Bryant 454 User Manual

Installation Instructions

454

SIZE 36

SERIES W

GAS-FIRED AIR CONDITIONER

Installation of the Model 454 Gas Air Con
ditioning unit consists of the following steps:

I. Locating and Mounting the Unit

II. Connecting Chilled Water Lines
III. Making Electrical Connections
IV . Making Gas Connections

V . Charging Systena with Water

VI. Checking the Unit Operation

VII. Adjusting Gas Input

VIII. Balancing the System

DC . Freezing Weather Protection

Each of the above steps is discussed in detail
in this instruction. Read the entire instruc -

tion before starting the installation.

Multiple Chillers and Cooling Coils

bri|ant

I

39454D1

4/25/69

■■1

When it is planned to connect two or more
chillers or coils, additional piping and
electrical information is required and should
be obtained from your Bryant Distributor.
When making multiple chiller installations, it
is recommended that only 454 chillers be
interconnected. The use of other model chil
lers with the 454 in a multiple system should

be avoided.

Operation at Atmospheric Pressure

The chilled water tank on this unit is vented

to the atmosphere; consequently, the chilled
water circuit operates at or near atmospheric
pressure.

Therefore, conventional piping practices for
a closed, pressurized system do not apply
for this unit.

NOTE: When the water chiller is piped to a
boiler as described below, the indoor coil
operates at or near atmospheric pressure

when used for cooling; it may be pressurized
when it is used with the boiler for heating.

Figure 1 - Model 454 Gas Air Conditioner

When this chiller is piped with a boiler to
form a combination heating and cooling sys ­tern, provisions must be made for a positive
shut-off between the chiller tank and the
boiler.

When the boiler is in operation, the chiller
tank must be by-passed. A sedime:
must be installed
when a common pipe (|oni
and boiler.

When the chiller is i:

of course, should be b;

DO HOT

LOCATING AND M

The unit is designed for outdoor installation.
It may be located at ground level or on a

roof. Consult local or other applicable codes
for information concerning proximity to
property lines, height above roof, obstruc
tions, etc.

36/454

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Mounting Base

Clearances

The unit is supported on 3 rails attached to

the bottom of the base. These rails extend

the full width of jiie unit as shown in the
dimensional drawing on page 2 .

The recommended types of mounting bases

for all installations are:

a . Precast concrete lintels .
Use three lintels run the depth of the unit;

one each under the right and left end and one
at the center of the unit.

b, Concrete blocks .
Use a block under each corner plus a block

under each of the two long sides midway be
tween the corner blocks . Arrange the blocks
so that the center rail as well as the front
and back rail is supported.

c . Concrete slab.
Minimum thickness 4 inches.

CAUTION: ALWAYS USE NON-COMBUSTIBLE

MATERIAL FOR THE BASE.

)

The condenser coil is located at the front of
the unit with the condenser air inlet through
the rear fan opening and the discharge
through the louvered front panel.

The minimum clearance between the back of
the unit and a wall is 15 inches. If the over
hang is less than 7 feet above the unit, the
unit must be mounted outside a plumb line

from the eaves of the overhang. The clear
ance on the right and left ends should be a

minimum of 2 feet to provide access for
servicing.

□

AVOID

OPEN

WINDOWS

SLEEPING

QUARTERS

LIVING
AREA

Figure 2 - Locating the Unit

I—I AVOID

u:

GARAGE

ELLS

□

GOOD

location:

AIR
FLOW

r

15

MINIMUM

I. CONNECTING CHILLED WATER LINES

Refer to the following information: 'Multiple Chillers and Cooling Coils", page 1; "Operation

at Atmospheric Pressure, " page 1; and "Cold Weather Protection, " page 8.

TABLE

Nominal
Pipe Size

Inches

Polyethylene Pipe

3/4

1

* Note: Values shown in the above table are for one direction only, and using Bryant water coils. Total length of pipe,

from chiller to coil and return, would be double the values shown. Values apply to single unit installations only.
All distances shown are calculated on the predication that only long elbows are used. Galvanized well head elbows
are used with the polyethylene pipe. When using plastic hose, avoid any sharp bends that would tend to restrict or
stop the flow of water.

Allowable Distance* between Coil Models 404, 405, 406, 407, 408 and Chiller

Size 36

65 ft

280 ft

Bryant Quick Connect

Plastic Hose

Size 36

45 ft

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Copper Pipe

Size 36 Size 36

Galvanized Pipe

67 ft

' 260 ft

87 ft

304 ft

36/454

Materials

1 . Chilled Water Piping

a. Use Bryant quick connect plastic hose.
b. Polyethylene pipe - satisfactory substi

tute; use medium density flexible pipe
whose wall thickness approximates
Schedule 40 pipe (Commercial Standard
CS 255-63). Pipe must be made from
virgin material. Do not use pipe manu

factured from re-claimed material.
c . Copper - satisfactory substitute .
d. Brass - satisfactory substitute.

2. Fittings
a. Galvanized - use when possible.

b. Brass - satisfactory substitute .

WATER FLOW RATE

AT VARIOUS EXTERNAL PRESSURES

Table II - Model 36-454

Water Flow Rate

GPM

2.0

3.0

'4.0

5.0

6.0 23.8

7.0

7.5

8.0

9.0

10.0 19.7

11.0 18.6

Pressure External to Unit

Ft Water Std RPM

25.9

25.5

25.0

24.5

23.0

22.5

22.0

21.0

Pipe Length and Diameter

Table I shows the maximum length of pipe of
different diameters that can be used between
the pump discharge and the coil inlet and still
maintain minimum allowable (design) water

flow rate.

1. Multiply table values by two to obtain the

total length of pipe from chiller to coU and

return.

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

3. Lengths shown in Table I are based on
using a total of eight well head fittings 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 size pipe.

4. For calculating chilled water pipe size for
coils not listed use friction loss method with
allowance for coil pressure loss. Refer to
coil instructions for pressure loss at design
water flow rate. Refer to Table II showing
available head with standard pump drive. For
additional pump head consult your Bryant
Distributor.

Insulation

1. Insulate both supply and return lines .

2. Material should be of good quality and be
covered with a good vapor barrier. Armaflex
or equivalent is recommended. Use 1/2-inch
wall thickness .(Plastic hose is pre-insulated.)

36/454

Height of Coil above Unit

For the Model 36-454 the maximum vertical
distance from chiller to top of coil is 21 feet.
For greater heights an adjustable water pump

pulley kit is available, Part No. 65070D01.

Water Coil Connections

1. If the cooling coil is used in connection
with a heating unit and the heating unit is not
approved for installation downstream from
the cooling coil, install the cooling coil in
parallel with or downstream from the heating
unit. This will avoid condensation in the heat
ing unit. If the coil and heating unit are in
stalled in parallel, the dampers or other
means used to control flow of air should be
adequate to prevent chilled air from entering

the heating unit; if manually operated, the

dampers shall be equipped with some means

to prevent operation of either unit uiiless the

dampers are in full heat or full cool position.

2. If the coil is located in a warm air stream,

do not connect polyethylene pipe directly to
the coil. Connect a minimum of 24 inches of
copper or galvanized pipe to both the coil in
let and outlet; then connect the polyethylene
pipe to these nipples . Note: not required when
using Bryant quick connect plastic hose.

3. On installations where the water in the
outside piping freezes and the coil is in a
heated air stream, precautions must be taken

to provide for water expansion. The connect
ing polyethylene pipe acts as an expansion
vessel if there is sufficient footage in the

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