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

I

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

A

51

•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

В

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%

1%

23%

1%

3

1%

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%

1%

(2) %

L M N P

23

12

1%

12 23

1%

14 23

1%

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} 1 6 X 25 X 1

(4) 16 X 25 X 1

1%
1%

1%
2% 8%
2%
2'%

R s

23%

2

1%

2 23%
2 23%

23%

2

4 30%
8% 4
8%

4

APPROX.
SHIPPING
WEIGHT

135
155
178
200
275

355

355
400

550
710

710

27%
27%
27%
27%

30%

30% .

t

393U

-2-

COUNTERFLOW

EZD

G

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

75

26 16V4

75

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"

G

22%

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

FURNACE

*

H

J К

2% 27%

1%

2% 27%

1%

2% 27%

l'/2

2%

1%

4

2Ув

GAS CONNECTION

1

NAT. MFD.

% 'A

Vi
'A

27%

'Л % 'A

30%

% %

SIZES

.'A 'A

'A 'A

Prop.

'A

%

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
20

173%

23%
23%

3

3
53/s b"
43%

2-5" 30%

43%

2-5" 30%

4" 27%
4" 27%

5"

27% 2%

5"

27% 23%
30% 4

2%
2%
2%

2%
4%
4%
4%

2%
23%

4

4

■ 3 -

GAS CONNECTION

SIZES

NAT. MFD. Prop.

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

% % %
3%
%

% 'A

%
3% •

'A
'A

3%

•%

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 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

02

— —

X

X

X X

X

X

Figure 2 — Thermocouple Pilot

02 & 05 Controls

-

-

nr

4

Figure 4 — Slotted Port Burner

393U

Figure 1 - D2 Controls

641 Valve - 732 Pilot

-4-

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.

- 5 -

393U