Specifications

GUIDE SPECIFICATIONS 7-46 kW DX units

coil shall be in a cross circuited or interlaced “A” frame arrangement to allow maximum coil surface in a small cabinet. The large

faced coil area shall be constructed with 1/2” O.D. riﬂ ed copper tube with 12 ﬁ ns per inch of corrugated aluminum for maximum

heat transfer. Maximum face velocity shall be less than 500 feet per minute. The expansion valve shall be of the adjustable

thermostatic type with external equalization. The compressor shall be of the hermetic scroll with complete overload protection on

all three power lines, internal thermostat for winding protection, crankcase heater, sight-glass, and low pressure override timer for

positive starting at low temperatures. The circuit shall contain high and low pressure safety switches. The high and low pressure

safety switch shall be installed with Shraeder type ﬁ ttings with valve core.

Each system shall include a ﬂ oor mounted, indoor air cooled condenser section. The condenser frame shall be constructed of 14

gauge welded tubular steel and be coated with a heavy corrosion inhibiting ﬁ nish for long life. The unit shall have complete front

and side access by means of high quality furniture grade steel doors with heavy-duty hinges. The doors shall be lined with one

inch thick, 1-1/2 pound density ﬁ berglass coated with neoprene. Each door shall be provided with sure close latches, which shall

be easily removable via lift-off hinges for easy access and service. Each door shall be provided with a polyurethane gasket to

prevent air leakage.

The doors shall be painted to match or contrast with other room equipment.

The blower section shall be belt driven centrifugal type, double width, double inlet and shall be statically and dynamically bal-

anced at the factory as a complete assembly to a maximum vibration level of two mils in any plane. The blower wheel shall be a

minimum of 15 inches in diameter. The blower wheel shall be supported on a heavy steel shaft having self-aligning ball bearings

with a minimum life span of 100,000 hours. The blower wheel shall be driven by a motor mounted on an adjustable slide base.

The drive motor shall be 1750 rpm. The drive package shall be belt driven with two belts and a variable pitch sheave, sized for

200% of the fan motor horsepower.

The condenser coil shall be constructed of riﬂ ed copper tubes and corrugated aluminum ﬁ ns. The condenser coil shall be equally

circuited for the compressor. A receiver shall be factory mounted with head pressure control and solenoid valve for each circuit.

C. Air Cooled with Remote Outdoor Condensing Unit - The refrigeration system shall be split type with an indoor evaporator

section and remote outdoor condensing unit.

The indoor evaporator section shall include the cooling coil, humidiﬁ er, reheat, ﬁ lters, and controls. The cooling coil shall be in a

cross-circuited or interlaced “A” frame arrangement to allow maximum coil surface in a small cabinet. The large faced coil area

shall be constructed with 1/2” O.D. riﬂ ed copper tube with 12 ﬁ ns per inch of corrugated aluminum for maximum heat transfer.

Maximum face velocity shall be less than 500 feet per minute. The expansion valve shall be of the adjustable thermostatic type

with external equalization. The ﬁ lter-drier shall be installed prior to the expansion valve.

The doors shall be painted to match or contrast with other room equipment.

The outdoor condensing unit shall be constructed of aluminum and contain hermetic scroll compressors with complete overload

protection on all three power lines, internal thermostats for winding protection, crankcase heater, sight-glass, and low pressure

override timer for positive starting at low temperatures. The circuits shall contain high and low pressure safety switches. The

high and low-pressure safety switches shall be installed with Shraeder type ﬁ ttings with valve core.

The condensing unit shall include a low proﬁ le, slow speed, direct drive propeller fan air cooled condenser section. The air dis-

charge shall be vertical to minimize the effects of wind blowing through the coil at low ambient temperatures. The condenser coil

shall be constructed with riﬂ ed copper tube and aluminum ﬁ n. The condensing unit shall have fan speed control with transduc-

ers to modulate the speed of the ﬁ rst condenser fan motor and provide positive start-up and operation at ambient temperatures

to -20°F. Condensers with more than one fan shall utilize a pressure control on the second fan. Additional condenser fan motors

shall be controlled by ambient thermostats. All controls including the fan speed control shall be factory mounted in an integral

factory wired and tested control panel. The condensing unit shall be manufactured by the same manufacturer of the indoor unit.

D. Water/Glycol Cooled - The cooling coil shall be in a cross-circuited or interlaced “A” frame arrangement to allow maximum

coil surface in a small cabinet. The large face area coil shall be constructed of 1/2” O.D. riﬂ ed copper tube with 12 ﬁ ns per inch

of corrugated aluminum for maximum heat transfer. Maximum face velocity shall be less than 500 feet per minute. The expan-

sion valves shall be of the adjustable thermostatic type with external equalization. The compressors shall be of the hermetic scroll