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036-21365-003-D-1105
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 additional 4-year war-
ranty on the compressor.
E.
Unit shall be rated in accordance with ARI 360.
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 ser-
vice.
D. Cabinet shall feature a separate access panel for
the controls so that unit airflow need not be dis-
turbed during servicing.
E.
Permanently attached base rails shall have 3-way
fork lift access and lifting holes for ease of installa-
tion.
Compressor
A.
Compressor shall be hermetic scroll.
B.
Compressor shall feature motor overload protection.
C. A crankcase heater shall keep refrigerant from dilut-
ing 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
transmission of sound and vibration.
Condenser and Fans
A.
Fan motors shall be direct-drive with propeller-type
condenser fans which discharge air vertically
upward.
B.
Fan motors shall have permanently lubricated ball-
bearings for longer wear during start and stop cycles
and shall have inherent overload protection.
Unitary Products Group
http://www.rezine.net
GUIDE SPECIFICATION - HA120
Page 23
C. Coil shall be constructed of rifled copper tubing
mechanically expanded and bonded to louvered alu-
minum fins. Coil shall include an integral subcooler.
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 accommodate gauge lines, allowing for
easy servicing
•
Filter drier shipped in unit for field installation
•
Holding charge of R-22
Controls - Unit controls shall include:
A.
24 volt control circuit with terminal blocks.
B.
Color-coded wiring for easy service and trouble-
shooting.
C. Independent line break thermal protection for the
condenser fans.
D. 5 minute anti-short cycle timer to protect the com-
pressor from frequent cycling.
E.
Unit safety lockouts which automatically reset from
the thermostat once the anti-short cycle timer is sat-
isfied. 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 pres-
sure shall be bypassed for the first 120 seconds
(approximate) of operation to eliminate nui-
sance trips.
F.
Compressor motor protection to automatically shut-
down the unit in the event of motor overcurrent or
low control voltage conditions. Unit shall automati-
cally 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.)
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.
9
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