Bryant D 453 User Manual

Installation Instructions

453

Size 48

Series D

GAS-FIRED AIR CONDITIONER

Important - Read Before Installing

1. Check all local or other applicable codes for informa
tion concerning proximity to property lines, height
above roof, obstructions, etc.

2. Be sure the power supply available (voltage, fre
quency, and phase) corresponds to that specified on
the unit (230-60-1).

3. Check the electrical service provided by the utility
for the building to be sure that the service capacity
is sufficient to handle the load imposed by this unit.

4. Refer to the regulations of the service gas supplier

and the local building, heating, plumbing or other codes
in effect in the area in which installation is to be made.

5. Refer to the dimensional drawing on page 2 for
location of electrical, gas and chilled water connections

prior to setting the unit in place.

6. Model 453 chillers are not designed for operation
at outdoor ambients below 40°F.

7. When this chiller is used in conjunction with a
boiler, a 4-pipe system must be used. A common piping
system cannot be used. Use separate coils and piping.

GENERAL

Model 48-453 is a gas-fired air-cooled absorption

system which supplies chilled water to the cooling coil
and is suitable for residential and small commercial
air conditioning systems.

This unit is used for cooling only with indoor or outdoor
coil assemblies. The 48-453, can also be used in con

junction with a Bryant gas-fired furnace to provide

“all-seasons” air conditioning for warm air or cool
air as outside temperature dictates.

Multiple Chillers and Cooling Coiis

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.

Operation at Atmospheric Pressure

The chilled water tank on this unit is vented to the
atmosphere; consequently, the chilled water circuit
operates at atmospheric pressure. Therefore, conven
tional piping practices for a closed, pressurized system
do not apply for this unit.

briiant

Cancels; 39453D67

I

39453D86
8/15/71

F i L & s

I

■

¡DO NOTi ^REMOVE

w

B71285

Figure 1 - Model 453 Gas Air Conditioner

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.
When the chiller is piped with a boiler to form a com
bination heating and cooling system, provisions must
be made for a positive shutoff between the chiller tank

and the boiler.
When the boiler is in operation, the chiller tank must

be by-passed. A sediment strainer must be installed at
the chiller tank inlet when a common pipe connects
the chiller tank and boiler.

When the chiller is in operation, the boiler, of course,
should be by-passed.

Installation

Installation of Model 48-453, Series D Gas Chiller
consists of the following steps:

I. Locating and Mounting the Unit

II. Connecting Chilled Water Line

III. Making Electrical Connections

IV. .Making Gas Connections

V. Charging System with Water

VI. Checking the Unit Operation

VII. Adjusting Gas Input

VIII. Balancing the System

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

-1-

note; panel on front side

PROVIDES additional SERVICE
ACCESS.

-GAS CONNECTION

r 1"

l^HOLE-^PIPE 3!

Figure 2 - Unit Dimensional Drawing

A7C

RATINGS, CAPACITIES and COMPONENT INFORMATION

Gas Input BTUH 112,000
Power Supply (Voltage - Frequency - Phase) 230-60-1
Electrical Input
Condenser Air Flow
Refrigerant

Amount Lbs 1 1.0

Total Solution Lbs 30
Factory Test Pressure (Refrigerant Cycle)
Relief Valve Set (Refrigerant Cycle)

Operating Chiller Water Volume Gal. 3.8
Operating Chiller Water Level Above Base Inches
Internal Chilled Water Pressure Loss
Pressure in Chilled Water Tank
Nominal Chilled Water Flow Rate
Water-Solution Pump Motor

HP & Service Factor

Speed

Frame

Pulley Pitch Dia & Bore

Water Pump Pulley Pitch Dia & Bore Inches
Solution Pump Pulley Pitch Dia & Bore Inches

Belt Length & Width

Fan Motor

HP 1/3

Speed

Frame
Fan Diameter
Unit Weight

* Atmospheric

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KW 1.45
CFM 4,200
Type R-717

PSIG
PSIG

Ft Water

PSIG *0
GPM

RPM

Inches

Inches

RPM

Inches

Lbs 740

450
450

9-5/8

2.5

10

1/2-1.6

3450

48

3.09-0.50

2.74-0.628

7.03-0.626

36.5x5/16

825

48

26

LIQUID SUCTION
HEAT EXCHANGER

CONTROL BO.

\

SERVICE
VALVE D

SERVICE VALVE C

RECTIFIER

CHILLER TANK

FAN

PUMP
INLET­TANK

SERVICE
VALVE E I

PUMP ^
DISCHARGE
TANK

SUCTION DISCHARGE HYDRAULIC PUMP/
VALVE VALVE WATER PUMP MOTOR

Figure 3 - Partially Disassembled Unit (Front View)

FAN MOTOR

NONCONDENS

ABLE CUSHION

HYDRAULIC
PUMP

B71299

SAIL SWITCH

/

SERVICE

VALVE A'

ABSORBER/
CONDENSER­ASSY.

SOLUTION
COOLED ­ABSORBER

GAS INLET
CONNECTION

A643
GAS VALVE/
REGULATOR

'A-'t-T....' . . RESISTOR

- ' I _ ■. PARJ load

i ■ • - 1>C0NT SW.

BURNER PILOT PRESSURE

CAPACITOR

821 RELAY

T -»f-TRANSFORMER

LOW-VOLTAGE
TERMINAL BLOCK

MANUAL
RESET
BUTTON

POWER SUPPLY
CONNECTIONS

GENERATOR

PILOT
ADJUSTING
SCREW

PILOT

ASSEMBLY SWITCH

Figure 4A - Partially Disassembled Unit (Left Side View)

■

GAS INLET^
CONNECTION

REGULATOR

639 GAS PILOT
VALVE ADJUSTING

SCREW

Figure 4B - Partial View of Unit Equipped

with the A639 Gas Valve (Left Side View)

PILOT

ASSY.

BURNER

A70026

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I. LOCATING AND MOUNTING THE UNIT

The construction of Model 48-453 is such that the unit
can be mounted on any NONCOMBUSTIBLE base.
However, there are several conditions, or circum
stances, that result in the requirement of field supplied
supports. Some of these circumstances are:

1. When state and/or local building codes prohibit

mounting the unit directly on a base.

2. When the unit is to be placed in an area where there
is danger of standing water.

Mounting Base

The unit is supported on 3 rails attached to the bottom
of the base. These rails extend the full length of the
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 between 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 NONCOMBUSTIBLE

MATERIAL FOR THE BASE.

Rooftop Installations

1; Place the unit above a load-bearing wall whenever

possible.

2. Roof areas are susceptible to standing water; there
fore, field-supplied supports should be placed under
the unit. Allow a minimum of 6 inches clearance
between bottom of unit and roof.

Clearances

The condenser coil is located at the back of the unit
with the condenser air inlet through the rear of the unit
and the discharge through the louvered top panel.

The minimum clearance between the back of the unit
and a wall is 15 inches. If the overhang 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. See Figure 5.

II. CONNECTING CHILLED WATER LINES

Refer to the following information: “Multiple Chillers
and Cooling Coils,” page 1; “Operation at Atmospheric

TABLE I

Allowable Distances between Coil Model 405, 406, 407, 414 and Chiller (Note 1)

Pipe Size Bryant Quick-Connect Polyethylene

(Inches) Tubing (Note 2)

3/4" 42' 40' 45' 6Г

1" 90' 176' 189' 200'

Note 1: Values shown 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. All distances shown are shown on the predica
tion that only long elbows are used. Galvanized well
head elbows are used with the polyethylene pipe. When
using Bryant Quick-Connect Tubing, avoid any sharp
bends that would tend to restrict or stop the flow
of water.

Note 2: If Quick-Connect Tubing is used and coil is
above chiller water level, refer to PAM 400.2.6.

Simplified Guidelines When

Using Quick-Connect Tubing

1. Do not exceed 12 feet elevation with 3/4" Quick-

Connect.

Pressure,” page 1; and “Freezing Weather Protection,”

page 8.

Copper Galvanized

Pipe Pipe Pipe

2. Do not exceed 10 feet elevation with 1" Quick­Connect.

3. Do not exceed 15 feet of horizontal tubing at those
elevations.

4. Exercise good practice to avoid kinking, sagging
and stretching.

5. Any excess lengths should be coiled up at the lowest
elevation.

6. Polyethylene or hard pipe should be used at higher

installation.

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