-stage thermostat is used, connect to the R, C, Y1, and Y2 connections. Refer to the wiring label to further clarification.

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 wire to avoid excessive voltage drop.

All wiring must be NEC Class 1 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 loading and increase the transformer capacity or split the load with an accessory transformer as required.

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