Bryant Durapac Plus Series 551a User Manual

Page 12

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Table 4 — Heat Anticipator Settings

*Heater kW is based on heater voltage of 208 v, 240 v, or 480 v.

VIII. STEP 8 — INSTALL OUTDOOR-AIR HOOD

The same type of factory-installed hood is used on units with
25% air ventilation and units with an EconoMi$er.

NOTE: The hood top panel, upper and lower filter retainers,
hood drain pan, baffle (180-240), and filter support bracket
are secured opposite the condenser end of the unit. The
screens, hood side panels, remaining section of filter support
bracket, seal strip, and all other hardware are in a package
located inside the return-air filter access panel (Fig. 18).

1. Attach seal strip to upper filter retainer. See Fig. 19.

2. Assemble hood top panel and side panels, upper filter

retainer, and hood drain pan (Fig. 20).

3. Secure lower filter retainer and long section of filter

support bracket to unit. See Fig. 20. Leave screws
loose on size 180 and 240 units.

4. Slide baffle (size 180 and 240 units) behind lower fil-

ter retainer and tighten screws.

5. Loosen sheet metal screws for base unit top panel

located above outdoor-air inlet opening, and remove
screws for hood side panels located on the sides of the
outdoor-air inlet opening.

6. Match notches in hood top panel to unit top panel

screws. Insert hood flange between unit top panel
flange and unit. Tighten screws.

7. Hold hood side panel flanges flat against unit, and

install screws removed in Step 5.

8. Insert outdoor-air inlet screens and spacer in channel

created by lower filter retainer and filter support
bracket.

9. Attach remaining short section of filter support

bracket.

A. Outdoor Air Enthalpy Sensor Installation

Perform the following procedure to install the outdoor air
enthalpy sensor (part no. CROUTENT001A00).

1. Remove the outdoor air temperature sensor cover.

See Fig. 21. Save cover and screws.

2. Disconnect the wiring from the installed outdoor air

temperature sensor. See Fig. 22.

3. Use a

-in. nut driver to remove the 2 screws secur-

ing the outdoor air temperature sensor to the sheet
metal.

4. Mount the outdoor air enthalpy sensor in the outdoor

air temperature sensor location using the screws
removed in Step 3.

5. Connect the outdoor air enthalpy sensor wiring har-

ness to the EconoMi$er control module and sensor.

6. Re-install sensor cover saved from Step 1.

B. Return Air Temperature Sensor or Return Air Enthalpy
Sensor Installation

Perform the following procedure to install the return air
temperature sensor (part no. CRRETTMP001A00) or return
air enthalpy sensor (part no. CRRETENT001A00).

1. Attach the sensor to the mounting bracket using

2 self-tapping

-in. screws provided.

2. Mount the bracket to the inside of the return air

opening flange using a

-in. nut driver and 2 no.

6 sheet metal screws.

NOTE: The sensor must be mounted in an upright position.

3. Feed the sensor wiring through the bushing in

EconoMi$er to secure wires.

4. Route sensor wiring harness from sensor to

EconoMi$er control module. Secure wiring harness to
the original harness using tie wraps.

5. Wire the sensor to the EconoMi$er control module.

See Fig. 23 and 24.

UNIT
551A

UNIT

VOLTAGES

kW*

STAGE 1

STAGE 2

155-240

208/230-3-60

14/19

.40

—

26/34

.40

.66

42/56

.66

.40

56/75

.66

460-3-60

.40

.66

Fig. 16 — EconoMi$er Control Module

Adjustment Potentiometers

CONTROL MODULE

ACTUATOR

Fig. 17 — EconoMi$er Control Module Location

Fig. 18 — Outdoor-Air Hood Component Location