Bryant 452W User Manual download pdf

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.

FIL

C^els: 39452D70

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.

1 2 3 4 5 6 ... 11 12

Summary of Contents

Page 1 - Installation Instructions

Installation InstructionsGAS-FIRED AIR CONDITIONER452WSIZE 90 Series Ebri|antImportant—Read before Installing1. Check all local or other applicable c

Page 2 - CONNECTIONS

TABLE VI—Manifold Pressure (Inches W.C.)0)3'03>OQSpecific Gravity0.59 0.61 0.630.650.679003.9”4.0”4.1”4.2”4.3”9503.5”3.6”3.7”3.8”3.9”1000 3.1”

Page 3 - ' V"

NOTE 1: Field wire from terminal “F” at chiller unit must extend through hole at furnace terminal “F” and connect to cooling rel

Page 4

VFIELD LOW-VOLTAGEWIRING.-----------------------^^E^LD_HIGH-VOLTAGEMODEL 884 THERMOSTAT AND SUBBASE P/N 34427D031Figure 12 - Connecting 90-452W Chille

Page 5

COIL CLEANING ACCESS PANELAIR OUT4-5Figure 2 - Dimensionai DrawingRATiNGS AND PERFORMANCEMODELUnit Rating Plate (Voltage-Hertz-Phase)200-60-1 230-60-

Page 6 - Figure 7 - Drip Leg Location

REFRIGERANT RESTRICTORS HIGH-PRESSURE(CHILLER INLET) LIMIT SWITCH RECTIFIERSECONDARYHI-TEMPLIMITSWITCHAMBISTATPILOTPRESSURESWITCHREGULATORMANUALSHUT

Page 7

I. LOCATING AND MOUNTING UNITThe absorption unit is approved for outdoor installation only and may be located at ground level or on

Page 8 - Cooling Operation

E. Water Coil Connections1. If cooling coil is used in connection with heating unit, and heating unit is not approved for installation dow

Page 9 - Hydraulic Pump Heater

DRIP LEGWITHIN STRUCTUREA70676Figure 7 - Drip Leg Locationon the right side. Install a drip leg trap in the gas supply riser leading to the unit.The

Page 10

remove screw cap to expose adjustable screw. Turn adjusting screw until flame has desired appearance, b. Replace screw cap.V. CHILLED-WATER SYSTEMCAU

Page 11

type antifreeze to use. Step ll.gives procedure for adding Ucar-17 antifreeze. Step 12 covers procedure for adding methanol antifreeze.11. Addin

Page 12

IB2B2D2JTapped Primary Transformer Pump Heater Relay (SPST-NC) Power Relay (DPST)Circuit Breaker (Lockout Relay)Motor (Hydraulic Pump)3A2 - Motor (Wat

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Bryant 452W User Manual

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