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
I
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
B
C
38 59
D
E
9-1/16 23-9/64
11-1/16 28-3/4
F
G
26-1/8 17-5/16
32-7/16
22
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
22
HP
AWG
1/3
14 *
54-451
22
1/2
12 *
717 717
Lb
18
750
- 2
31
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
C
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