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c. This gauge access port shall facilitate correct and accurate condenser pressure readings by enabling the
reading with the compressor access panel on.
d. The plug shall be made of a leak proof, UV--resistant, composite material.
3. Compressors
a. Unit shall use fully hermetic, scroll compressor for each independent refrigeration circuit.
b. Compressor motors shall be cooled by refrigerant gas passing through motor windings.
c. Compressors shall be internally protected from high discharge temperature conditions.
d. Compressors shall be protected from an over--temperature and over--amperage conditions by an internal,
motor overload device.
e. Compressor shall be factory mounted on rubber grommets.
f. Compressor motors shall have internal line break thermal, current overload and high pressure differential
protection.
g. Crankcase heaters shall not be required for normal operating range, unless required by compressor manufac-
turer due to refrigerant charge limits.
23 81 19.13.L.
Filter Section
1. Filters access is specified in the unit cabinet section of this specification.
2. Filters shall be held in place by a pivoting filter tray, facilitating easy removal and installation.
3. Shall consist of factory installed, low velocity, throw--away 2--in. thick fiberglass filters.
4. Filters shall be standard, commercially available sizes.
5. Only one size filter per unit is allowed.
23 81 19.13.M. Evaporator Fan and Motor
1. Evaporator fan motor:
a. Shall have permanently lubricated bearings.
b. Shall have inherent automatic--reset thermal overload protection or circuit breaker.
c. Shall have a maximum continuous bhp rating for continuous duty operation; no safety factors above that
rating shall be required.
2. Belt--driven Evaporator Fan:
a. Belt drive shall include an adjustable pitch motor pulley.
b. Shall use sealed, permanently lubricated ball--bearing type.
c. Blower fan shall be double--inlet type with forward--curved blades.
d. Shall be constructed from steel with a corrosion resistant finish and dynamically balanced.
23 81 19.13.N. Condenser Fans and Motors
1. Condenser fan motors:
a. Shall be a totally enclosed motor.
b. Shall use permanently lubricated bearings.
c. Shall have inherent thermal overload protection with an automatic reset feature.
d. Shall use a shaft--down design on 04 to 12 and 16 models and shaft--up on 14 size with rain shield.
2. Condenser Fans:
a. Shall be a direct--driven propeller type fan.
b. Shall have galvalum blades riveted to corrosion--resistant steel spiders and shall be dynamically balanced.
23 81 19.13.O. Special Features Options and Accessories
1. Staged Air Volume System (SAV) for 2--stage cooling models only:
a. Evaporator fan motor:
(1.) Shall have permanently lubricated bearings.
(2.) Shall have a maximum continuous bhp rating for continuous duty operation; no safety factors above
that rating.
(3.) Shall be Variable Frequency duty and 2--speed control.
(4.) Shall contain motor shaft grounding ring to prevent electrical bearing fluting damage by safely divert-
ing harmful shaft voltages and bearing currents to ground.
2. Variable Frequency Drive (VFD). Only available on 2--speed indoor fan motor option (SAV):
a. Shall be installed inside the unit cabinet, mounted, wired and tested.
b. Shall contain Electromagnetic Interference (EMI) frequency protection.
c. Insulated Gate Bi--Polar Transistors (IGBT) used to produce the output pulse width modulated (PWM)
waveform, allowing for quiet motor operation.
Summary of Contents for WeatherMaker 48TC**04
Page 22: ...22 CURBS WEIGHTS DIMENSIONS cont C10298A Fig 5 Dimensions 48TC 08 12 ...
Page 25: ...25 CURBS WEIGHTS DIMENSIONS cont A14149 Fig 9 Dimensions 48TC 14 ...
Page 27: ...27 CURBS WEIGHTS DIMENSIONS cont C14151 Fig 12 Dimensions 48TC 16 ...
Page 29: ...29 CURBS WEIGHTS DIMENSIONS cont C10772B Fig 15 Roof Curb Details 48TC 16 ...