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.
6
Physical Data
UNIT SIZE 24040 24060 30040 30060 36060 42060 42090 48090 60090
NOMINAL CAPACITY (ton) 2 2 2-1/2 2-1/2 3 3-1/2 3-1/2 4
SHIPPING WEIGHT lb.
SHIPPING WEIGHT (kg)
339
154
339
154
348
158
348
158
394
179
428
194
428
194
481
218
COMPRESSOR / QUANTITY Scroll / 1
REFRIGERANT (R-410A)
Quantity lb.
Quantity (kg)
6.4
2.9
6.4
2.9
6.0
2.7
6.0
2.7
5.75
2.6
6.0
2.7
6.0
2.7
9.0
4.1
REFRIGERANT METERING DEVICE Orifice
ORIFICE ID in. / mm .059 / 1.5 .059 / 1.5 .063 / 1.60 .063 / 1.60 .070 / 1.78 .073 / 1.85 .073 /1.85 .080 / 2.03
OUTDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
1..21
11.9
1...21
11.9
1...21
13.6
1...21
13.6
1...21
13.6
1...21
13.6
1...21
13.6
1...21
23.3
OUTDOOR FAN
Nominal CFM
Diameter in.
Diameter (mm)
Motor Hp (Rpm)
2500
24
609.6
1/12 (810)
2500
24
609.6
1/12 (810)
3200
24
609.6
1/5 (810)
3200
24
609.6
1/5 (810)
3500
26
660.4
1/2 (810)
3500
26
660.4
3/4 (810
3500
26
660.4
3/4 (810)
3500
26
660.4
1/5 (810)
INDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
3...17
3.7
3...17
3.7
3...17
3.7
3...17
3.7
2...17
5.6
3...17
4.7
3...17
4.7
3...17
5.6
INDOOR BLOWER
Nominal Cooling Airflow (CFM)
Size in.
Size (mm.)
Motor HP (RPM)
750
10x10
254x254
1/2 (1050)
750
10x10
254x254
1/2 (1050)
950
10x10
254x254
1/2 (1050)
950
10x10
254x254
1/2 (1050)
1150
11x10
279.4x254
3/4 (1000)
1350
11x10
279.4x254
1/2 (1050)
1350
11x10
279.4x254
1/2 (1050)
1600
11x10
279.4x254
1.0 (1075)
FURNACE SECTION
*
Burner Orifice No. (Qty...Drill Size)
1 & 3 Phase Ultra Low NOx Natural Gas
(Factory Installed)
*. Based on altitude of 0 to 2000 ft (0-610 m).
1...0.125”
size 1...#28
1...0.125”
size 1...#28 1...#28 1...#28 1...#18 1...#18
HIGH-PRESSURE SWITCH
(psig) Cut-out Reset (Auto)
650 +/- 15
420 +/- 25
LOSS-OF-CHARGE / LOW-PRESSURE
SWITCH (Liquid Line) (psig) cut-out Reset
(auto)
NA
RETURN-AIR FILTERS
†
‡
Throwaway Size in.
(mm)
†. Required filter sizes shown are based on the larger of the AHRI (Air Conditioning Heating and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300 to 350 ft/minute for
throwaway type. Air filter pressure drop for non-standard filters must not exceed 0.08 IN. W.C.
‡. If using accessory filter rack refer to the filter rack installation instructions for correct filter sizes and quantity
NA - Not Available
2 each 20x12x1
508x305x25
1 each
24x16x1
610x406x25
24x18x1
610x457x25
1 each 24x14x1
610x356x25
24x16x1
610x406x25
1 each
24x16x1
610x406x25
24x18x1
610x457x25