Multiaqua CFFWA Series, Руководство по эксплуатации

Страница: 17 / 288

F. Pump:
1. Unit shall be capable of incorporating a field installed chilled liquid solution pump.
(Space restricted)
2. Unit shall have provisions to allow for chilled liquid solution piping to the exterior of the cabinet.
G. Evaporator:
1. Evaporator shall have two independent refrigerant circuits.
2. Rated for a refrigerant side working pressure of 450 psig and a maximum water side working
pressure of 60 psig.
3. Single pass, ANSI type 316 stainless steel, brazed plate construction.
4. Externally insulated with closed cell, elastomeric foam. (ASTM518)
H. Condenser:
1. Condenser coil shall be air-cooled with integral subcooler.
2. Two independent refrigerant circuits.
3. Constructed of rifled copper tubing mechanically bonded to aluminum fins.
4. Cleaned and dehydrated.
5. Factory leak tested to 450 psig.
I. Refrigerant Circuits:
1. Each circuit shall contain a sight glass, liquid line filter, thermal expansion valve,
refrigerant charge of R407c and POE compressor oil.
Part 3-Controls and Safeties
3.01 Controls
A. Chiller shall be completely factory wired and tested.
B. Capacity control shall be based on leaving chilled liquid solution temperature.
1. Temperature accuracy shall be + - 1.0
° F.
2. Controls shall be capable of staging the two compressors.
C. Controls shall include the following components.
1. 24vac transformer to serve all controllers relays and control components.
2. Microprocessor based liquid solution temperature controller.
3. Leaving water temperature thermistor.
4. Pump bypass timer.
5. Compressor recycle timer.
6. Optional fan cycling control for low ambient operation.
7. Chilled liquid solution flow switch.
3.02 Safeties
A. Unit shall be equipped with thermistors and all necessary components in conjunction with the
control system to provide the following protectants.
1. Low refrigerant pressure.
2. High refrigerant pressure.
3. Low chilled liquid solution temperature.
4. Low chilled liquid solution flow.
5. Thermal overload.
6. Short cycling.
Part 4-Operating Characteristics:
4.01 Temperatures
A. Unit shall be capable of starting and running at outdoor temperatures from 55
°
F to 120
°
F.
B. Optional Low Ambient Kit shall allow starting and running at outdoor temperatures to -20
°
F. A
field supplied and installed crank case heater must be used when operating at these temperatures.
C. Unit shall be capable of starting up with a maximum 80 ° F and a sustained 70 ° F entering fluid
solution temperature to the evaporator.
D. Minimum 10% Glycol solution is required. For outdoor temperatures below 32
°
F, reference
MAC Glycol Solution Data table.
4.02 Electrical Requirements
A. Primary electrical power supply shall enter the unit at a single location.
B. Electrical power supply shall be rated to withstand 120
°
F operating ambient temperature.
C. Units shall be available in 1 or 3-phase power at the voltages shown in the equipment electrical data.
D. Control points shall be accessed through terminal block.
12