Bryant 451A User Manual

nstallation Instructions

451

SERIES A

■

GAS-FIRED AIR CONDITIONER

Installation of the Model 451 Gas Air Conditioning

Absorption unit consists of the following steps:

I. Locate and mount absorption unit.

II. Connect chilled water lines. III. Electrical connections. IV. Gas connections.

V. Charge system with water. VI. Check-out and Operation.

VII. Adjust gas input.

VIII. Balance system.

IX. Purge Non-Condensibles.

Each of the above steps is discussed in detail in this irtstructiofl. Read entire instruction before starting installation.

Position unit and remove wooden shipping crate base as shown in Figure 1.

1. Saw wood stringers as shown.

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39451D1

2. Remove unit access panels and remove 3 shiping bolts from crate base.

3. Tilt one end of unit and remove half-section of crate base; then reiiiove remaining section while tilting the other end.

I. LOCATE AND MOUNT ABSORPTION UNIT

The absorption unit may be located at ground lével or on the roof. Consult local codes for information concerning proximity to property lines, height above roof, obstructions, etc.

A. MOUNTING BASE

1. Use non-combustible materials.

2. Base should be large enough that unit will not

overhang.

3. A poured concrete slab, minimum 4" thick, is recommended for ground installation.

4. On roof installations leave süfficieíit clearance between unit base and roof top for proper air circu-

, lation.

5. A unit supported on concrete blocks will require a block at each corner plus a fifth block under the front, midway betweèn the front corner blocks.

B. CLEARANCES

See Figures 2 and 3 for typical locations.

1. Absorption unit should have a minimum clear ance of 2 feet on all sides from any adjacent ob struction.

2. Avoid locating the unit where hot condenser discharge air can impinge on nearby obstructions and mix with the inlet air supply. The condenser air discharges upward at a small angle toward the front of the unit. With the condenser facing the wall the unit can be located at, or outside of the plumb line from any over-hang.

EH 451

Cancels: New

Effective 2/1/64,

Model A 36-451

46 31 52

54-451 55

38 59

9-1/16 23-9/64

11-1/16 28-3/4

G 26-1/8 17-5/16 32-7/16

H 3-7/64 3-39/64

Cooling Capacity Heat Input Condenser Air Delivery Water Flow (Min. Required)

Max. Frictional Loss Handled

by Chiller Pump

Max., Elevation of Coil

above Chiller Ft

Pump and Fan Drive

115V, 60 Cy., 1 Phase Minimum Wire Size * Refrigerant Type Refrigerant Amount Approximate Shipping Wt. Lb

EH 451

36-451

Btuh

Btuh Cfm Gpm

Ft Head 23 20

35,000 53,000

110,000 165,000

4,500 6,700

7.5 11

HP AWG

1/3

14 *

54-451

1/2

12 *

717 717

750

- 2

1,125

^Satisfactory where distance, measured along

wire path, between unit and connection into main panel does not exceed 100 ft. Where distances are longer, wire sizes should be increased accordingly.

TABLE

Nominal

Pipe Size

Inches

3/4 1 1-1/4

* Note: Values shown in above table are for one direction only. The total length of pipe from chiller to coil

and return would be double the above table values. The above table applies to single unit installations only.

Figure 1

Polyethy ene Pipe Copper Pipe

Size 36

40' 150' 530'

Size 54

—

45' 140' 40'

145'

Allowable Distance* between Coil and Chiller

Size 36

35'

Size 54

—

360' 100'

SLEEPING

□

AVOID

OPEN

WINDOWS

QUARTERS

LIVING

AREA

Galvanized Pipe

Size 36

25' 90'

370'

AVOID

'ells"

□

GARAGE

Size 54

—

30 '

90'

□

GOOD

LOCATION

II. CONNECT CHILLED WATER LINES

A. MATERIALS

Refer to section on “Cold Weather Protection” at the end of this instruction.

1. Piping

Figure 3

b. Copper - satisfactory substitute.

c. Galvanized - satisfactory substitute.

2. Fittings

a. Nylon - use when possible. b. Brass - satisfactory substitute.

c. Galvanized - satisfactory substitute.

B. PIPE LENGTH AND DIAMETER

Table I shows maximum length of pipe of different diameters that can be used between the pump dis

charge and the coil inlet and still maintain mini

mum allowable (design) water flow rate.

1. Multiply table values by two to obtain the total

length of pipe from chiller to coil ond return.

2. Length is measured along the pipe path and therefore includes vertical distance between the water coil and the chiller.

a. Polyethylene Plastic Pipe - use medium density flexible pipe whose wall thickness approximates Schedule 40 pipe (Commercial Standard CS 197-60). Pipe must be virgin plastic. Do not use pipe manu factured from re-claimed plastic.

- 3 -

3. Lengths shown in Table I are based on using a total of eight elbows in the entire water line (chiller to coil and return). Lengths are predicated on the use of a Bryant matching water coil. For greater distances use larger pipe or add a pump.

EH 451

CLARIFICATION

On page 4 of this Instruction under Section III Electric Connections, item 3 should read;

3. Provide a fused disconnect switch within sight of and not more than 50 feet from the absorption unit.

FIL

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