IMM AGS-2
49
Field Wiring (Remote Evaporator)
Field wiring connections from the remote evaporator to the outdoor unit are shown on
Figure 23 on page 42. Additionally, sensor connections 2, 3, and 4 below, are required:
1.
The electronic expansion valve has a 30-feet long cable attached and can be used, as is,
when the outdoor unit is less than 30 feet away. Beyond that, a junction box must be
located within 30 feet of the evaporator, and up to 70 additional feet of 14GA wire
connected from the cable to the unit, allowing up to a total distance of 100 feet (30 feet
of cable and up to 70 feet of 14GA).
2.
Two evaporator water temperature sensors with 100 feet of cable coiled in the unit
control panel for extension to the evaporator and insertion in fittings located on the side
of the inlet and outlet nozzles.
3.
One suction line refrigerant temperature sensor per circuit with 100 feet of cable coiled
in the unit control panel for extension to the evaporator. Place the sensor in a brazed
well (provided in kit, installed in the field) on the suction line in a straight-flat area,
close to the suction line pressure transducer. Install with heat conductive compound
and insulate well. If installed on a horizontal pipe run, locate between the 2-4 o’clock
position.
4.
One suction line pressure transducer per circuit with 100 feet of cable coiled in the unit
control panel for extension to the evaporator. Mount the transducer in the suction line,
2-3 feet from the evaporator head, on the top or side of the pipe. Connection is ¼-inch
flare with a flare Schrader.
Kit Components
The kit shipped with the unit has the following components for field installation:
Filter-drier and cores
Sight glass
Electronic expansion valve
Solenoid valve
Evaporator vent and drain plugs
Filter-drier cores for economizer piping
Charging Valve
(Sizes AGS 180 through 210)
Refrigerant Line Sizing
Layout and size the refrigerant piping in accordance with the latest edition of the ASHRAE
Handbook. A line sizing guide can be found below. Keep the refrigerant suction line
pressure drop at close to a maximum of 2-degree F. drop in saturated temperature. Each of
the two suction line’s velocity must be sufficient to carry oil when considering a capacity
reduction of 25% in each circuit.
NOTE:
The following applies to all size units:
•
Do not run refrigerant piping underground.
•
Maximum linear line length can not exceed 75 feet.
•
Maximum total equivalent length (TEL) can not exceed 180 feet.
•
The evaporator can not be located more than 15 feet above the outdoor unit.
•
The evaporator can not be located more than 20 feet below the outdoor unit.
•
Suction line connection at unit = 3 5/8 inches
.
•
Suction line connection at evaporator = 4 1/8 inches.
•
Liquid line connection at the unit = 1 3/8.
•
Liquid line connection at the evaporator = 1 5/8.
•
A piping drawing showing altitudes, line lengths, slopes and all fittings, using Form SF
99006 (Revised 5/02), must be sent to the McQuay Technical Response Center for
review prior to entering a unit order.
•
When facing the unit control box, the left-hand compressor is circuit # 1, and the right-
hand is compressor # 2. With mix-matched compressor sizes, #1 is the smallest.
