Bryant 394B User Manual

Bryant

Airconditioning Company

installation instructions

GAS-FIRED FORCED-

AIR FURNACE

39 4B &D

Series A

Sizes 050

thru 200

INTRODUCTION

Before installing the furnace, refer to “Procedure for Gas Furnace Installation” (packaged with the equip ment) for information concerning combustion, vent ing, piping, and other standard installation practices.

Further reference is made to the current edition of the American National Standard “Installation of Gas Appliances and Gas Piping,” Z21.30.

Model 394 Gas Furnaces are shipped from the factory

completely assembled and wired ready for indoor heating installation. They are manufactured with two types of blowers: belt and direct drive. The four

smaller sizes, 50, 80, 100, and 125, are direct drive

only. All sizes incorporate a low-voltage terminal

strip for convenience of field wiring (except 50,000-

Btuh unit with complete shut-off gas controls.)

This publication covers installation, startup and maintenance. For accessory installation details, refer to applicable installation literature.

CAL’TTON: Do Tiot insrall hirnace in a coitosívp or coiiTaminated almosphcre. Makp sure tliaV all local ordinance's for coinbusTioii and circiilaTing air supply are obser\ed.

Cancels: 39394D82

Figure 1—Modei 394D

39394DP85

11/1/74

A72548

The design of the 394B&D Upflow Gas-Fired Fur naces is A.G.A. certified for installation on com bustible flooring in alcoves, basements, closets, or utility rooms.

CLEARANCE REQUIREMENTS

(in inches)

Sides............................................................................1

Back.............................................................................0

Top of Plenum.............................................................1

Vent Connector (single wall)

Type B (double wall)...............................................1

Front........................................................................ ..6

Provide service clearance of 30 in. at front of unit.

Bryant Automatic Gas Controi Vaive

NOTE: On units equipped with an A-643 Bryant automatic gas control valve, there are three positions for the manual valve knob (OFF-PILOT-ON). There is a position stop at the PILOT position. To move the manual valve knob from the PILOT position to either ON or OFF position, the manual valve knob must be depressed.

......................................

If not already checked when lighting the main burn

er, check the proper operation of this valve by moving the room thermostat pointer above and below room temperature and observing that the main burn ers light on call for heat and go off when the pointer

is moved below the room temperature setting. All

Bryant automatic gas control valves have a delay when opening or closing.

Fan/Limit Control Operation

At the moment the thermostat calls for heat, the time

delay mechanism of the control is energized. If, due to pilot outage, the control bimetal element does not

sense a temperature change, the control will turn on the blower strictly by means of the time delay feature.

If for any reason the time delay is not energized as the thermostat calls for heat, the control bimetal element will bring on the blower when it senses a temperature rise of 50 degrees Fahrenheit (standard differential)

above the turn-off setting. During the blow-down period and after the thermostat is satisfied, the con trol will turn the blower off at the indicated setting sensed by the control bimetal element.

TABLE I—DIMENSIONS IN INCHES

MODEL & SIZE A

394D-000050

3940-024050

394D-000080

14-3/16 46-3/16

12 12

46-3/16 46-3/16 10-3/8 9-1/2 14-1/2 27-1/8

394D-024080 14-3/16 46-3/16

3940-036080 14-3/16 46-3/16 12-9/16 394D-000100 394D-036100 3940-048100 394D-000125 394D-036125 394D-048125 394D-060125 394D-000150 3940-048150

394D-060150 394B-060150 394D-060175 394B-060175 394B-060200

17-1/2 46-3/16 17-1/2

46-3/16 15-7/8 15 14-1/2 27-1/8 21 46-3/16 21 21

46-3/16

46-3/16 21 46-3/16 21

46-3/16 19-5/16 18-1/2 14-1/2 27-1/8

24-1/2 46-3/16 24-1/2 46-3/16 24-1/2 24-1/2 31-1/2 31-1/2

31-1/2

49 22-7/8 21 18 29-15/16 49 22-7/8 21 18 29-15/16 49 29-7/8 29 18 29-15/16 49 29-7/8 29 18 29-15/16 49 29-7/8 ' 29 18 29-15/16

D E F

10-3/8 9-1/2

14-1/2 27-1/8

12-9/16 11-11/16 14-1/2 12-9/16 11-11/16

11-11/16

15-7/8 15

19-5/16 18-1/2 19-5/16 19-5/16 19-5/16

18-1/2 14-1/2 27-1/8 18-1/2 14-1/2 27-1/8 18-1/2 14-1/2 27-1/8

14-1/2 27-1/8 14-1/2 27-1/8 14-1/2 27-1/8

14-1/2 27-1/8

27-1/8

22-7/8 21 14-1/2 27-1/8 22-7/8

21 14-1/2

27-1/8

32-9/16 32-9/16 32-9/16 32-9/16 32-9/16 32-9/16 5 32-9/16 32-9/16 32-9/16 5 32-9/16 32-9/16 5

32-9/16 5 32-9/16 32-9/16 35-3/8 6 35-3/8 6 35-3/8 35-3/8 7 35-3/8

TABLE II—RATINGS AND PERFORMANCE*

NATURAL and LP Temp

Rise

MODEL

394D-000050

3940-024050 394D-000080 394D-024080

3940-036080 394D-000100 394D-036100

Input Btuh

50,000

80,000

100,000

Output Btuh

40,000

64,000

80,000

Range

70-100 45-100 70-100 70-100 45-100 70-100 45-100

3940-048100 45-75

394D-000125 394D-036125 394D-048125

125,000 '

100,000 394D-060125 394D-000150 394D-048150 394D-060150

150,000

120,000 394B-060150 394D-060175 394B-060175

175,000

140,000 394B-060200 200,000 160,000

"The above ratings are certified for altitudes to 2000 ft. For elevations above 2000 ft. reduce ratings 4% for each 1000 ft. above sea

level.

70-100

70-100 45-100 45-75 70-100 45-100 45-75 45-100 45-100

45-100 70-100

Heating

Ext Static

Pressure

0.12

0.15

0.2

0.5

0.5 1634

Cooling

Ext Static

CFM

408

Pressure

—

482 0.5 654 — 772 0.5 772 818

—

965 0.5 1200 1157 1540 1020

—

1069 1206

0.5 1447 1225

— —

1454 1736

0.5 1447

1688 1688 2290

0.5

0.5 2460

A72591

Vent

Dia

4 4 4 4 4

5 5

CFM

—

780

—

790

1190

—

1210 1560 2000

1500

2080 2310 2010

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