User Guide
Table Of Contents
- Product Data
- Features/Benefits
- Model Number Nomenclature
- AHRI Capacities
- Unit Dimensions
- Unit Dimensions
- 36-60
- Accessory Dimensions
- 1. Roof curb must be set up for unit being installed.
- 2. Seal strip must be applied, as required, to unit being installed.
- 3. Roof curb is made of 16-gauge steel.
- 4. Attach ductwork to curb (flanges of duct rest on curb).
- 5. Insulated panels: 1-in. (25.4 mm) thick fiberglass 1 lb. density.
- Performance Data
- Application Data
- Electrical Data
- Connection Wiring Schematic 208/230-1-60
- Controls
- Operating Sequence
- 2. The normally open contacts of energized contactor (C) close and complete the circuit through compressor motor (COMP) to condenser (outdoor) fan motor (OFM). Both motors start instantly.
- 3. The set of normally open contacts on the interface fan board (IFB) are closed which energizes a circuit to the indoor fan motor (IFM).
- Guide Specifications
- Packaged Gas Heating/Electric Cooling Units Constant Volume Application
- HVAC Guide Specifications
- General
- Products
- Guide Specifications (Continued)
- 2. Compressor Start Kit (single phase units only):
- 3. Thermostat:
- 4. Crankcase Heater:
- 5. Economizer:
- 6. Filter Rack Kit:
- 7. Flat Roof Curb:
- 8. Flue Discharge Deflector
- 9. Low Ambient Package:
- 10. Manual Outdoor Air Damper:
- 11. Square-To-Round Duct Transitions (24-48 models):
- 12. Time Guard II
- 13. Low Pressure Switch Kit
577C--K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
33
Guide Specifications (Continued)
Ultra Low NOx:
Shall provide NOx reduction to meet 14ng/J NOx emissions
requirements as shipped from the factory.
Special Features Available:
1. Coil Options
Base unit with tin plated indoor coil hairpins available as a factory
installed option.
2. Compressor Start Kit (single phase units only):
Shall provide additional starting torque for single-phase
compressors.
3. Thermostat:
To provide for one-stage heating and cooling in addition manual or
automatic changeover and indoor fan control.
4. Crankcase Heater:
Shall provide anti-floodback protection for low-load cooling
applications.
5. Economizer:
(Horizontal - Field installed accessory)
(Vertical - Field installed accessory)
a. Economizer controls capable of providing free cooling using
outside air.
b. Equipped with low leakage dampers not to exceed 3% leakage, at
1.0 IN. W.C. pressure differential.
c. Spring return motor shuts off outdoor damper on power failure.
6. Filter Rack Kit:
Shall provide filter mounting for downflow applications. Offered as
a field installed accessory.
7. Flat Roof Curb:
Curbs shall have seal strip and a wood nailer for flashing and shall
be installed per manufacturer’s instructions.
8. Flue Discharge Deflector
Directs flue gas exhaust; 90 degrees upward from current discharge.
9. Low Ambient Package:
Shall consist of a solid-state control and condenser coil temperature
sensor for controlling condenser-fan motor operation, which shall
allow unit to operate down to 0_F (-18_C) outdoor ambient
temperature when properly installed.
10. Manual Outdoor Air Damper:
Package shall consist of damper, birdscreen, and rainhood which
can be preset to admit outdoor air for year-round ventilation.
11. Square-To-Round Duct Transitions (24-48 models):
Shall have the ability to convert the supply and return openings
from rectangular to round.
12. Time Guard II
Automatically prevents the compressor from restarting for at least 4
minutes and 45 seconds after shutdown of the compressor. Not
required when a corporate programmable thermostat is applied or
with a RTU-MP control. Offered as a field installed accessory.
13. Low Pressure Switch Kit
Kit is designed for use when a low pressure control in desired. This
kit provides added reliability for the compressor.