Bryant 394 User Manual

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Page 1

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

Page 2

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

^ '»J

Page 3

BASEMENT FURNACE

A.G.A. Ratings BTU/HR

Model

No.

Input

50-394

80-394 100-394 100,000 80,000 125-394 125,000 100,000 137-394 165-394 190-394

220-394

50,000 80,000

137,500 n 0,000 165,000 190,000

220,000

Natural Propane

Bonnet

Capacity

40,000 64,000

132,000 150,000

152,000

176,000

Bonnet

Input

50,000

75,000 100,000 125,000

175,000 140,000 200,000 160,000

Capacity

40,000 46 60,000

80,000

100,000

Not available 46

120,000

A В

40'Л

46 40 Уг

40’Л 2054 13Н

43 54

4314 36'А

43 54

D Е

иУв

1654

1б'Л иУв

18Й

20Й

2 8'/4 26Уа 17% 4'Л

3654

1 бУа

1 ^Уа

34Уа 17% 4'Л

34Уа

17%

F G Н

2'Л 2%

2'Л

2Уг

2'Л

4'Л 5 5 2-5"

4'Л

2-5"

J к

533Уа

|ЗЗУа

533Уа

t33ya

Ь"

ЗО'Уа 4 ЗО'Уа

30'5/й

Gas Connection

З'Л 54

з'Л

З'Л З'Л

4 4

Sizes

Nat.

54 Уа

'Л

54 Уа Уа Уа

Уа Уа

Уа

Уа Уа

Filters

Prop.

Уа

14 X 25 X 1 166

1 4 X 25 X 1

1 6 X 25 X 1

20 X 25 X 1 238

20 X 25 X 1

Two 1 6 X 25 X 1

Two 1 6 X 25 X 1 428

Ratings are certified for altitudes to 2,000 feet for all gases. Ratings for altitudes over 2,000 feet are 4% less for each 1,000 feet above sea level. Return air compartment shipped separately, knocked down.

tBoth Sides.

COUNTERFLOW

18% 100 SIZE

16% . 50 & 80 SIZE

FURNACE

Approx.

Shipping

Weight

(Lb.)

192

213

240

343

428

It OUTLET

A.G.A. RATINGS BTU/HR

Model

No.

50-394 50,000 80-394

100-394 100,000

125-394 125,000 137-394 137,500 165-394 165,000 190-394 190,000 220-394 220,000

Input

80,000

Capacity

Natural Pro pane

Bonnet

100,000

1 10,000

132,000 152,000

176,000 200,000 1 60,000 80 28% 36% 34%

Input

50,000

40,000

75,000

64,000

100,000 80,000 75 26

80,000

125,000

150,000

175,000

Bonnet

Capacity

40,000 60,000

1 00,000

Not available 75 26 20% 18%

1 20,000 1 40,000 80

В C 0 E

75 26 75 26

75 26

80 28%

28% 36% 34%

*Add 114” when installed with base on combustible floor. tBoth Sides.

**See above “CS” Drawing for Dimensions (50-80-100 Sizes Only).

TYP'E "C" dimensions

16Й 14%

14%

16(4 18У4 16%

18%

20(4

26%

F G H J К

4" 12% 22%

2% 2% 2% 2% 2% 4'/a

5 (2) 5" 33%

12%

14%

5" S" 18% 22%

18%

25%

33% 23%

(2) 5”

22% 22%

22% 23%

23%

I'/a 1Уа I'/a I'/a I'/a

1Уа 1Уа 1Уа

t33ya

ЗУа

t33ya

ЗУа

ТЗЗУа

ЗУа

t33ys

ЗУа

|ЗЗУа

ЗУа

4 301 У. 4 ЗО'У. 4

ЗО'Уа

* L

TLET I

GAS CON.

SIZES

Nat. Prop.

Уа Уа Уа Уа Уа Уа Уа Уа Уа Уа Уа Уа Уа Уа Уа

Filters

16x20x1

Уа

16 X 20 X 1 Two 1 0 X 20 X 1 210 Two 1 4 X 20 X 1 Two 1 4 X 20 X 1 Two 1 6 X 20 X 1 Two 20 X 20 X 1

Two 20 X 20 X 1

Approx.

Shipping

Weight

(Lb.)

166

185

235 237 325 405 405

39394D41

Page 4

TO HEATINQ AND

I COOLING CONNECTIONS

VOF THERMOSTAT ( P/N 34427D030

34427D03Ì

TO CONDENSER CONTACTOR COIL CONNECTIONS

TO HEATINS AND

COOLING CONNECTIONS ^OF THERMOSTAT ' P/N 34427D030

a 344270031

-, ' TO CONDENSER

- I LOW VOLTAGE

■ " ' —ALEAD OR

NOTE^

WIRE WITH* IN FIGURE 2 IS REMOVED AND DISCARDED WHEN CONDENSER HAS TRANSFORMER.

^ J TERMINAL STRIP

Figure 2 - Control Box, Cover Removed, No Internal Wiring Changes

Low-Voltage Wiring

Field low-voltage connections are made at the low-

voltage terminal strip. See Figure 6 for heating only.

For Model 394 Furnaces used in conjunction with electric or gas air conditioning units that do not have an integral transformer, see Figure 2. If the 394 Fur nace is used in conjunction with an electric or gas air conditioning unit having an integral transformer, see Figure 3.

Figure 3 shows a field-installed wire running from

one side of the air conditioning transformer, through the hole marked “F” in the terminal strip to the blower relay in the control box for the Model 394 Furnace. The wire marked * in Figure 2 is removed from the control box and discarded.

Limit Control

This control shuts off the gas and energizes the blower motor if the furnace becomes overheated.

The recommended method of checking the limit control is to gradually block oif the return air after the furnace has been operating for a period of at least five minutes. As soon as the limit has proven safe, the return air opening would be unblocked to permit normal air circulation. By using this method to check the limit control, it can be established that the limit is function ing properly and will “fail-safe” if there is a motor failure.

Figure 3 - Control Box, Cover Removed, Showing Internal Wiring Changes

Thermostat Location

The room thermostat should be located where it will be in the natural circulating path of room air. Avoid locations where the thermostat would be exposed to cold air infiltration, drafts from windows, doors, or other openings leading to the outside, or exposure to air currents from warm or cold air registers; or to ex posure where the natural circulation of the air is cut off—such as behind doors, above or below mantels, shelves, etc.

The thermostat should not be exposed to heat from nearby radiators, fireplaces, radios, televisions, lamps, or rays from the sun. Nor should the thermostat be mounted on a wall containing pipes or warm air ducts,

or a flue or vent which could affect its operation and prevent it from properly controlling the room tempera ture. Any hole in the plaster or panel through which the wires pass from the thermostat should be adequately sealed with suitable material to prevent drafts from affecting the thermostat.

The heat anticipator on the thermostat should be set at 0.8 amps.

III. ELECTRICAL CONNECTIONS

Line-Voltage Wiring

All electrical connections are to be made in accordance

with the local electrical codes. A permanent, live, separately fused electric power supply, complete with manual switch, should be provided for the furnace. Field wiring connections should be made in accordance with the internal wiring as shown in Figure 6; select the appropriate combination of diagrams to match the equipment being used.

>41 39394D41

Page 5

Adjustment of Blower Speed

Four-Speed Direct Drive

To change motor speed taps, remove the motor tap lead (see Figure 1) and relocate it on the desired ter minal on the plug-in terminal block/speed selector located on the dividing panel. See Table I.

Belt Drive The blower speed may be changed by opening or clos

ing the motor pulley. When adjusting blpwer speed,

be certain that both pulleys are adjusted the same

number of turns.

CAUTION: When adjusting the blower speed, make certain that the temperature rise across the heat ex changer does not exceed that specified on the rating plate.

TABLE 1 - Factory Setting Blower Motor Chart

Drive Type

Unit Size

80 100 2 125

137 165 190 220

Red

3 1 2 1

Blue

to*

sM SE

Red

Blue

4 3 1

Red

BluetoRedtoRed

4 1 4 1 4 1 3 1 1 2 1 2 1

1 1

1 1 1

sex

Red

1 1 1 1 1 1

*Use when relay kit is field installed.

IV. CARE AND MAINTENANCE

Cleaning

The heat exchanger should be examined periodically

to see if there has been an accumulation of rust, soot,

etc. Clean as follows:

1. Disconnect pilot tubing at tube union.

2. Disconnect electrical lead from pilot. (In case of 100% shut-off controls, disconnect pilot thermocouple

lead from pilot relay or inline shut-off valve.)

3. Remove front plate from draft diverter (4 sheet-

metal screws).

4. Remove burners and pilot as follows: a. Remove Tinnerman clamp from burner-holding

stud.

b. Slide burner off orifice and remove under

manifold.

c. Pilot is attached to one burner and is removed

with that burner. It is not necessary to detach pilot before removing burner.

5. Remove metal angle strip holding flue baffles in place. See Figure 4.

6. Remove flue baffles. See Figure 5.

7. Use flexible-handled steel cleaning brush to loosen scale and soot. Remove scrapings from bottom of combustion chamber. combustion chamber.

8. Reassemble furnace by reversing above procedure.

NOTE: There is a slot in the back of the heat ex changer for the back tip of the burner to fit into. When properly placed, the burner will fit into this slot and will be level.

Color Code for Speed Taps

Common (white) Hi Speed (black)

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

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

#C Tap

#1 Tap

Med Speed (blue).........................................................#2 Tap

Med-To Speed (yellow) Lo Speed (red)

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

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

#3 Tap #4 Tap

Care of Blowers

All motors on the belt drive blowers are provided with oil cups and should be oiled at least twice a year with a nondetergent SAE 30 oil.

Figure 4-Flue-Baffle Retainer Strip

Figure 5-Removing Baffles

39394D41

Page 6

Belt Tension

Adjust tension on a V-belt so that the belt deflects approximately 3/4 to 1 inch when the pressure from one finger is applied midway between the blower and motor pulleys. Adjust the tension by turning the motor adjusting screw.

LINE VOLTAGE GRCUIT

BLK.

120V / , .

, - DIRECT DWVECsO

/NO CAPACITOR used')

VON DIRECT DRIVE/

BLK.

4 SPEED ^ ^

REB

FAV4

CONTROL

i a 141

WHITE Y ®

StE CHAHT^ t

LOW VOLTAGE CIRCUIT

BKOWN

UPPER UM\T /0\

COUMTERPUOWViJ/

PW-OT

safeW

SWITCH

Í (bMIT

OVl

prop)

BLK

^ % H.R,(SCX), DRIVE FURVIACE

15 F^CTORY WIRED FOR 230V.

POWER. IF ONLY 120V, POWER IS AVAILABLE, RED WHITE

WIRES MUST BE REVERSED AT THE TRANSFORMER. SEE \W1R\NG LABEL ON DUAL.

CIRCUIT MOD\F\E¿ BY COOÜ>A RELA^V (S.P.O.X) STAV4DAR0 ON SMASE \t\.D''INSrT^ULBD ON SL DRIVE..

______________

VOLTAGE MOTOR FOR

IZOV. CONNE.CT\OV4.

©in i V i

writeY

BLK.

CIRCUIT MODIFIED BY COOLING

RELAY <;s.P,D.T.)'TlELO” INSTALLED ON

SB.se 4 VeH.P. sex DRIVES

whiteY 51

230V.+

10 ^

FAN

eONTROl

SEE CHART

(RED)

BELT DWVE

ILL SB, SO ^

SOX lfeH.P.

_________________

li sIvJl 4Í

S.P.S.T, \

CDOLiwa X

RELAY WHITES

J ■'field n

7 INSTALLED

BELT DRIVE

; sex ONLY

(V4H,P.)

RED

FACTORY SETTING CHART

UNIT

size:

.50

lOO

I25

I37

1G5

\90

220 \

VALVE

FAN CONTROL

RED

—

2 I 3

— ■

—

BLUE

Filters

Some units are equipped with a permanent fiber filter (recognizable by its distinct green color). To clean this filter, run water through the fibers from the entering air side. Do not spray this filter with water-soluble oil.

THERMOSTAT COtmECTlONS

-HEATING ONLY-

(necD WRms is iwtcwa k wanco uwa)

SLUE

T) WRITE

BLK.

GREEN

WREN USED

7*W

DIRECT DRIVE TYPES

SLjSMB SE

BELT DRIVE TYPES

SB, SC $ sex

THERMOSTAT BN 34427035 (noTERMINAL code), also MODELS

883-P/N 344270030 OR 884-

P/N 34427D03I THERMOSTAT 4 SUB BASE.

note; remove inter

nal JUMPER BETWEEN

"I W 4 J TERM\NALS.

----------------

MAIN

LIMIT

COOLIN« RELAY

4 G X

DRIVE

REDTOBLUETOREDTOSUiE

TO* —

—

— —

—

— — —

—

*USE WHEN FACTORY REUCY KIT IS “FIELD" INSTALLED.

Y ^

F n TYPE SL,SM4SE

P/N 34427D33 THERMOSTAT

4 SUB-BASE OR THERMOSTAT

MODEL SaS P/n 3442.7MS WITH SUB

BASE P/N3442703i.

4 3

— —

DIRECT DRIVS^

BELT DRIVE TYPE SB, SC 4 sex

ON-OFF FAN, MODEL S85

SB RED

(

I \

—

sex

I I \

\ \

I —

RED

REO

— — —

\ \

39394D41

Figure 6 - Internal Wiring

Bryant 394 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

I. CLEARANCE REQUIREMENTS

Series F

Sizes 50 thru 220

II. CONTROLS

Automatic Pilot

D5 Natural

821/822 Adjustable Fan Control

COUNTERFLOW

FURNACE

Low-Voltage Wiring

Limit Control

Thermostat Location

III. ELECTRICAL CONNECTIONS

Adjustment of Blower Speed

IV. CARE AND MAINTENANCE

Cleaning

Color Code for Speed Taps

Care of Blowers

Figure 4-Flue-Baffle Retainer Strip