Bryant 548D installation instructions Unit Voltage, 208/230 460 575, Stage

Table 3 — 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
548D	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 and 575 v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.

Fig. 10 — Defrost Board

4.On size 120 units, install vertical discharge block-off plate over duct openings. See Fig. 13.

5.Economizer is factory-installed in unit and secured with screws. See Fig. 14.

NOTE: Be sure rear economizer flange is engaged under tabs in vertical return-air opening.

6.To convert to horizontal discharge application:

a.Rotate the economizer 90 degrees until the econ- omizer motor faces the outdoor section (see Fig. 15).

b.Remove shipping screw and tape from baromet- ric damper and rotate the barometric relief damper hinge 90 degrees. Barometric relief damper should open vertically to operate properly.

c.Install horizontal discharge block-off plate over the opening on the access panel. (Block-off plate MUST be installed before installing hood assem- bly.) See Fig. 16.

7.Remove existing 12-pin blue and yellow wire jumper plug and store. Insert 12-pin economizer plug into economizer harness. See Fig. 14.

8.If ventilation air is not required, proceed to Step 9. If ventilation air is required, determine the minimum position setting for required airflow. See Fig. 17.

Adjust minimum position setting by loosening the screws on the position setting bracket. See Fig. 18. Slide bracket until the top screw is in the position determined by Fig. 17. Tighten screws.

9.Remove tape and shipping screw from outdoor-air thermostat (OAT). Fas-ten OAT to inside of hood using screws and speed clips provided. See Fig. 19. Make sure OAT terminals are positioned up.

10.Replace outdoor-air opening panel using screws from Step 2. Replace filter access panel. Ensure the filter access panel slides along the tracks and is securely engaged.

11.Fasten hood top and side plate assembly to outdoor- air opening panel with screws provided.

12.Place knob supplied with economizer on OAT. See Fig. 19. Set for 3° F below indoor room thermostat setting. If accessory enthalpy control (EC) is used in place of OAT, see instructions shipped with EC for installation and adjustment. See Fig. 19.

13.Connect OAT per Fig. 20.

14.Slide outdoor-air inlet screen into screen track on hood side plate. While holding screen in place, fasten screen retainer to hood using screws provided.

NOTE: Refer to Fig. 21 for economizer barometric relief damper characteristics.

Fig. 11 — Panel Locations

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