Bryant 394 Gas User Manual

Installation Ins!

GAS-FIRED FORCED AIR FURNACE

394

Series G

Size 50 thru 220

INTRODUCTION

Before installing the furnace, refer to Bryant Form

No. 39003D1 “Procedure for Gas Appliances” (packaged with the equipment) for information con cerning combustion, venting, 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 heat ing installation. They are manufactured with two types of blowers: belt and direct drive. The three smaller

sizes (Series G), 50, 80, and 100. are direct drive only. All sizes incorporate a low-voltage terminal strip for convenience of field wiring (except HL and HH Models).

The optional equipment available includes: Counter flow Box; Side and Rear Drop Ducts; Side Filter Racks; Cooling Coil Housing; Combustible Floor Base Packages, for Counterflow Applications; Cooling Relay Kit, for field conversion.

CAUTION:

1 ( iiimli-!iImv liii[M,.e mus' bv ui'Killvd kii .m :ip

proved non-combustible base.

2 liL siiic icmpci.iMtii. Use ll■>l■^ no! c\».cci{ ili.i spcs-ilhil on ihc mil! i.iimu pkiic

' lie suic to chci.l' all ci'iiiiols iiii piiipci opt-i.i'ioi

upon cvimplction of installalivm.

4. Duralast filler on 125 and 137 iipflow fu.maces mus

be used with a skle filter rack or rear drop duct.

Cancels 39394D66

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 burner,

check the proper operation of this valve by moving the room thermostat pointer above and below room temperature and observing that the main burners light on call for heat and go off when the pointer is moved below the room temperature setting. All Bryant auto matic gas control valves have a delay when opening or closing.

Automatic Pilot

To check the pilot operation, follow the instructions below:

Attach a low-voltage test light to electrical leads of gas valve. With thermostat set above room temperature, shut off gas supply to burners and pilot, with main manual shutoff valve. If test light goes out within 45 seconds, pilot is functioning properly. If light does not

go out within 60 seconds, replace pilot.

39394D73 3/30/72

I. CLEARANCE REQUIREMENTS

The upflow furnace design is certified for use on com bustible floors.

The Model 394 design is certified by the American Gas Association, Inc., for installation in a closet or alcove

provided the following clearances are maintained.

Sides............................................................0" (1")*

Back

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

Top of Plenum.............................................3" (0")*

Vent Connector

Front............................................................6" (6")*

* Figures shown in parentheses are approved clearances

when the furnace is installed as a counterflow furnace.

Bryant Automatic Gas Control Valve

Note: On units equipped with an A-643 Bryant auto matic gas control valve, there are three positions for

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

II. CONTROLS

0" (1")* 6" (6")*

Pilots with Thermocoupie Elements

The D2 100% shutoff propane and D5 100% shutoff natural gas controls have pilots equipped with thermo couple elements.

The pilot flame should surround the tip of the thermo couple. It should also extend downward to include

3/8 to 1/2 inch of the thermocouple tip. The flame must not come in contact with any other part of the thermocouple.

D2 Propane

The thermocouple transforms heat energy from the pilot flame into electrical energy. The current thus generated is sufficient to operate the 100% inline shut off valve. The Bryant automatic gas control valve is

powered externally from the transformer, and operates independently of the inline shut-off valve. When there

UPFLOW FURNACE

A70652

A.G.A. RATINGS BTU/HR

Natural Propane

Model

No.

50-394

80-394 100-394 125-394 137-394 165-394

190-394 190,000 152,000

220-394 220,000 176,000

Model No.

50-394 16-1/4

80-394 100-394 18-1/4 125-394 20-1/4 137-394 20-1/4 165-394 28-1/4 190-394

220-394 *Optional gas inlet right and left sides provided. T = 33-5/8 and S = 3-1/2 on 50 thru 137 sizes only.

Input

50,000 40,000 50,000 40,000

80,000 64,000 75,000 60,000 100,000 80,000 100,000 80,000 125,000 137,500 165,000

26 46 14-5/8

16-1/4

26 26 26 26 46

36-1/4 36-1/4

28-13/16 28-13/16 28-13/16

Bonnet

Capacity

100,000 125,000 100,000 110,000 132,000 150,000 120,000

C D E

46 14-5/8 46 16-5/8 19-3/4 46 18-5/8 19-3/4

51 51 51

Input

Not Available

175,000

200,000 160,000

19-3/41 ¡9-3/4

18-5/8 19-3/4

26-5/8

17-3/4 2-1/2 5 6" 25-1/4

34-5/8

17-3/4

34-5/8

17-3/4 2-1/2 5 (2) 5"

Bonnet

Capacity

140,000

F G

2-9/16

1/2

2-9/16

1/2

2-3/4 5"

1/2

2-3/4

1/2

2-3/4

1/2

2-1/2 5 (2) 5" 33-1/4

Gas Connection

Sizes

Natural Propane

1/2 1/2 1/2 1/2 1/2 1/2

1/2

12-1/4

12-1/4 14-1/4 18-1/4

5". 5" 18-1/4 22-5/8

33-1/4

BOTTOM OPTIONAL

RETURN SIDE FILTER RACK

OPENING EITHER SIDE

1/2 1/2 1/2 1/2 1/2

(2) 14 X 25 X 1 .

1/2

(1) 16 X 25 X 1 (1) 20 X 25 X 1

1/2

(1) 16 X 25 X 1

1/2

(1) 20 X 25 X 1

22-5/8 22-5/8 22-5/8 22-5/8 1-1/2

23-5/16 23-5/16 23-5/16

Bottom

Filter Sizes

14 X 25 X 1 14 X 25 X 1 16 X 25 X 1 20 X 25 X 1 20 X 25 X 1

1-1/2 1-1/2 1-1/2

1-1/2

2-5/8 23

2-5/8

Side Filter Sizes

14 X 25 X 1 14 X 25 X 1 16 X 25 X 1 20 X 25 X 1 20 X 25 X 1

(2) 16 X 25 X 1

N P R S*

1-1/4

12 12 14 18 18

23 23 23 23 23

24 2-1/8 24 24

2-1/8

1-1/4

2-1/8

1-1/4

2-1/8

1-1/4

2-1/8

1-1/4 2-1/8

8-5/8 2-1/8 8-5/8 2-1/8 8-5/8

A66384

Approx.

Shipping

Weight

135 153 178 200 202 282

365

2-7/8

25-7/16

2-7/8

25-7/16

2-7/8

25-7/16

2-7/8

25-7/16

2-7/8 25-7/16

30-5/8

4-1/16 4-1/16 30-5/8 4-1/16

30-5/8

is a pilot flame, the current generated by the thermo couple holds the 100% inline shut-off valve in the open position and the gas control valve controls the flow of gas. Should the pilot go out, no current will be generated by the thermocouple and the 100% inline shut-off valve will close. No gas can then flow to the pilot.

D5 Natural

Should the pilot go out, no current will be generated by the thermocouple and the pilot-relay will close, shutting off the gas to the pilot, and breaking the elec

trical circuit to the Bryant automatic gas control valve.

821/822 Adjustable Fan Control

The Model 394 Furnace incorporates the 821/822 relay for fan control. (The 821 relay is used with the

643 gas valve on furnace sizes 50 through 165 natural

gas; the 822 relay is used with the 641 valve on sizes

190 and 220 and all propane units.) The 821/822 has a field-adjustable differential. The “max. off” setting on the dial is for the longest “off” time and shortest

“on” time.

When facing the front of the furnace, the “off” cycle is lengthened by moving the adjustment lever to the

Figure 1 - Control Section (D5 pilot relay shown)

left. The “off’ cycle is shortened by moving the lever to the right. The adjustment of the “off’ cycle has the opposite effect on the “on” cycle; however, to a lesser degree.

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