Bryant 393U User Manual

393U

Installation Instructions

GAS FIRED FORCED AIR FURi^ACE

The Bryant Model 393 forced air, gas-fired furnace may be installed as an

1.2.Upflow Furnace Counter-Flow Furnace

(except sizes 175 and 200)

Basement Furnace

This instruction contains complete procedures for

installing the unit as an Upflow Furnace.

When the furnace is used as a counter-flow, a counter-flow box and instructions are provided. When it is used as a basement model, a drop duct

and instructions are provided. The Series C and D

Counter-Flow Boxes are interchangeable.

/1 \ fr

"iKJ V fl

Series D

39393D2

Rev. 3/17/65

Before beginning installation, read these instruc tions carefully.

When making a Counter-Flow or Basement installa tion, also read the separate instructions furnished with the additional equipment required.

install the furnace in accordance with the require ments of the local utility or authority having juris diction.

The installer is referred to the American Standard “Installation of Gas Appliances and Gas Piping,” ASA Z21.30-1964, as a sound and practical guide to be followed when making the installation.

INSPECTION

Check the power supply available to be sure it

agrees with the information on the wiring diagram and the blower motor in the furnace.

Check the gas specification on the A.G.A. rating plate to be sure that the type of gas for which the unit is equipped is the same as the gas supply available.

Model 393 Furnace

FILTERS

When the furnace air distribution system is used for cooling, it is recommended in certain instances that the throw-away filters be discarded and the perma nent type, multi-velocity filters be substituted. The following table gives the air flows above which these high velocity filters should be used.

Size

80 100 1000 125

150 175 200

Air Flow - cfm

800

1240 1490 1800 1800

Leave these instructions on or near the furnace. Permanent filters are not required on Size 50.

UPFLOW

FURNACE

Model No.

50-393 46 26 16% 14% 20

80-393 46 100-393 46 26 18% 165% 20 125-393 46 150-393 175-393 51

200-393 250-393 300-393 350-393 400-393

•28%

■ 51 28%

MODEL

NO.

50-393 50,000

*80-393 ! 100-393 100,000 125-393 150-393 150,000

175-393 175,000 140,000

200-393 200,000 160,000 250-393 250,000

300-393 350-393

400-393

The 250, 300, 350 & 400 sizes are multiples of the 1 25, 1 50,

*For LP Gas, ModeJ Designation 80-V-393, A.G.A. Input 75,000,

283% 36%

Sizes 250 thru. 400 are multiples of sizes 125, 150, 175 and 200 respectively. Refer to the dimensions of smaller sizes to obtain overall’ dimensions for the

larger sizes. Provide clearance dimension between units for gas service and casing expansion. Refer to installation instructions for clearance.

C D E F G H

26 16%

26 20%

INPUT

*80,000

125,000

300,000 240,000 350,000 280,000

400,000 320,000

145% 20

185% 20

265%

28%

345% 345% 173%

36%

A.G.A. RATINGS BTU/HR GAS CONNECTION

23%

3 5" 18%

BONNET

40,000 64,000

80,000 100,000 120,000

200,000

53%

2'%

43% (2)5" 33%

2'%

43% (2)5" 33%

21%

1% 1% 1/2

'% '% % % %

% % %

(2) 1%

(2) % (2) 5% (21 % (2) % (2) %

(2) %

175 & 200 respectively.

Bonnet Capacity 60,000.

173% 173%

CAPACITY NAT.

J К

4" 12% 22% 4" 12% 5"

6" 25%

SIZES

MFD. Prop.

. '/2

’% '% % 1/2

% %

(2) % (2) 1/2

(2) % (2) %

22%

14% 22%

22%

23%

23% 25% 23% 25%

(2) %

L M N P

12 23

14 23

18 23

11%

25%

23 23 23

BOTTOM FILTER

SIZES

14 X 25 X 1 14 X 25 X 1 16 X 25 X 1 1 6 X 25 X 1 20 X 25 X 1

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

(1} 16 X 25 X 1

(1) 20 X 25 X 1

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

(2) 20 X 25 X 1 (4) 14 X 25 X 1

(2} 16 X 25 X 1

.(2) 20 X 25 X 1

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

24 24 24

SIDE FILTER

SIZES

14 X 25 X 1 14 X 25 X 1

20 X 25 X 1

(2) 16 X 25 X 1

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

[4} 1 6 X 25 X 1

(4) 16 X 25 X 1

1% 1%

1% 2% 8% 2% 2'%

R s

23%

2 23% 2 23%

23%

4 30% 8% 4 8%

APPROX. SHIPPING WEIGHT

135 155 178 200 275

355

355 400

550 710

710

27% 27% 27% 27%

30%

30% .

393U

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COUNTERFLOW

EZD

AIR OUTLET

A.G.A. RATINGS

MODEL

NO.

50-393, ^0,000

**80-393

100-393 125-393 1 25,000 1 00,000 75 150-393 150,000 120,000 80

* Add 1 when installed with base on combustible fioor.

** For LP Gas, Model Designation 80-V-393, A.G.A. Input 75,000, Bonnet Capacity 60,000.

BTU/HR

BONNET

CAPACITY

INPUT

80,000 64,000

100,000

40,000

80,000 75

* A В C D E F

26 16V4

26 26 26 20Й 18% 3 5" 283Л

143^

16'Л 14?4

16%

1814

28 26%

2% 2% 3 5"

5Ув 6" 25% 23%

4" 4"

22%

12% 12% 22% 14% 22% 18% 22%

FURNACE

J К

2% 27%

l'/2

2Ув

GAS CONNECTION

NAT. MFD.

% 'A

Vi 'A

27%

'Л % 'A

30%

% %

SIZES

.'A 'A

'A 'A

Prop.

FILTERS

16 X 20 X 1

16 X 20 X 1 Two 10 X 20 X 1 Two 14 X 20 X 1 Two 16 X 20 X 1

APPROX. SHIPPING

WEIGHT

(LB.)

166 185 210 235 325

BASEMENT

FURNACE

RATINGS

A.G.A.

ВТ

INPUT

200,000 250,000

400,000

U/HR

BONNET

CAPACITY

64,000

80,000 46 100,000 46 120,000 140,000 160,000 200,000 240,000 280,000

320.000

MODEL

NO.

50-393 50,000 40,000 *80-393 80,000 100-393 1 00,000 125-393 1 25,000

150-393 150,000 175-393 175,000 200-393 250-393 300-393 300,000 350-393 350,000 400-393

Ratings ore approved for altitudes to less for each 1,000 feet above sea

* For LP Gas, Model Designation 80-V-

A В c D

46 40% 16%

.46

40% 16% 40%

40% 20% 51 43% 28% 26% 17% 51 43% 36% 34% 17%

43% 36% 34%

51.

Sizes 250 through 400 are multiples of sizes 125, 150, 1.75, and 200 respectively. Refer to the dimensions of the smaller sizes to obtain overall dimensions for the larger sizes. Provide clearance dimensions between units for gas service and casing expansion. Refer to tnstallation instructions for minimum clearances.

2,000 feet for all gases. Ratings for altitudes over 2,000 feet are 4%

level. Return air compartment shipped separately, knocked down.

393, A.G.A. Input 75,000 Bonnet Capacity 60,000.

14% 14У, 20

18% 16У,

18Уа

E F G H J К

20 20

173%

23% 23%

3 53/s b" 43%

2-5" 30%

43%

2-5" 30%

4" 27% 4" 27%

27% 2%

27% 23% 30% 4

2% 2% 2%

2% 4% 4% 4%

2% 23%

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GAS CONNECTION

SIZES

NAT. MFD. Prop.

'A 'A 'A 'A 'A 'A 'A 'A

% % % 3% %

% 'A

% 3% •

'A 'A

•%

FILTERS

14 X 25 X 1 166 14 X 25 X 1 16 X 25 X 1 213

20 X 25 X 1 Two 1 6 X 25 X 1 Two 1 6 X 25 X 1 Two 1 6 X 25 X 1

APPROX.

SHIPPING

WEIGHT

(LB.)

192

238 343 428 428

393U

GAS

CONTROL

OPTIONS

Gas and Control Type

Components

City Gas

04 05

Bryant Automatic Pilot Bryant Gas Control Valve

Gas Pressure Regulator *

Transformer

Pilot Gas Filter **

X X X

X X

100% Shut Off

T. C. Pilot

Pilot Relay

Inline 100% Shut Off Valve

- X -

- -

* On the sizes 50, 80, 100 & 125 for natural gas only,

the regulator is part of a combination regulator, main gas shut-off and pilot shut-off.

** Mfd. gas only.

LP Gas

— —

X X

Figure 2 — Thermocouple Pilot

02 & 05 Controls

Figure 4 — Slotted Port Burner

393U

Figure 1 - D2 Controls

641 Valve - 732 Pilot

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LOCATING THE UNIT

1. This gas furnace is approved for use on combus tible floors except when installed as a counter-flow furnace. When installed as a counter-flow furnace on a combustible floor it must be installed on an approved base.

2. The furnace is A.G.A. approved for the following clearances from combustible construction in a clos

et or alcove installation.

Sides

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

0" (!")*

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

t Top of plenum. . . 3" (0")*

Vent connector . . 6" (6")* Front

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

6" (6")*

* Figures shown in parentheses are approved clear ances when the furnace is installed as a counter flow furnace.

t Refer to ASA Z21.30-1954 for clearances in open

area installations.

This gas furnace is not approved for use with air conditioning units mounted upstream from the fur nace heat exchanger. The cooling coil should either be downstream of the furnace heat exchanger or the

flow of cooling air should be by-passed around the

heat exchanger. If this parallel arrangement is used,

the dampers or other means used to control the flow of air must be adequate to prevent chilled air from

entering the furnace. If these dampers are manually

operated, they must be equipped with means to pre

vent operation of either unit unless the damper is

in the full heat or full cool position.

8. In general, when the furnace is installed in a large open space, there will be enough air for com bustion and ventilation. However, when the unit is installed in buildings of unusually air-tight con struction, or when the furnace is located in very restricted spaces such as closets or utility rooms, special provisions must be made for combustion,

ventilating, and draft hood dilution air.

3. Locate the furnace as close to the chimney as possible. The furnace should also be located as centrally as possible to the distribution system.

4. Provide ample space for servicing and cleaning. Consult your local approval agency for any special

clearance requirements.

5. The furnace should be level. Use shims as required, if the floor or foundation is not completely

level.

6. Advise owner to leave all air passageways to the furnace free of obstruction in order that there will be no interference with combustion and venti

lating air.

7. The furnace is designed for use with summer air conditioning. Therefore consideration should be

given to leaving ample space for a later installation of air conditioning equipment, if the air conditioning equipment is not being installed as part of the orig

inal furnace installation. Bryant manufactures a coil box for upflow furnaces.

If air conditioning will be added at a later date, the coil box, if installed on the original installation,

will save time and money later. A coil box is not

needed for counter-flow furnaces.

When the unit is installed in a confined space, pro vide the confined space with two permanent open ings, one near the top of the enclosure and one near the bottom. These openings must freely communicate with interior areas that have adequate infiltration air from the outside. Each opening must have a free area of not less than one square inch for each 1000 Btu/hr of rated input of oil appliances located within the enclosure.

If it is not practicable to connect the two openings to interior space, or if the interior space has in sufficient infiltration air, then it is necessary to connect the openings to the outside. If air openings are directly to outdoors, the minimum free area should be one square inch per 3000 Btu/hr of input rating or in accordance with Z21.30-1964 or latest edition, “American Standards for Installation of Gas Appliances and Gas Piping.”

It is strongly recommended that the installer consult the “American Standards Installation of Gas Ap pliances and Gas Piping,” ASA Z21.30-1964.

9. In restricted spaces it is very important that the return air ducts be sealed firmly into the furnace so that the return air will be kept separate from the combustion and ventilating air.

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393U

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