Bryant 378 User Manual

378

Installation Instructions

ALL WEATHER HEATING & COOL!!^iG

GENERAL

The Model 378 is approved by the American & Association for:

1. Use with natural, mixed, and propane gases.

2. Outdoor installation

a. On a roof

b. At ground level

3. Indoor installation (when equipped with Bryant draft hood assembly. Part No, 36154C8 and special front door in place of door furnished.)

a. Attic b. Basement, utility room, etc.

4. Use with 36W, 54W, 90W, and 108W water coils.

5. Use with 48R, 60R, 90R, and 120R direct expan sion coils.

Series B

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39378 D9 5/10/65

INSPECTION

Be sure available gas supply is the same as shown on American Gas Association rating plate.

Check electric supply - voltage, phase, and fre quency - to be sure that it is the same as required

on the rating plate. Check to be sure that adequate power is available to handle the increased electri cal load when the unit is used for cooling.

Installation of the all-weather heating and cooling unit consists of the following:

1. Locating the Unit

2. Gas Piping

3. Venting

4. Electric Connections

5. Start-up and Adjustment

6. Connection with Electric Air Conditioner (when

used)

7. Connection with Gas Air Conditioner (when used)

LOCATING THE UNIT

When installing in conjunction with a cooling sys tem refer to the applicable section of this instruc tion for additional information.

Before locating the unit, refer to local codes.

OUTDOOR INSTALLATION

Mounting

The unit design permits use of four corner posts, rails, or any other method of support sufficiently strong to accommodate the weight; however, consult

local codes - particularly for roof installation. Units must be level.

Clearances

1. Provide a minimum 1 inch clearance on bottom

for water drainage (rain, sleet, and snow).

378 ALL WEATHER INDOOR/OUTDOOR UNIT

48R-378 60R-378

Heating input Btuh 150-100,000 Bonnet capacity

Btuh 112-75,000

DX Coil rating Btuh 48,000

Water Coil rating

Btuh

— —

Air flow CFM 1600

External static

Blower motor

In. water 0.20 H.P. Volts Phase

150-100,000

112-75,000 112-75,000

60,000

2000

0.20 0.15

1/2 3/4

230 230

1 1 1 Cycle 60 FLA

4 Suction line In. o.d. 1-1/8 7/8 Liquid line Inlet water line Outlet water line NPT Condensate drain In. o.d. 7/8 Refrigerant R 500 Filters (disposable) In. Approx, shipping wt. Lbs.

In. o.d. NPT

1/2

3/8

- -

- 7/8

500

(2)25x20x1 (2)25x20x1

580

600

36W-378 54W-378

150-100,000

- -

36,000

1200 1800 3000 ' 4000

1/2

230

5 4

- - 1-1/8

1-1/4

JTTpri

7/8

- -

(2) 25x20x1

595 605 975 985

90R-378 120R-378 90W-378

150-100,000

300-200,000

112-75,000 225-150,000 225-150,000

54,000

0.20

90,000

—

0.25 0.30 0.25

110,000

■ — 90,000

3/4 1 Ir 1/2

230 230 230

1 1 1

5 7

1-3/8

1-1/4

1-1/4 ■■

7/8

5/8 5/8

—

7/8

22 500

(2) 25x20x1

(4) 25x20x1

(4)25x20x1 (4) 25x20x1

■ 300-200,000 225-150,000 225-150,000

: 3000

1 1- 1/2

: ; (230

60 60

9 7

- - - —

1-1/4

7/8

—

710

108W-378

300-200,000

108.000 3600

0.30

230

' -

1-1/4 1-1/4

7/8

(4)25x20x1

995

Outdoor Installation - Clearances (cont’d)

2. Provide adequate clearance for outlet and return duct connections.

3. Clearance from combustibles: From casing, all sides and top 6"

* From base ...............................

0”

When the furnace is installed in a building of un usually tight construction, air for combustion and ventilation should be obtained from outdoors or from spaces freely communicating with the outdoors. Two openings should be provided, each having a free area of one square inch for each 2000 Btu per hour one located above the draft diverter relief opening and the other near the floor.

*This permits use of combustible material as sup

port.

Caution: When using rails, etc. as support, do not

enclose unit so as to interfere with drainage.

4. Service clearance: Front - 24"

Side - Provide adequate side clearance for fil

ter removal. Clearance on left side for blower service; side clearance for coil service.

Provide adequate clearance when air conditioner is located adjacent to unit.

INDOOR INSTALLATION

Mounting

Unit may be set flush with floor or mounted on sup ports. There is no need to provide clearance under the base. Shim as required to make unit level.

Clearances

1. From combustible materials: a. 0 " clearance on bottom.

b. 6" clearance from casing surface; line con tact allowed.

c. 6" vent and draft hood.

2. Service access: Same as for outdoor installa tion.

COMBUSTION AND VENTILATION AIR

When the furnace is installed in a confined space, but in a building otherwise having adequate infiltra tion from the outside, air for combustion and venti lation may be taken from the building. Two openings should be provided, each having a free area of one square inch for each 1000 Btu per hour- one located above the draft diverter relief opening and the other near the floor.

For further information on this subject, refer to

ASA Z21.30-1959, or later editions of this standard,

“Installation of Gas Appliances and Gas Piping.”

GAS PIPING

The gas supply line should be a separate line direct from the meter to the furnace.

Check local utility for recommendations concerning

existing lines. Choose a supply pipe size large enough to keep the pressure loss as low as practi cal.

Never use pipe smaller than the gas connection to the furnace. Observe local codes for all gas pipe

installation.

The following are pertinent recommendations:

1. Avoid low spots in long runs of pipe, it is best to grade all pipe 1/4 inch in 15 feet to prevent traps. All horizontal runs should grade to risers. Risers should be used to connect to the furnace and to the meter.

2. Install a drip leg in the riser leading to the furnace. This drip leg will serve as a trap for dirt

and condensate.

The drip leg can be installed by connecting a tee to

the riser leading to the furnace so that the straightthrough section of the tee is vertical. Then, connect a capped nipple to the tee. The capped nipple should extend below the level of the gas controls a minimum of 6 inches.

3. A manual shut-off valve should be installed in the gas line within sight of and convenient to the furnace. This shut-off valve is furnished.

4. Support all piping with appropriate hangers, etc. Properly support gas piping at furnace to prevent damage to weather tight seal.

5. After all connections are made, check for leak age using soap and water solution, or in accordance

with local utility regulations. Never use a match or

other open flame.

- 3

EH 378

VENTING

INDOOR INSTALLATION

Consult local codes. Unless the local codes direct otherwise, the unit may be vented to a permanent chimney, or to a listed Type B or Type C gas vent.

The Model 378 furnace is approved for indoor instal lation only when used with draft hood, Bryant Part No. 36154C8.

To install indoor draft hood: a. Remove upper front access panel to gain en

trance to flue collector.

8. If more than oiie appliance is vented into the same chimney, the cross-sectional area of the chim ney must be as large as the largest flue pipe being connected, plus 50 per cent of the cross-sectional

areas of the additional flue pipes being connected.

9. If more than one appliance is manifolded into the same flue connecting pipe, the cross-sectional area

of this manifold pipe must be as large as the sum of

the cross-sectional areas of the pipes connecting

into it.

10. Flue pipe must be at least 6 inches from any

combustible materials.

b. Insert draft hood inside furnace casing collar and push it down over the flue collector collar to form snug connection.

c. Fasten draft hood to flue collector collar with sheet metal screws.

The following recommendations are made:

1. Select flue connection material that is satis factory for the installation and that meets the requirements of the local codes.

2. The flue connection pipe must be the same size as the outlet collar on the furnace. No reduction in this size is permissible in the pipe run.

3. Run pipe as directly as possible with a minimum number of turns.

4. Maintain a minimum of 1/4 inch per linear foot upward slope on all horizontal runs.

5. Rigidly support the flue pipe with hangers and

straps to insure that there will be no movement after installation.

6. Extend the flue connection pipe through the chimney wall, flush with the inner face of the chim ney liner. Never connect into a chimney serving an open fireplace unless the fireplace opening is sealed off.

Do not use dampers or other adjustable restrictions in flue.

Any part of the vent which is outdoors must be ade quately insulated to assure proper chimney action and prevent condensation.

OUTDOOR INSTALLATION

The Model 378 all-weather unit is shipped with out

door vent as standard equipment and must be instal led in accordance with the following instructions and without alterations.

Installing Outdoor Vent

1. Remove upper front access panel to gain en

trance to flue collector.

2. Insert cap and pipe assembly through furnace casing.

Important: Be sure the outer wall of the double

walled pipe extends over the furnace casing con

nector collar to assure weather tight connection and that the inner wall connects to the flue collector collar.

3. Fasten the flue pipe assembly to the flue col lector collar with sheet metal screws. Note: Addi tional venting is not required on outdoor units.

7. The chimney or gas vent should extend high enough above the roof or neighboring obstruction so that wind from any direction will not create a positive pressure in the vicinity of the outlet of the

chimney or gas vent. The installer is referred to Part V of American Standard “Installation of Gas Appliances and Gas Piping”, ASA Z21.30, 1959 for detailed information on chimney and gas vent use. In general, the chimney or gas vent should extend 3 feet higher than the point of emergence through the roof, and at least 2 feet higher than any object within a radius of 15 feet.

EH 378

ELECTRIC CONNECTIONS

1. All electrical connections are to be made in accordance with National Electrical Codes and

local codes governing such wiring. Field connections are to be made in accordance

with wiring label attached to unit. See Figures 1 and

2. Weather tight connections must be made at elec trical entrance to the unit on all outdoor installa tions.

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