Bryant 452W - Manual

Installation Instructions
GAS-FIRED AIR CONDITIONER
452W
SIZE 90
Series E
bri|ant
Important—Read before Installing
1. Check all local or other applicable codes for in­
formation concerning proximity to property lines,
height above roof, obstructions, etc.
2. Be sure the power supply available (voltage,
frequency, and phase) corresponds to that
specified on the unit rating plate.
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 serving gas sup­
plier and the local building, heating, plumbing,
or other codes in effect in the area in which in­
stallation is to be made.
5. Refer to the dimensional drawing on page 2 for
location of electrical, gas, and chilled-water con­
nections prior to setting the unit in place.
GENERAL
Model 90-452W is a gas-fired air-cooled absorption
unit designed to satisfy the cooling needs of com­
mercial and industrial buildings. This absorption unit
supplies chilled water for cooling with Bryant’s indoor
and outdoor coil assemblies.
Multiple Chillers and Cooling Coils
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 in­
stallations, it is recommended that only Models 452
and 452W be interconnected. Interconnection of sizes
60, 90, and 120 is permissible, but the use of other
model chillers with Models 452 and 452W 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 atmospheric pressure. Therefore, con­
ventional 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; the in­
door coil may be pressurized when it is used with the
boiler for heating.
F I L
OP
C^els: 39452D70
I
39452D80
2/15/73
DO NOl
REMOV
Figure 1 - Model 90-452W Gas Air Conditioner
When this 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 bypassed. 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 bypassed.
Installation
Installation of the Model 90-452W, Series E Gas
Chiller 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. Chilled-Water System
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 instruction before starting
the installation.