I. General
A. Units shall be manufactured in a facility registered under
the ISO 9002 manufacturing quality standard.
B. Units shall be UL listed to US and Canadian safety
standards.
C. Unit shall be packaged to allow outdoor storage.
D. Warranty shall be a full year limited parts warranty on the
complete unit with an additonal 4-year warranty on the
compressor.
E. Unit shall be rated in accordance with ARI 360.
II. Unit Cabinet
A. Cabinet shall be constructed of 18 gauge, zinc-coated
steel, finished with a powder paint process capable of
withstanding a minimum of 750 salt spray hours
according to ASTM B117.
B. Cabinet screws shall comply with the ASTM B117 salt
spray test for a minimum of 750 hours.
C. Panels shall be removable for easy access to all internal
components during maintenance and service.
D. Cabinet shall feature a separate access panel for the
controls so that unit airflow need not be disturbed during
servicing.
E. Permanently attached base rails shall have 3-way fork lift
access and lifting holes for ease of installation.
III. Compressor
A. Compressors shall be hermetic scroll.
B. Compressor shall feature motor overload protection.
C. A crankcase heater shall keep refrigerant from diluting
the compressor oil in the sump. Crankcase heater shall
be field replaceable without removal of the charge.
D. Neoprene isolators shall be used to minimize the trans-
mission of sound and vibration.
E. Compressor sets shall have two stages, with unloading
accomplished through turning off one compressor.
IV. Condenser and Fans
A. Fan motors shall be direct-drive with propeller-type con-
denser fans which discharge air vertically upward.
B. Fan motors shall have permanently lubricated ball-bear-
ings for longer wear during start and stop cycles and
shall have inherent overload protection.
C. Coil shall be constructed of rifled copper tubing mechani-
cally expanded and bonded to louvered aluminum fins.
Coil shall include an integral subcooler.
V. Refrigeration Components - Refrigeration system
shall contain the following:
•
High and low pressure cut-outs
•
Suction and liquid line service valves to ease installation
and recovery of refrigerant
•
External ports to accomodate gauge lines, allowing for easy
servicing
•
Filter drier shipped in unit for field installation
•
Holding charge of R-22
VI. Controls - Unit controls shall include:
A. 24 volt control circuit with terminal blocks.
B. Color-coded wiring for easy service and troubleshooting
C Independent line break thermal protection for the
condenser fans.
D. 5 minute anti-short cycle timer to protect the compressor
from frequent cycling.
E. Unit safety lockouts which automatically reset from the
thermostat once the anti-short cycle timer is satisfied.
Safety lockouts will also generate a 24 volt signal to the
"X" terminal, allowing notification to the user via the
thermostat fault light (if present). These safety lockouts
shall include:
1. High refrigerant pressure
2. Low refrigerant pressure. Low refrigerant pressure shall
be bypassed for the first 120 seconds (approximate) of
operation to eliminate nuisance trips.
F. Compressor motor protection to automatically shutdown
the unit in the event of motor overcurrent or low control
voltage conditions. Unit shall automatically restart after
satisfying the anti-short cycle timer.
G. Low ambient operation down to 35
°
F without a low
ambient kit. (Operation down to 0
°
F with the optional
low ambient kit.)
VII. Electrical
A. Units shall be ______ volts, 3 phase, with a single power
point connection.
B. Unit control circuit shall have a 24 volt transformer, sized
sufficiently to operate the indoor fan.
C. All condenser fan motors and the secondary of each
transformer shall be grounded.
VIII. Accessories and Options
A. Head Pressure Control
Shall include a condenser fan motor and a pressure
controller, allowing operation of the condensing unit
down to 0
°
F.
GUIDE SPECIFICATION - H*CE180 THROUGH 240
550.23-TG3Y
Unitary Products Group
9
