Assessments - 2, GPA: 4
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Facilidade de uso
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 installations, 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, 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; the indoor coil may be pressurized when it is used with the boiler for heating. FIL N» Câpeels: 39452D70 I 39452D80 2/15/73 DO NO! REMOV Figure 1 - Model 90-452W Gas Air Conditioner When this chiller is piped with a boiler to form a combination 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. AIR OUT COIL CLEANING ACCESS PANEL Figure 2 - Dimensional Drawing RATINGS AND PERFORMANCE MODEL 90-452W Series E Unit Rating Plate (Voltage-Hertz-Phase) 200-60-1 230-60-1 Cooling Capacity Btuh 90,000 90,000 Gas Input Btuh 246,000 246,000 Condenser Air Delivery CFM 10,000 10,000 Chilled-Water Flow Rate (Nominal) GPM 18.75 18.75 Max Head at Nominal Water Flow Ft Water 37 37 Electrical Input KW 2.5 2.5 Fan Motor (2) HP & SF 1/2 & 1.0 1/2 & 1.0 Voltage Hertz-Phase 200/230-60-1 200/230-60-1 Capacitor (370 Volts) mfd 10 7.5 Hydraulic Pump Motor HP & SF 1 & 1.25 1-1/2 & 1.25 Voltage-Hertz-Phase 200-60-1 208/230-60-1 Alternate Hydraulic Pump Motor HP & SF 1 & 1.25 1 & 1.25 Voltage-Hertz-Phase 200-60-1 230-60-1 Chilled-Water Pump HP & SF 1/3 & 1.35 1/3 & 1.35 Voltage-Hertz-Phase 200-230-60-1 200-230-60-1 Refrigerant Type R717 R717 Amount Lbs 18 18 Total Solution Lbs 55 55 Bryant Sound Rating SRN 22 22 Approximate Shipping Weight Lbs 1317 1317 CONNECTIONS MODEL 90-452W Series E Unit Rating Plate (Voltage-Hertz-Phase) 200-60-1 230-60-1 Unit Ampacity for Electrical Conductor Sizing Amps 19.25 26.2 *Min Branch Circuit Wire Size AWG No. 12 10 Recommended Fuse Size Amps 35 35 **Maximum Line Length Ft 71 115 Control Circuit Volts 24 24 External Power Available VA 5 5 Gas Supply Connection Size Inches 3/4 NPT 3/4 NPT Chilled-Water Supply (NPT) Inches 1-1/4FPT 1-1/4FPT Chilled-Water Return (NPT) Inches 1 FPT 1 FPT Equalizer Line (NPT) Inches 1-1/2FPT 1-1/2 FPT *If other than 75 °C copper conductor is used, determine size from unit ampacity and the National Electric Code. Voltage drop of wire selected must be less than 2% of unit rated voltage. **Length shown is for one way along the wire path from unit to service panel. REFRIGERANT RESTRICTORS HIGH-PRESSURE (CHILLER INLET) LIMIT SWITCH RECTIFIER SECONDARY HI-TEMP LIMIT SWITCH AMBISTAT PILOT PRESSURE SWITCH REGULATOR MANUAL SHUT-OFF VALVE GAS VALVE GENERATOR PILOT HI-TEMP LIMIT SWITCH Figure 3 - Unit Front View With Access Panels Removed MAINTENANCE LABEL WATER’ PUMP CHILLED- EQUALIZER SUPPLY LINE COim Figure 4 - Unit Left-Side View With Access Panel Removed VALVE C VALVE E PUMP HEATER HYDRAULIC SOLUTION PUMP PUMPS MOTOR VALVE A VALVE D INLET CHECK VALVE Figure 5 - Unit Right-Side View With Access Panel Removed — 3 — I. LOCATING AND MOUNTING UNIT The absorption unit is approved for outdoor installation only and may be located at ground level or on the roof. Consult local or other applicable codes for information concerning proximity to property lines, height above roof, obstructions, etc. A. Mounting Base 1. USE NONCOMBUSTIBLE MATERIALS. 2. Suggested types of mounting base for ground installation : a. Precast concrete lintels. Use three lintels the depth of unit, one each under right and left ...