Bryant 551B installation instructions Field Control Wiring, Heat Anticipator Settings

B. Field Control Wiring

Install a Bryant-approved accessory thermostat assembly according to installation instructions included with the accessory. Locate thermostat assembly on a solid wall in the conditioned space to sense average temperature in accor- dance with thermostat installation instructions.

Route thermostat cable or equivalent single leads of colored wire from subbase terminals to low-voltage connections on unit (shown in Fig. 9) as described in Steps 1 through 4 below.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American Wire Gage) insulated wire (35 C minimum). For 51 to 75 ft, use no. 16 AWG insulated wire (35 C minimum). For over 75 ft, use no. 14 AWG insulated wire (35 C minimum). All wire larger than no. 18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat.

1.If mounted on a roof curb and electrical power is to be run through the basepan, an accessory thru-the- bottom connection kit is required. This is available through the local Bryant distributor. This kit is required to ensure a reliable water-tight connection.

2.If unit is mounted on roof curb and accessory thru- the-bottom service connections are used, route wire through connections.

3.Pass control wires through the hole provided on unit (see connection D in Connection Sizes table in Fig. 7).

4.Feed wire through the raceway built into the corner post to the 24-v barrier located on the left side of the control box. See Fig. 9. The raceway provides the

UL required clearance between the high-voltage and low-voltage wiring.

5.Connect thermostat wires to screw terminals of low- voltage connector (see Fig. 9).

NOTE: If thru-the-bottom power connections are used refer to the accessory installation instructions for information on power wiring. Refer to Fig. 7 for drilling holes in basepan.

C. Heat Anticipator Settings

For units with electric heat, set heat anticipator settings as shown in Table 4.

VI. STEP 6 — ADJUST FACTORY-INSTALLED OPTIONS A. Disconnect Switch

The optional disconnect switch is non-fused. The switch has the capability of being locked in place for safety purposes.

B. Perfect Humidity™ Dehumidification System

Perfect Humidity system operation can be controlled by field installation of a Bryant-approved humidistat (Fig. 11), or light commercial Thermidistat™ device (Fig. 12). To install the humidistat:

1.Route humidistat cable through hole provided in unit corner post.

2.Feed wires through the raceway built into the corner post to the 24-v barrier located on the left side of the control box. See Fig. 10. The raceway provides the UL-required clearance between high-voltage and low- voltage wiring.

COOL STAGE 1	Y1/W2
FAN	G
HEAT STAGE 1	W/W1
COOL STAGE 2	Y/Y2
HEAT STAGE 2	O/W2
24 VAC HOT	R
24 VAC COM	C
N/A
OUTDOOR AIR	S1
SENSOR	S2

R

G

Y1

Y2

W1

W2

C

IPD/X

WIRE CONNECTIONS TO LOW-VOLTAGE SECTION (CONNECTION BOARD)

CONNECTION

BOARD

FACTORY- INSTALLED DISCONNECT

(OPTION)

RACEWAY

COMPRESSOR

NO. 2

COMPRESSOR

NO. 1

CONVENIENCE OUTLET (OPTION)

THERMOSTAT DIPSWITCH SETTINGS

ON

OFF

A B C D

LEGEND

Field Wiring

NOTE: Underlined letter indicates active thermostat output when configured for A/C operation.

Fig. 9 — Low-Voltage Connections

HOLE IN

END

PANEL

Fig. 10 — Field Control Wiring Raceway

Table 4 — Heat Anticipator Settings

							UNIT VOLTAGE
		208/230						460						575
UNIT	Heater		Configuration			Heater			Configuration			Heater			Configuration
				2-Stage						2-Stage						2-Stage
	kW*	1-Stage				kW	1-Stage					kW	1-Stage
				Stage 1	Stage 2					Stage 1	Stage 2				Stage 1		Stage 2
	10.4, 16.0	0.3		NA	NA	13.9, 16.5	0.3			NA	NA	17.0, 34.0	0.3		NA		NA
551B	24.8, 32.0	0.6		0.3	0.3	27.8, 33.0
	42.4, 50.0	0.9		0.6	0.3	41.7, 50.0	0.6			0.3	0.3	51.0	0.6		0.3		0.3

*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v or 575 v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.

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