Bryant SERIES D 453 - Manual

Installation Instructions
GAS-FIRED AIR CONDITIONER
Size 48
Series D
453
briiant
Cancels; 39453D67
I
39453D86
8/15/71
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.
I
F i L & s
■
¡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.
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