Bryant 548F User Manual download pdf (Page 13)

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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.

NOTE: If using Bryant electronic thermostat, set thermostat

configuration for “non-heat pump operation.” The use of the

O terminal is not required to energize the reversing valve in

this family of products.

Route thermostat cable or equivalent single leads of colored

wire from subbase terminals to low-voltage connections on

unit (shown in Fig. 7) as described in Steps 1 through 3

below.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American

Wire Gage) insulated wire (35 C minimum). For 50 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. Connect thermostat wires to screw terminals of low

voltage connection board.

2. Pass the control wires through the hole provided in

the corner post.

3. 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. 8. The raceway provides the UL-

required clearance between the high- and low-voltage

wiring.

C. Defrost Board

The defrost board timer is set for a 30 minute defrost cycle

from the factory. To adjust to a 50 or 90 minute cycle, remove

the wire connected to the 30 minute quick connect on the

defrost board. See Fig. 9. Connect lead to the 50 or 90 minute

quick connect on the defrost board, depending on the appli-

cation.

D. Heat Anticipator Settings

Set first-stage heat anticipator setting at 0.8 and set second-

stage heat anticipator setting at 0.3.

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.

The disconnect switch is only available for limited applica-

tions. See electrical data tables on pages 8-12 for disconnect

switch usage.

B. Optional Durablade Economizer

The optional economizer hood assembly is packaged and

shipped in the filter section. Damper blades and control

boards are installed at the factory and the economizer is

shipped in the vertical discharge position.

NOTE: Horizontal discharge block-off plate is shipped with

the air hood package. If unit is to be used for vertical dis-

charge application, discard this plate.

LEGEND

Fig. 7 — Low-Voltage Connections With or

Without Economizer or Two-Position Damper

AHA —

Adjustable Heat Anticipator

CC —

Cooling Compensator

Field Wiring

Factory Wiring

*Used with economizer.

†Used with 2-stage electric

heater.

†

Fig. 8 — Field Control Wiring Raceway

Fig. 9 — Defrost Board

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Bryant 548F User Manual Page 13

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