Bryant 394 User Manual

394

Installation Instructions

GAS FIRED FORCED AIR FURNACE

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 Standard “Installation of Gas Appliances and Gas Piping,” ASA Z21.30.

Model 394 Gas Furnaces are shipped from the factory completely assembled and wired ready for indoor

upflow heating installation. They are manufactured with two types of blowers: belt and direct drive. The three smaller sizes (Series F), 50, 80, and 100, are direct drive only. All sizes incorporate a low-voltage terminal strip for convenience of field wiring.

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

Note: Do not use Cooling Relay Kit with 3/4-HP Blower Motor sex Drive Models.

CAUTION:

1. Counterflow furnace must be installed on an ap

proved non-combustible base.

2. Be sure temperature rise does not exceed that specified on the unit rating plate.

3. Be sure to check all controls for proper operation upon completion of installation.

I. CLEARANCE REQUIREMENTS

The upflow furnace is certified for use on combustible floors.

The furnace is certified by the American Gas Asso ciation, Inc., for installation in a closet or alcove provided the following clearances from combustible construction are maintained:

Sides

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

Back.............................................................0" (1")*

Top of Plenum

Vent Connector............................................6" (6")*

Front

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

*Figures shown in parentheses are approved clearances

when the furnace is installed as a counterflow furnace.

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

0" (1")*

3" (0")*

6" (6")*

Series F

Sizes 50 thru 220

bruant

Cancels ^39№31

II. CONTROLS

Bryant Automatic Gas Control Valve

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 of approximately

15 to 30 seconds.

Automatic Pilot

To check the pilot operation, follow the instructions below:

1. Set the room thermostat on call for heat. (There

is a delay before burners light.)

2. After the burners light, shut off the pilot gas valve.

3. After the pilot is out, the monometal element cools and returns to the open position. This breaks the circuit to the gas valve and the burners will extinguish.

Pilots with Thermocouple 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 diaphragm gas control valve is powered externally from the transformer, and operates independently of the inline shut-off valve. When there is a pilot flame, the current generated by the thermocouple 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

UPFLOW FURNACE

A.G.A. RATINGS BTU/HR

Modet

No.

50-394 50,000

80-394 80,000 100-394 100,000 125-394 1 37-394 165-394 165,000 132,000

190-394 190,000 152,000

220-394 220,000 176,000

Model No.

50-394 46 26 80-394

1 00-394 125-394 46 26 20'4 18% 137-394 46 1 65-394

190-394 51

220-394

1 nput

125,000 100,000 1 25,000 100,000

137,500 11 0,000 Not available

A В C

46 26 16 1/4

26 18'/4

28У4 283/4

51 283/4

16'/4

20'A

2 81/4

36У,

361/4

Natural Propane

Bonnet

Capacity Input

40,000 50,000 40,000 64,000 75,000 60,000 80,000

D E

14=/8 20 14%

165/g

18% 20 26% 34%

343/s

20 20

173/4 173/4 173/4

100,000

150,000

175,000

200,000

'/2

2/2

2% 2%

Bonnet

Capacity Natural

120,000

140,000

160,000

2V,

23/4

23/4 5" 14%

23/4 23/4 5 5 (2) 5" • 5 (2) 5"

*Both Sides

be generated by the thermocouple and the 100% inline shut-ofF valve will close. No gas can then flow to the pilot.

GAS CONNECTION

SIZES

'Л '/2

12/4

4" 12'/4

18%

5" 18%

25%

'/2 '/2

'/2 '/2 '/2 /2 '/2 'Л ’/2

'/2 '/2

80,000

H J К L M N P

33% 33%

Propane

'/2

22%

22% 22% 22%

22%

23% 23% 23% 2%

l'/2 l'/2 l'/2 l'/2 l'/2 23/8 23/8

Bottom

14 X 25 X 1 14 X 25 X 1 135

14 X 25 X 1

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

(2) 14 X 25 X 1 (2} 16 X 25 X 1

0) 16 X 25 X 1

(1) 20 X 25 X 1 (2) 16 X 25 X 1

(1) 16 X 25 X 1

(1) 20 X 25 X 1

12 23

1 2 23

1 4

1 8

1 8 23

23 23 23

Filter Sizes

Side Filter

Sizes

14 X 25 X 1 153

(2) 16 X 25 X 1

R s T

1 %

23 23

24 24 24

1 %

2% 8% 2%

2'/e

2 2

8У2

Approx.

Shipping

Weight

178 200 202 282

365

*333/8

*335/8

ЗУ2

*33%

ЗУ2

*333/8

3V2

4 30'3/4 4

30'3/i

D5 Natural

Should the pilot go out, no current will be generated by the thermocouple and the pilot-relay will close, shutting oiF 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 821/8.22 relay for fan control. (The 821 relay is used with the 643 gas valve on furnace sizes 50 through 165; the 822 relay is paired with the 641 valve on sizes 190 and 220.) 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 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.

39394D41

-RMiXAL 'R - 3^.

Ш 8?1. 622

^ T VE

DEL-iY

■ '!• PPI

Figure 1 - Control Box, Installed View

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