bryant 577C-K Ultra Low NOx Air Conditioner and Gas Furnace System User Guide

: June 9, 2024
: bryant

Table of Contents

577C-K Ultra Low NOx Air Conditioner and Gas Furnace System
References
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577C-K Ultra Low NOx Air Conditioner and Gas Furnace System

577C–K Ultra Low NOx: Product Data

577C–K Ultra Low NOx LegacyTM13.4 SEER2 Single-Packaged Air Conditioner and Gas Furnace System with Puron® (R-410A) Refrigerant Single Phase 2-5 Nominal Tons (Sizes 24-60) Three Phase 3-5 Nominal Tons (Sizes 36-60)

Product Data

Fig. 1 Unit 577C

A09033

Single-Packaged Products with Energy-Saving Features and Puron® R-410A refrigerant.

· 13.4 SEER2

· 10.6 EER2

· 81.0% AFUE (Single phase and three phase models)

· ECM Blower Motor-Standard

· Direct Spark Ignition

· Low Sound Levels

· Dehumidification Feature

· Louvered Condenser Coil Guard-Standard

Features/Benefits
One-piece heating and cooling units with low sound levels, easy installation, low maintenance, and dependable performance.
Puron is Bryant’s unique refrigerant designed to be environmentally balanced. Puron is an HFC refrigerant which does not contain chlorine that can harm the ozone layer. The most important advantage of Puron refrigerant is that it has not been banned in future air conditioning systems as the traditional refrigerant R-22 has been. Puron refrigerant is in service in millions of systems proving highly reliable and is non-ozone depleting.
Easy Installation
Factory-assembled package is a compact, fully self-contained, combination gas heating/electric cooling unit that is prewired, pre-piped, and pre-charged for minimum installation expense. These units are available in a variety of standard and optional heating/ cooling size combinations with voltage options to meet residential and light commercial requirements. Units are lightweight and install easily on a rooftop or at ground level. The high tech composite base eliminates rust problems associated with ground level applications.

Innovative Unit Base Design
On the inside a high-tech composite material will not rust and incorporates a sloped drain pan which improves drainage and helps inhibit mold, algae and bacterial growth. On the outside metal base rails provide added stability as well as easier handling and rigging.
Convertible Duct Configuration
Unit is designed for use in either downflow or horizontal applications. Each unit is converted from horizontal to downflow and includes two horizontal duct covers. Downflow operation is provided in the field to allow vertical ductwork connections. The basepan seals on the bottom openings to ensure a positive seal cin the vertical airflow mode.
Efficient operation high-efficiency design offers SEER2 (Seasonal Energy Efficiency Ratios) of 13.4, 10.6 EER2, and AFUE (Annual Fuel Utilization Efficiency) ratings of 81.0%.
Energy-saving, direct spark ignition saves gas by operating only when the room thermostat calls for heating. Standard units are furnished with natural gas controls.
Ultra Low NOx units meet California air quality district standards requiring NOx emissions no more than 14ng/J.
Durable, Dependable Components
Turbo-tubularTM heat exchangers are constructed of stainless steel for corrosion resistance and optimum heat transfer for improved efficiency. The tubular design permits hot gases to make multiple passes across the path of the supply air.
In addition, dimples located on the heat exchanger walls force the hot gases to stay in close contact with the walls, improving heat transfer.
ECM Blower Motor is standard on all models.
Direct-drive PSC (Permanent Split Capacitor) condenser-fan motors are designed to help reduce energy consumption and provide for cooing operation down to 40°F (4.4°C) outdoor temperature. Motormaster® II low ambient kit is available as a field-installed accessory.
Thermostat Controls
Time Guard® II anti-short cycle protection circuitry. If a non-corporate thermostat without anti-short cycle protection is used the Time Guard II field-installed anti-short cycle kit is recommended.
Refrigerant system is designed to provide dependability. Liquid filter driers are used to promote clean, unrestricted operation. Each unit leaves the factory with a full refrigerant charge. Refrigerant service connections make checking operating pressures easier.
High pressure switch provides added reliability for the compressor.
Indoor and outdoor coils are computer-designed for optimum heat transfer and efficiency. The indoor coil is fabricated from aluminum tube and aluminum fins and is located inside the unit for protection against damage. The outdoor coil is internally mounted on the top tier of the unit.
Low sound ratings ensure a quiet indoor and outdoor environment with sound ratings as low as 70.7 dBA.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 1

577C–K Ultra Low NOx: Product Data
Easy to service cabinets provide easy 3-panel accessibility to serviceable components during maintenance and installation. The basepan with integrated drain pan provides easy ground level` installation with mounting pad. A nesting feature ensures a positive basepan to roof curb seal when the unit is roof mounted. A convenient 3/4-in. (19.05 mm) wide perimeter flange makes frame mounting on a rooftop easy. Standard horizontal metal duct covers with insulation come with the unit and cover the horizontal duct openings. These can be left in place if the units are converted to downflow.
Table of Contents
Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 AHRI Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Electrical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Connection Wiring Schematic 208/230-1-60 . . . . . . . . . . . . . . . . . . . . 27 Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Integrated Gas Control (IGC) board provides safe and efficient control of heating and simplifies trouble-shooting through its built-in diagnostic function.
Cabinets are constructed of heavy duty, phosphated, zinc-coated prepainted steel capable of withstanding 500 hours in salt spray. Interior surfaces of the evaporator/heat exchanger compartment are insulated with cleanable semi- rigid insulation board, which keeps the conditioned air from being affected by the outdoor ambient temperature and provides improved indoor air quality. (Conforms to American Society of Heating, Refrigeration and Air Conditioning Engineers 62.2.) The sloped drain pan minimizes standing water in the drain. An external drain is provided.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 2

577C–K Ultra Low NOx: Product Data
Model Number Nomenclature
Use of the AHRI Certified TM Mark indicates a manufacturer’s participation in the program For verification of certification for individual products, go to www.ahridirectory.org.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 3

577C–K Ultra Low NOx: Product Data

AHRI* Capacities Cooling Capacities and Efficiencies

UNIT SIZE
24 30 36 42 48 60

NOMINAL TONS
2 2.5 3 3.5 4 5

STANDARD CFM
750 950 1150 1350 1600 1750

COOLING
CAPACITY 22800 28000 33800 39000 47000

EER2
10.6 10.6 10.6 10.6 10.6 10.6

*. Air Conditioning, Heating & Refrigeration Institute. . Rated in accordance with U.S. Government DOE Department of Energy) test procedures and/or AHRI Standards 210/240. . At “A” conditions-80°F (26.7°C) indoor db/67°F (19.4°C) indoor wb & 95°F (35°C) outdoor db. **. Rated in accordance with AHRI Standard 270. Notes: 1. Ratings are net values, reflecting the effects of circulating fan heat. Ratings are based on: Cooling Standard: 80°F (26.7°C) db, 67°F wb (19.4°C) indoor entering-air temperature and 95°F db (35°C) outdoor entering-air temperature. 2. Before purchasing this appliance, read important energy cost and efficiency information available from your retailer. LEGEND dB-Sound Levels (decibels) db–Dry Bulb SEER–Seasonal Energy Efficiency Ratio wb–Wet Bulb COP-Coefficient of Performance

Gas Heating Capacities and Efficiencies, Single and Three Phase Models

Unit Size

Heating Input (Btuh)

Output Capacity (Btuh) Temperature Rise Range °F (°C)

24040 30040

45,000

37,000

25-55 (14-31)

24060 30060 36060 42060

60,000

49,000

25-55 (14-31)

42090 48090 60090

89,000

73,000

35-65 (19-36)

LEGEND
AFUE–Annual Fuel Utilization Efficiency
NOTE: Before purchasing this appliance, read important energy cost and efficiency information available from your retailer.
A-Weighted Sound Power Level

UNIT SIZE

STANDARD RATING (dBA)

125

TYPICAL OCTAVE BAND SPECTRUM (dBA without tone adjustment)

250

500

1000

2000

4000

24

70.7

59.4

58.5

58.3

60.4

56.7

52.6

30

73.4

53.8

59.9

62.3

64.0

61.4

53.8

36

74.8

67.1

60.3

64.3

63.8

61.9

57.1

42

74.9

62.5

63.1

63.7

65.5

61.5

57.5

48

75.4

64.1

61.0

65.5

63.7

61.8

60.1

60

NOTE: Tested in compliance with AHRI 270 but not listed with AHRI.

SEER2** 13.4 13.4 13.4 13.4 13.4 13.4
AFUE (%) 81.0
81.0
81.0
8000 46.9 45.6 50.8 53.5 56.1

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 4

577C–K Ultra Low NOx: Product Data
COIL FILTE R
ECONOMIZER

ECONOMIZER

SIDE VIEW COIL

CAULK BOTTOM CORNER OF ECONOMIZER ON EACH SIDE
FI LTER
ECONOMIZER

FLANGE ON BASE

BASE DETAIL

Vertical Economizer

FILTER RACK
BEND FLANGE AT 90° -SCREW TO DIVIDER WITH 1-IN. (25 mm)SCREW TOP FILTER RACK EV APORATOR COIL
BOTTOM FILTER RACK

Horizontal Economizer
MANUAL OUTSIDE AIR DAMPER
REPLACEMENT PANEL
MANUAL OUTSIDE AIR HOOD
DAMPER BLADE

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 5

A09375

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
NOMINAL CAPACITY (ton)
SHIPPING WEIGHT lb. SHIPPING WEIGHT (kg)
COMPRESSOR / QUANTITY
REFRIGERANT (R-410A) Quantity lb. Quantity (kg)
REFRIGERANT METERING DEVICE
ORIFICE ID in. / mm
OUTDOOR COIL Rows…Fins/in. Face Area (sq ft)
OUTDOOR FAN Nominal CFM Diameter in. Diameter (mm) Motor Hp (Rpm)
INDOOR COIL Rows…Fins/in. Face Area (sq ft)
INDOOR BLOWER Nominal Cooling Airflow (CFM) Size in. Size (mm.) Motor HP (RPM)
FURNACE SECTION* Burner Orifice No. (Qty…Drill Size) 1 & 3 Phase Ultra Low NOx Natural Gas (Factory Installed)
HIGH-PRESSURE SWITCH (psig) Cut-out Reset (Auto)
LOSS-OF-CHARGE / LOW-PRESSURE SWITCH (Liquid Line) (psig) cut-out Reset (auto)

24040 2
339 154
6.4 2.9
.059 / 1.5
1..21 11.9
2500 24
609.6 1/12 (810)
3…17 3.7
750 10×10 254×254 1/2 (1050)
1…0.125″ size

RETURN-AIR FILTERS Throwaway Size in. (mm)

24060 2
339 154

30040 2-1/2
348 158

30060

36060

2-1/2

3

348

394

158

179

Scroll / 1

42060 3-1/2
428 194

42090 3-1/2
428 194

48090 4
481 218

6.4 2.9
.059 / 1.5

6.0 2.7
.063 / 1.60

6.0

5.75

2.7

2.6

Orifice

.063 / 1.60 .070 / 1.78

6.0

2.7

.073 / 1.85 .073 /1.85

9.0 4.1
.080 / 2.03

1…21 11.9

1…21 13.6

1…21 23.3

2500 24
609.6 1/12 (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)

3…17 3.7

2…17 5.6

3…17 4.7

3…17 5.6

750 10×10 254×254 1/2 (1050)

950 10×10 254×254 1/2 (1050)

1150 11×10 279.4×254 3/4 (1000)

1350 11×10 279.4×254 1/2 (1050)

1600 11×10 279.4×254 1.0 (1075)

1…#28

1…0.125″ size

2 each 20x12x1 508x305x25

1…#28

650 +/- 15 420 +/- 25

NA

1 each 24x16x1 610x406x25 24x18x1 610x457x25

1…#28

1…#18

1 each 24x14x1 610x356x25 24x16x1 610x406x25

1 each 24x16x1 610x406x25 24x18x1 610x457x25

60090

*. Based on altitude of 0 to 2000 ft (0-610 m). . 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

577C–K Ultra Low NOx: Product Data
Unit Dimensions 24-30
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 7

577C–K Ultra Low NOx: Product Data
Unit Dimensions 36-60

A221498

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 8

A221499

577C–K Ultra Low NOx: Product Data

SMALL/COMMON CURB

SUPPLY AIR

SMALL BASE UNIT

RETURN AIR

LARGE BASE UNIT

UNIT PLACEMENT ON COMMON CURB

LARGE CURB

SMALL OR LARGE BASE UNIT

Accessory Dimensions

A180216

Unit Size Catalog Number

A IN. (mm)

B (small / common base)
IN. (mm)*

B (large base) IN. (mm)*

C IN. (mm)

D IN. (mm)

E IN. (mm)

F IN. (mm)

G IN. (mm)

H IN. (mm)

Small or Large

CPRFCURB011B00 14 (356)

Large CPRFCURB013B00 14 (356)

10 (254) 14 (356)

14 (356)

16 (406)

47.8 (1214)

32.4 (822)
43.9 (1116)

30.6 (778) 2.7 (69)
42.2 (1072)

46.1 (1170)

Part Number CPRCURB011B00 can be used on both small and large basepan units. The cross supports must be located based on whether the unit is a small basepan or a large basepan. NOTES:
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.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 9

577C–K Ultra Low NOx: Product Data
Selection Procedure (With Example)
DETERMINE COOLING AND HEATING REQUIREMENTS AT DESIGN CONDITIONS: Given: Required Cooling Capacity (TC) …………………………………46,000 Btuh Sensible Heat Capacity (SHC)…………………………………….34,000 Btuh Required Heating Capacity …………………………………………72,000 Btuh Condenser Entering Air Temperature …………………………. 95°F (35°C) Indoor-Air Temperature ………………80°F (27°C) edb 67°F (19°C) ewb Evaporator Air Quantity………………………………………………. 1600 CFM External Static Pressure ………………………………………… 0.440 IN. W.C. Electrical Characteristics ……………………………………………….. 208-1-60 SELECT UNIT BASED ON REQUIRED COOLING CAPACITY Enter Net Cooling Capacities table at condenser entering temperature of 95°F (35°C). Unit 48 at 1600 CFM and 67°F (19°C) ewb (entering wet bulb) will provide a total capacity of 47,000 Btuh and a SHC of 35,000 Btuh. Calculate SHC correction, if required, using Note 4 under Cooling Capacities tables.

SELECT ELECTRIC HEAT

In the Gas Heating Capacities and Efficiencies table, note that the 48090 unit will provide 73,000 Btuh with an input of 89,000 Btuh.

DETERMINE FAN SPEED AND POWER REQUIREMENTS AT DESIGN CONDITIONS.

Before entering the air delivery tables, calculate the total static pressure required. From the given example, the Wet Coil Pressure Drop Table, and the Filter Pressure Drop Table:

External Static Pressure

0.30 IN. W.C

Filter

0.06 IN. W.C

Wet Coil Pressure Drop

0.07 IN. W.C

Total Static Pressure

0.43 IN. W.C

At 0.43 IN. W.C. ESP (external static pressure) and MED speed the motor delivers between 1664 CFM and 1627 cfm. Interpolation estimates 1653 CFM at .43 IN. W.C. Thus, MED delivers CFM needed.

SELECT UNIT THAT CORRESPONDS TO POWER SOURCE AVAILABLE.

The Electrical Data Table shows that the unit is designed to operate at 208-1-60.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 10

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 11

Performance Data 24 Size

Evaporator Air

CFM

EWB °F(°C)

75 (23.9) Capacity MBtuh
Total Sens

Total Sys KW**

57 (13.8)

23.62

1.55

62 (16.6)

24.47

21.38

1.56

700

63* (17.2)

24.99

17.43

1.56

67 (19.4)

27.02

18.13

1.55

72 (22.2)

29.59

14.70

1.55

57 (13.8)

24.74

1.57

62 (16.6)

25.14

23.06

1.57

800

63* (17.2)

25.59

18.60

1.57

67 (19.4)

27.63

19.36

1.56

72 (22.2)

30.16

15.42

1.56

57 (13.8)

25.69

1.58

62 (16.6)

25.74

1.58

900

63* (17.2)

26.07

19.72

1.58

67 (19.4)

28.08

20.52

1.58

72 (22.2)

30.58

16.10

1.58

85 (29.4) Capacity MBtuh Total Sens

Total Sys KW**

21.90 21.90 1.75

22.45 20.24 1.75

22.88 16.39 1.76

24.79 17.09 1.76

27.20 13.77 1.76

22.92 22.92 1.77

23.07 21.80 1.78

23.43 17.53 1.77

25.32 18.28 1.77

27.69 14.48 1.77

23.77 23.77 1.79

23.81 23.81 1.79

23.84 18.62 1.79

25.72 19.42 1.79

28.07 15.15 1.79

Condenser Entering Air Temperatures °F (°C)

95 (35)

105 (40.6)

Capacity MBtuh Total Sens

Total Sys KW**

Capacity MBtuh Total Sens

Total Sys KW**

20.07 20.07 1.95 17.88 17.88 2.14

20.32 19.02 1.96 17.92 17.92 2.14

20.71 15.32 1.96 18.05 14.06 2.15

22.51 16.03 1.98 19.92 14.86 2.20

24.84 12.86 1.99 22.48 11.95 2.24

21.02 21.02 1.99 18.78 18.78 2.19

21.05 21.05 1.99 18.81 18.81 2.19

21.18 16.43 1.99 18.51 15.14 2.18

23.00 17.20 2.00 20.41 16.03 2.24

25.27 13.55 2.01 22.88 12.64 2.26

21.80 21.80 2.01 19.55 19.55 2.23

21.84 21.84 2.01 19.58 19.58 2.23

21.55 17.49 2.01 18.84 16.17 2.20

23.37 18.31 2.02 20.82 17.17 2.26

25.58 14.21 2.02 23.17 13.29 2.28

115 (46.1)

Capacity MBtuh Total Sens

Total Sys KW**

15.87 15.87 2.38

15.90 15.90 2.38

15.56 12.87 2.36

17.28 13.67 2.42

19.68 10.89 2.51

16.65 16.65 2.42

16.68 16.68 2.42

15.93 13.90 2.39

17.67 14.78 2.45

20.12 11.62 2.53

17.32 17.32 2.46

17.35 17.35 2.46

16.24 14.87 2.42

17.98 15.84 2.48

20.45 12.30 2.56

125 (51.7)

Capacity MBtuh Total Sens

Total Sys KW**

14.01 14.01 2.64

14.03 14.03 2.64

13.28 11.77 2.61

14.91 12.59 2.67

17.14 9.92

2.77

14.70 14.70 2.69

14.72 14.72 2.69

13.61 12.73 2.64

15.25 13.64 2.71

17.47 10.60 2.80

15.29 15.29 2.73

15.31 15.31 2.73

13.92 13.92 2.67

15.54 14.63 2.74

17.73 11.25 2.83

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 12

Performance Data 30 Size

Evaporator Air

CFM

EWB °F(°C)

75 (23.9)

Capacity MBtuh

Total

Sens

Total Sys KW**

Condenser Entering Air Tempeatures °F (°C)

85 (29.4)

95 (35)

105 (40.6)

Capacity MBtuh

Total

Sens

Total Sys KW**

Capacity MBtuh

Total

Sens

Total Sys KW**

Capacity MBtuh

Total

Sens

Total Sys KW**

115 (46.1)

Capacity MBtuh

Total

Sens

Total Sys KW**

57 (13.9)

27.39

1.98

26.29

2.20

25.01

2.44

23.52

2.69

21.57

2.94

62 (16.7)

28.22

26.10

1.99

26.84

25.48

2.20

25.28

24.73

2.45

23.38

2.68

21.59

2.94

875

63* (17.2)

28.70

21.18

1.99

27.33

20.58

2.20

25.77

19.89

2.45

23.74

19.00

2.69

21.18

17.90

2.93

67 (19.4)

30.96

21.97

2.00

29.59

21.44

2.22

28.06

20.82

2.46

26.21

20.08

2.74

23.74

19.09

3.02

71 (21.7)

33.22

18.60

2.02

31.86

18.10

2.24

30.33

17.53

2.48

28.62

16.90

2.76

26.55

16.13

3.08

57 (13.9)

28.61

2.01

27.47

2.22

26.20

2.47

24.68

2.75

22.66

3.00

62 (16.7)

28.93

28.00

2.01

27.59

27.35

2.23

26.34

26.18

2.47

24.72

2.75

22.70

3.00

1000

63* (17.2)

29.30

22.46

2.01

27.91

21.89

2.23

26.32

21.22

2.47

24.35

20.38

2.73

21.72

19.26

2.97

67 (19.4)

31.55

23.29

2.03

30.16

22.79

2.24

28.60

22.20

2.49

26.76

21.49

2.77

24.30

20.55

3.06

71 (21.7)

33.80

19.48

2.05

32.41

19.01

2.26

30.84

18.46

2.51

29.10

17.84

2.79

27.04

17.11

3.11

57 (13.9)

29.58

2.03

28.44

2.25

27.15

2.50

25.62

2.78

23.61

3.06

62 (16.7)

29.56

2.03

28.82

27.88

2.25

27.19

2.50

25.66

2.78

23.65

3.06

1125

63* (17.2)

29.76

23.65

2.04

28.33

23.11

2.25

26.76

22.46

2.50

24.80

21.66

2.77

22.16

20.54

3.01

67 (19.4)

31.99

24.51

2.05

30.58

24.06

2.27

29.00

23.49

2.51

27.19

22.82

2.79

24.77

21.94

3.11

71 (21.7)

34.23

20.29

2.07

32.81

19.85

2.29

31.24

19.31

2.54

29.45

18.71

2.82

27.39

18.01

3.13

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 13

Performance Data 36 Size

Evaporator Air

CFM

EWB °F(°C)

75 (23.9) Capacity MBtuh
Total Sens

Total Sys KW**

57 (13.8)

34.58

2.40

62 (16.6)

36.10

31.44

2.41

1000

63* (17.2)

36.53

25.60

2.42

67 (19.4)

39.44

26.70

2.43

72 (22.2)

43.05

21.95

2.46

57 (13.8)

36.19

2.46

62 (16.6)

37.15

33.84

2.46

1150

63* (17.2)

37.52

27.28

2.47

67 (19.4)

40.47

28.51

2.48

72 (22.2)

44.12

23.06

2.51

57 (13.8)

37.56

2.51

62 (16.6)

38.06

35.99

2.51

1300

63* (17.2)

38.23

28.87

2.51

67 (19.4)

41.26

30.24

2.53

72 (22.2)

44.94

24.09

2.56

85 (29.4) Capacity MBtuh Total Sens

Total Sys KW**

32.46 32.46 2.66

33.65 29.92 2.67

34.01 24.25 2.67

36.74 25.34 2.69

40.11 20.71 2.72

33.98 33.98 2.71

34.60 32.19 2.72

34.89 25.86 2.72

37.67 27.07 2.74

41.04 21.76 2.77

35.24 35.24 2.77

35.47 34.14 2.77

35.57 27.41 2.77

38.33 28.73 2.79

41.77 22.75 2.82

Condenser Entering Air Temperatures °F (°C)

95 (35)

105 (40.6)

Capacity MBtuh Total Sens

Total Sys KW**

Capacity MBtuh Total Sens

Total Sys KW**

30.31 30.31 2.94 28.08 28.08 3.27

31.16 28.38 2.95 28.62 26.75 3.27

31.48 22.90 2.95 28.86 21.49 3.28

34.00 23.95 2.97 31.20 22.53 3.30

37.12 19.45 3.00 34.07 18.16 3.32

31.67 31.67 3.00 29.30 29.30 3.32

32.03 30.46 3.00 29.42 29.41 3.32

32.23 24.43 3.01 29.50 22.95 3.33

34.80 25.60 3.03 31.88 24.11 3.35

37.93 20.44 3.06 34.77 19.10 3.38

32.79 32.79 3.05 30.30 30.30 3.38

32.84 32.84 3.05 30.34 30.34 3.38

32.80 25.90 3.05 29.99 24.35 3.38

35.38 27.20 3.08 32.36 25.62 3.40

38.55 21.38 3.11 35.28 19.98 3.43

115 (46.1)

Capacity MBtuh Total Sens

Total Sys KW**

25.78 25.78 3.65

26.05 25.03 3.65

26.20 20.05 3.65

28.34 21.07 3.67

30.95 16.85 3.69

26.84 26.84 3.70

26.90 26.90 3.70

26.72 21.43 3.70

28.91 22.56 3.72

31.54 17.73 3.74

27.71 27.71 3.75

27.75 27.75 3.75

27.14 22.76 3.75

29.31 24.01 3.76

31.96 18.56 3.79

125 (51.7)

Capacity MBtuh Total Sens

Total Sys KW**

23.44 23.44 4.08

23.48 23.48 4.08

23.49 18.58 4.08

25.45 19.58 4.09

27.81 15.51 4.11

24.34 24.34 4.12

24.38 24.38 4.12

23.92 19.88 4.12

25.90 20.99 4.14

28.28 16.32 4.16

25.08 25.08 4.17

25.12 25.12 4.17

24.25 21.11 4.17

26.22 22.34 4.18

28.62 17.10 4.21

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 14

Performance Data 42 Size

Evaporator Air

75 (23.9)

85 (29.4)

Condenser Entering Air Temperatures °F (°C)

95 (35)

105 (40.6)

115 (46.1)

125 (51.7)

CFM 1175 1350 1525

EWB °F(°C)
57 (13.8)
62 (16.6)
63 (17.2)
67 (19.4)
72 (22.2)
57 (13.8)
62 (16.6)
63 (17.2)
67 (19.4)
72 (22.2)
57 (13.8)
62 (16.6)
63* (17.2)
67 (19.4)
72 (22.2)

Capacity MBtuh Total Sens 38.66 38.66 40.29 35.16 41.08 28.70 44.34 29.79 48.52 24.17 40.50 40.50 41.38 37.85 42.06 30.61 45.33 31.78 49.45 25.33 41.99 41.99 42.32 40.26 42.81 32.42 46.08 33.66 50.14 26.41

Total Sys KW** 2.51 2.54 2.54 2.59 2.66 2.58 2.59 2.60 2.64 2.72 2.63 2.64 2.65 2.70 2.78

Capacity MBtuh Total Sens 36.66 36.66 37.87 33.90 38.62 27.55 41.80 28.66 45.92 23.18 38.39 38.39 38.93 36.52 39.52 29.42 42.72 30.67 46.79 24.36 39.82 39.82 39.90 39.90 40.22 31.23 43.40 32.57 47.44 25.44

Total Sys KW** 2.87 2.90 2.92 2.97 3.05 2.95 2.96 2.97 3.03 3.12 3.02 3.02 3.02 3.08 3.18

Capacity MBtuh Total Sens 34.60 34.60 35.39 32.59 36.06 26.34 39.16 27.52 43.20 22.16 36.24 36.24 36.44 36.11 36.90 28.24 40.00 29.50 44.00 23.33 37.59 37.59 37.64 37.64 37.53 30.01 40.64 31.35 44.60 24.44

Total Sys KW** 3.30 3.32 3.34 3.42 3.52 3.40 3.41 3.41 3.48 3.58 3.47 3.47 3.47 3.54 3.64

Capacity MBtuh Total Sens 32.45 32.45 32.82 31.18 33.40 25.10 36.41 26.33 40.37 21.10 34.01 34.01 34.06 34.06 34.16 26.96 37.18 28.29 41.11 22.27 35.28 35.28 35.33 35.33 34.76 28.74 37.75 30.14 41.64 23.37

Total Sys KW** 3.80 3.82 3.84 3.95 4.06 3.92 3.92 3.92 4.01 4.13 4.01 4.01 3.99 4.07 4.20

Capacity MBtuh Total Sens 30.07 30.07 30.12 30.12 30.40 23.73 33.45 25.06 37.44 20.00 31.54 31.54 31.59 31.59 31.10 25.56 34.18 27.02 38.09 21.17 32.78 32.78 32.82 32.82 31.66 27.29 34.73 28.86 38.57 22.27

Total Sys KW** 4.39 4.39 4.40 4.57 4.70 4.51 4.52 4.49 4.64 4.78 4.63 4.64 4.56 4.70 4.85

Capacity MBtuh Total Sens 27.19 27.19 27.24 27.24 26.65 22.06 29.97 23.59 34.27 18.84 28.67 28.67 28.72 28.72 27.35 23.86 30.76 25.56 34.91 20.01 29.92 29.92 29.97 29.97 27.97 25.57 31.38 27.42 35.35 21.11

Total Sys KW** 5.02 5.03 4.98 5.21 5.44 5.17 5.17 5.08 5.32 5.52 5.31 5.31 5.17 5.42 5.59

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 15

Performance Data 48 Size

Evaporator Air

75 (23.9)

85 (29.4)

Condenser Entering Air Temperatures °F (°C)

95 (35)

105 (40.6)

115 (46.1)

125 (51.7)

CFM 1400 1550 1800

EWB °F(°C)
57 (13.8)
62 (16.6)
63 (17.2)
67 (19.4)
72 (22.2)
57 (13.8)
62 (16.6)
63 (17.2)
67 (19.4)
72 (22.2)
57 (13.8)
62 (16.6)
63* (17.2)
67 (19.4)
72 (22.2)

Capacity MBtuh Total Sens 45.45 45.45 47.27 42.17 48.20 34.32 52.06 35.63 56.98 28.79 47.02 47.02 48.16 44.46 49.02 35.96 52.88 37.35 57.73 29.76 49.14 49.14 49.49 47.88 50.04 38.56 53.94 40.13 58.67 31.28

Total Sys KW** 3.10 3.13 3.13 3.15 3.18 3.17 3.17 3.18 3.20 3.23 3.25 3.25 3.25 3.28 3.31

Capacity MBtuh Total Sens 42.83 42.83 44.15 40.29 45.02 32.66 48.74 34.02 53.50 27.36 44.27 44.27 45.01 42.51 45.75 34.27 49.49 35.71 54.20 28.31 46.25 46.25 46.34 46.34 46.70 36.84 50.43 38.42 55.06 29.83

Total Sys KW** 3.46 3.49 3.50 3.52 3.56 3.54 3.55 3.55 3.57 3.61 3.63 3.63 3.63 3.65 3.69

Capacity MBtuh Total Sens 40.16 40.16 41.03 38.39 41.76 30.98 45.33 32.35 49.89 25.89 41.50 41.50 41.85 40.45 42.41 32.55 46.00 34.00 50.51 26.84 43.34 43.34 43.39 43.39 43.27 35.06 46.85 36.63 51.26 28.32

Total Sys KW** 3.89 3.91 3.92 3.95 3.99 3.96 3.97 3.98 4.00 4.04 4.06 4.06 4.06 4.08 4.12

Capacity MBtuh Total Sens 37.26 37.26 37.61 36.29 38.24 29.20 41.77 30.64 46.16 24.36 38.53 38.53 38.60 38.60 38.87 30.75 42.38 32.25 46.68 25.28 40.29 40.29 40.34 40.34 39.66 33.20 43.16 34.80 47.34 26.73

Total Sys KW** 4.36 4.36 4.38 4.44 4.48 4.44 4.44 4.45 4.49 4.53 4.55 4.55 4.54 4.57 4.62

Capacity MBtuh Total Sens 33.52 33.52 33.57 33.57 33.54 26.93 37.35 28.63 42.23 22.80 34.79 34.79 34.83 34.83 34.15 28.45 38.03 30.31 42.70 23.71 36.55 36.55 36.60 36.60 34.96 30.85 38.95 32.92 43.27 25.12

Total Sys KW** 4.82 4.83 4.82 4.96 5.04 4.92 4.92 4.89 5.04 5.09 5.07 5.07 5.00 5.12 5.18

Capacity MBtuh Total Sens 29.80 29.80 29.84 29.84 28.81 24.65 32.39 26.38 37.37 21.00 30.91 30.91 30.95 30.95 29.32 26.09 32.93 27.95 37.92 21.96 32.46 32.46 32.49 32.49 30.05 28.30 33.66 30.41 38.61 23.50

Total Sys KW** 5.37 5.37 5.33 5.46 5.64 5.46 5.46 5.40 5.53 5.70 5.60 5.61 5.51 5.65 5.78

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 16

Performance Data 60 Size

Evaporator Air

75 (23.9)

85 (29.4)

Condenser Entering Air Temperatures °F (°C)

95 (35)

105 (40.6)

115 (46.1)

125 (51.7)

CFM 1750 2000 2250

EWB °F(°C)
57 (13.8)
62 (16.6)
63 (17.2)
67 (19.4)
72 (22.2)
57 (13.8)
62 (16.6)
63 (17.2)
67 (19.4)
72 (22.2)
57 (13.8)
62 (16.6)
63* (17.2)
67 (19.4)
72 (22.2)

Capacity MBtuh Total Sens 57.04 57.04 58.59 49.98 59.69 40.44 64.43 42.04 70.39 33.58 59.44 59.44 60.04 53.50 60.84 43.04 65.61 44.79 71.45 35.11 61.37 61.37 61.42 61.42 61.75 45.60 66.46 47.42 72.23 36.56

Total Sys KW** 3.68 3.70 3.70 3.73 3.78 3.78 3.78 3.78 3.81 3.87 3.86 3.86 3.86 3.89 3.95

Capacity MBtuh Total Sens 53.71 53.71 54.72 48.26 55.67 38.90 60.26 40.56 66.06 32.25 55.93 55.93 56.07 56.07 56.74 41.49 61.36 43.29 67.02 33.78 57.76 57.76 57.83 57.83 57.57 43.99 62.10 45.93 67.73 35.23

Total Sys KW** 4.20 4.22 4.23 4.26 4.31 4.31 4.31 4.31 4.34 4.40 4.39 4.40 4.39 4.43 4.48

Capacity MBtuh Total Sens 50.37 50.37 50.83 46.41 51.62 37.32 56.00 39.00 61.55 30.87 52.41 52.41 52.48 52.48 52.56 39.87 56.95 41.68 62.40 32.37 54.09 54.09 54.15 54.15 53.29 42.29 57.67 44.25 63.02 33.84

Total Sys KW** 4.81 4.82 4.83 4.87 4.93 4.92 4.92 4.92 4.96 5.02 5.01 5.01 5.00 5.04 5.11

Capacity MBtuh Total Sens 46.94 46.94 47.02 47.02 47.50 35.70 51.67 37.39 56.94 29.39 48.83 48.83 48.90 48.90 48.32 38.18 52.51 40.02 57.67 30.89 50.36 50.36 50.42 50.42 48.99 40.55 53.13 42.53 58.17 32.33

Total Sys KW** 5.51 5.51 5.52 5.57 5.64 5.62 5.62 5.62 5.66 5.73 5.72 5.72 5.71 5.75 5.82

Capacity MBtuh Total Sens 42.94 42.94 43.00 43.00 42.48 33.69 47.05 35.71 52.21 27.88 44.92 44.92 44.98 44.98 43.48 36.25 47.83 38.30 52.81 29.36 46.38 46.38 46.44 46.44 44.27 38.64 48.44 40.74 53.23 30.78

Total Sys KW** 6.27 6.28 6.25 6.38 6.45 6.44 6.44 6.39 6.47 6.55 6.54 6.54 6.52 6.56 6.65

Capacity MBtuh Total Sens 38.22 38.22 38.29 38.29 36.58 31.27 41.05 33.47 47.19 26.29 39.97 39.97 40.04 40.04 37.36 33.66 41.86 36.09 47.75 27.77 41.44 41.44 41.51 41.51 38.08 35.80 42.58 38.56 48.12 29.19

Total Sys KW** 7.08 7.08 7.00 7.21 7.37 7.26 7.26 7.13 7.35 7.47 7.43 7.43 7.26 7.48 7.57

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 17

Performance Data

At 75F (24C) entering dry bulb-Tennessee Valley Authority (TVA) rating conditions; all others at 80F dry bulb. } Sensible capacities shown are based on 80F (27C) entering air at the indoor coil. For sensible capacities at other than 80F (27C), deduct 835 Btuh (245 kW) per 1000 CFM (480 L/S) of indoor coil air for each degree below 80F (27C), or add 835 Btuh (245 kW) per 1000 CFM (480 L/S) of indoor coil air per degree above 80F (27C). ** System KW is total of indoor and outdoor unit kilowatts. LEGEND BF– Bypass Factor edb– Entering Dry—Bulb Ewb– Entering Wet—Bulb kW — Total Unit Power Input SHC– Sensible Heat Capacity (1000 Btuh) TC — Total Capacity (1000 Btuh) (net) rh–Relative Humidity COOLING NOTES: 1. Ratings are net; they account for the effects of the evaporator —fan motor power and heat. 2. Direct interpolation is permissible. Do not extrapolate. 3. The following formulas may be used:
4. The SHC is based on 80_F (26.6_C) edb temperature of air enteringevaporator coil. Below 80_F (26.6_C) edb, subtract (corr factor x cfm) from SHC. Above 80_F (26.6_C) edb, add (corr factor x cfm) to SHC. Correction Factor = 1.10 x (1 + BF) x (edb — 80). 5. Integrated capacity is maximum (instantaneous) capacity less the effect of frost on the outdoor coil and the heat required to defrost it.

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 18

Gas Adjustment Natural Gas Orifice Sizes and Manifold Pressure – Single and Three Phase Models

Nameplate Input (Btu/hr)
45,000 60,000 89,000 *. Altitude of 2001ft and above is not allowed.

Orifice No. (Qty) Manifold Press. (in. W.C.)
Orifice No. (Qty) Manifold Press. (in. W.C.)
Orifice No. (Qty) Manifold Press. (in. W.C.)

Altitude of Installation (FT. Above Sea Level) U.S.A.*
0 to 2000 (0-610 m) 0.125-in.
3.2~3.8 28 (1) 3.2~3.8 18 (1) 3.2~3.8

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 19

Dry Coil Air Delivery* – Horizontal and Downflow Discharge Sizes 24-60

Unit Size

Heating Rise oF (oC)

Motor Speed

Tap

Allowable Functions

ESP (in. W.C.)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

CFM

640

553

454

310

—

Low

BHP

0.07

0.08

0.09

—

Blue

Alternate Heating

Gas Heat Rise (oF)

52

NA

Gas Heat Rise (oC)

29

NA

CFM

830

758

688

607

514

393

254

—

Med-Low

Pink

Heating

BHP

0.12

0.13

0.14

0.15

—

Alternate Cooling

Gas Heat Rise (oF)

40

44

49

55

NA

–NA

Gas Heat Rise (oC)

22

25

27

31

NA

24040

25 – 55 (14 – 31)

Medium**

Red

CFM

1080

1025

969

910

852

787

718

638

541

457

Cooling

BHP

0.21

0.22

0.23

0.24

0.25

0.26

0.27

Alternate Heating

Gas Heat Rise (oF)

31

33

35

37

39

43

47

52

NA

Gas Heat Rise (oC)

17

18

19

20

22

24

26

29

NA

CFM

1101

1046

993

936

878

816

749

676

599

498

Med-High

Orange

Alternate Cooling Alternate Heating

BHP

0.22

Gas Heat Rise (oF)

30

0.23 32

0.24 34

0.24 36

0.25 38

0.26 41

0.26 45

0.27 50

0.27 NA

0.28 NA

Gas Heat Rise (oC)

17

18

19

20

21

23

25

28

NA

High

Black High Static Cooling Only

CFM BHP

1222

1173

1123

1072

1021

967

912

853

787

712

0.29

0.30

0.31

0.32

0.33

0.34

CFM

640

553

454

310

—

Low

Blue

BHP

0.07

0.08

0.09

—

Gas Heat Rise (oF)

NA

Gas Heat Rise (oC)

NA

CFM

830

758

688

607

514

393

254

—

Med-Low

Pink

Alternate Cooling

BHP

0.12

0.13

0.14

0.15

—

Alternate Heating

Gas Heat Rise (oF)

54

NA

–NA

Gas Heat Rise (oC)

30

NA

24060

25 – 55 (14 – 31)

Medium**

Red

CFM

1080

1025

969

910

852

787

718

638

541

457

Cooling

BHP

0.21

0.22

0.23

0.24

0.25

0.26

0.27

Alternate Heating

Gas Heat Rise (oF)

41

44

46

49

52

NA

Gas Heat Rise (oC)

23

24

26

27

29

NA

CFM

1101

1046

993

936

878

816

749

676

599

498

Med-High Orange

Heating Alternate Cooling

BHP

0.22

Gas Heat Rise (oF)

41

0.23 43

0.24 45

0.24 48

0.25 51

0.26 55

0.26 NA

0.27 NA

0.28 NA

Gas Heat Rise (oC)

23

24

25

26

28

30

NA

High

Black High Static Cooling Only

CFM BHP

1222

1173

1123

1072

1021

967

912

853

787

712

0.29

0.30

0.31

0.32

0.33

0.34

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 20

Dry Coil Air Delivery* – Horizontal and Downflow Discharge Sizes 24-60

Unit Size

Heating Rise oF (oC)

Motor Speed

Tap

Allowable Functions

ESP (in. W.C.)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

CFM

643

552

455

348

225

—

Low

BHP

0.09

0.10

0.11

—

Blue

Alternate Heating

Gas Heat Rise (oF)

52

NA

Gas Heat Rise (oC)

29

NA

CFM

817

744

673

597

516

431

325

190

—

Med-Low

Pink

Heating

BHP

0.14

0.15

0.16

0.17

0.18

—

Alternate Cooling

Gas Heat Rise (oF)

41

45

50

NA

–NA

Gas Heat Rise (oC)

23

25

28

NA

30040

25 – 55 (14 – 31)

Medium

CFM

1159

1104

1045

990

937

878

821

759

693

618

Red

Alternate Cooling

BHP

0.31

0.32

0.33

0.34

0.35

0.36

0.37

0.38

Alternate Heating

Gas Heat Rise (oF)

29

30

32

34

36

38

41

44

48

54

Gas Heat Rise (oC)

16

17

18

19

20

21

23

25

27

30

CFM

1201

1147

1095

1037

987

934

877

818

755

671

Med-High** Orange

Cooling Alternate Heating

BHP

0.34

Gas Heat Rise (oF)

28

0.35 29

0.36 31

0.37 32

0.37 34

0.38 36

0.39 38

0.40 41

0.41 44

0.40 50

Gas Heat Rise (oC)

15

16

17

18

19

20

21

23

25

28

High

Black High Static Cooling Only

CFM BHP

1291

1236

1181

1131

1080

1033

978

909

792

661

0.41

0.42

0.43

0.44

0.45

0.46

0.45

0.43

0.40

CFM

643

552

455

348

225

—

Low

Blue

BHP

0.09

0.10

0.11

—

Gas Heat Rise (oF)

NA

Gas Heat Rise (oC)

NA

CFM

817

744

673

597

516

431

325

190

—

Med-Low

Pink

Alternate Cooling

BHP

0.14

0.15

0.16

0.17

0.18

—

Alternate Heating

Gas Heat Rise (oF)

55

NA

–NA

Gas Heat Rise (oC)

30

NA

30060

25 – 55 (14 – 31)

Medium

Red

CFM

1159

1104

1045

990

937

878

821

759

693

618

Heating

BHP

0.31

0.32

0.33

0.34

0.35

0.36

0.37

0.38

Alternate Cooling

Gas Heat Rise (oF)

39

40

43

45

48

51

54

NA

Gas Heat Rise (oC)

21

22

24

25

26

28

30

NA

CFM

1201

1147

1095

1037

987

934

877

818

755

671

Medium-High** Orange

Cooling Alternate Heating

BHP

0.34

Gas Heat Rise (oF)

37

0.35 39

0.36 41

0.37 43

0.37 45

0.38 48

0.39 51

0.40 55

0.41 NA

0.40 NA

Gas Heat Rise (oC)

21

22

23

24

25

27

28

30

NA

High

Black High Static Cooling Only

CFM BHP

1291

1236

1181

1131

1080

1033

978

909

792

661

0.41

0.42

0.43

0.44

0.45

0.46

0.45

0.43

0.40

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 21

Dry Coil Air Delivery* – Horizontal and Downflow Discharge Sizes 24-60

Unit Size

Heating Rise oF (oC)

36060

25 – 55 (14 – 31)

42060

25 – 55 (14 – 31)

Motor Speed Low
Med-Low Medium
Med-High High Low
Med-Low
Medium
Med-High High

Tap

Allowable Functions

Blue Pink Red Orange Black Blue Pink
Red
Orange Black

Alternate Cooling, Alternate Gas Heating
Gas Heating, Alternate Cooling
Alternate Cooling, Alternate Gas Heating
Cooling, Alternate Gas Heating High Static Cooling Only
Alternate Heating
Heating Alternate Cooling
Alternate Cooling Alternate Heating
Cooling Alternate Heating
High Static Cooling Only

CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC) CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC) CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC) CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC) CFM BHP CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC)
CFM
BHP Gas Heat Rise (oF) Gas Heat Rise (oC)
CFM
BHP Gas Heat Rise (oF) Gas Heat Rise (oC)
CFM
BHP Gas Heat Rise (oF) Gas Heat Rise (oC)
CFM BHP

0.1
1096 0.14 41 23 1151 0.16 39 22 1299 0.22 34 19 1382 0.26 32 18 1530 0.33 956 0.13 47 26
1201
0.21 37 21
1443
0.32 31 17
1529
0.37 29 16 1604 0.42

0.2
1044 0.15 43 24 1103 0.17 40 22 1252 0.23 36 20 1335 0.27 33 19 1485 0.35 899 0.13 50 28
1153
0.22 39 22
1402
0.33 32 18
1491
0.39 30 17 1565 0.44

0.3
994 0.16 45 25 1056 0.18 42 23 1204 0.24 37 21 1292 0.28 35 19 1442 0.36 843 0.14 53 29
1107
0.22 40 22
1361
0.34 33 18
1451
0.40 31 17 1529 0.45

ESP (in. W.C.)

0.4

0.5

945 0.18 47
26 1002 0.19
45
25 1155 0.25
39
21 1246 0.29
36
20 1398 0.37 786 0.15 NA
NA

892 0.19 50
28 953 0.20 47
26 1106 0.26
40
22 1202 0.30
37
21 1354 0.38 729 0.16 NA
NA

1060

1012

0.23

0.24

42

44

23

25

1322
0.35 34 19

1284
0.36 35 19

1411

1376

0.41 32
18 1490 0.46

0.42 32
18 1455 0.47

0.6
837 0.19 53 30 897 0.21 50 28 1059 0.27 42 23 1152 0.31 39 22 1309 0.39 676 0.16 NA NA
965
0.25 46 26
1243
0.37 36 20
1338
0.43 33 19 1421 0.48

0.7
780 0.20 NA NA 845 0.22 53 29 1007 0.28 44 25 1106 0.32 40 22 1263 0.40 621 0.17 NA NA
917
0.26 49 27
1204
0.38 37 21
1300
0.44 34 19 1385 0.49

0.8
717 0.21 NA NA 788 0.23 NA NA 959 0.29 47 26 1058 0.33 42 23 1217 0.41 558 0.18 NA NA
871
0.27 51 28
1164
0.39 38 21
1261
0.45 35 20 1348 0.50

0.9
664 0.22 NA NA 729 0.24 NA NA 905 0.30 49 27 1007 0.34 44 25 1169 0.42 504 0.18 NA NA
828
0.28 54 30
1124
0.40 40 22
1223
0.46 36 20 1310 0.51

1
612 0.23 NA NA 678 0.25 NA NA 844 0.31 53 29 957 0.35 47 26 1120 0.43 435 0.19 NA NA
782
0.29 NA NA
1084
0.42 41 23
1185
0.47 38 21 1274 0.52

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 22

Dry Coil Air Delivery* – Horizontal and Downflow Discharge Sizes 24-60

Unit Size

Heating Rise oF (oC)

42090

35 – 65 (19 – 36)

48090

35 – 65 (19 – 36)

Motor Speed Low
Med-Low Medium Med-High
High Low Med-Low Medium Med-High High

Tap

Allowable Functions

Blue Pink Red Orange Black Blue Pink Red Orange Black

Alternate Cooling Alternate Heating
Heating Alternate Cooling
Cooling Alternate Heating High Static Cooling Only
Heating Alternate Cooling
Cooling Alternate Heating
Alternate Cooling Alternate Heating High Static Cooling Only

CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC) CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC) CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC) CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC) CFM BHP CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC) CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC) CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC) CFM BHP Gas Heat Rise (oF) Gas Heat Rise (oC) CFM BHP

0.1
956 0.13 NA
NA 1201 0.21
56
31 1443 0.32
46
26 1529 0.37
44
24 1604 0.42 641 0.05 NA
NA 1437 0.29
47
26 1771 0.51
38
21 1928 0.64
35
19 2212 0.97

0.2
899 0.13 NA
NA 1153 0.22
58
32 1402 0.33
48
27 1491 0.39
45
25 1565 0.44 551 0.06 NA
NA 1395 0.30
48
27 1735 0.52
39
21 1897 0.65
35
20 2167 0.99

0.3
843 0.14 NA
NA 1107 0.22
60
34 1361 0.34
49
27 1451 0.40
46
26 1529 0.45 462 0.06 NA
NA 1351 0.31
50
28 1699 0.53
39
22 1862 0.67
36
20 2124 1.00

ESP (in. W.C.)

0.4

0.5

786 0.15 NA
NA 1060 0.23
63
35 1322 0.35
51
28 1411 0.41
47
26 1490 0.46 385 0.07 NA
NA 1307 0.32
51
28 1664 0.55
40
22 1830 0.68
37
20 2061 0.97

729 0.16 NA
NA 1012 0.24 NA
NA 1284 0.36
52
29 1376 0.42
49
27 1455 0.47 289 0.07 NA
NA 1265 0.33
53
29 1627 0.56
41
23 1796 0.69
37
21 1976 0.95

0.6
676 0.16 NA
NA 965 0.25 NA
NA 1243 0.37
54
30 1338 0.43
50
28 1421 0.48 216 0.08 NA
NA 1221 0.34
55
30 1592 0.57
42
23 1764 0.71
38
21 1892 0.91

0.7
621 0.17 NA
NA 917 0.26 NA
NA 1204 0.38
56
31 1300 0.44
52
29 1385 0.49 163 0.08 NA
NA 1176 0.35
57
32 1557 0.58
43
24 1732 0.72
39
21 1794 0.86

0.8
558 0.18 NA
NA 871 0.27 NA
NA 1164 0.39
58
32 1261 0.45
53
29 1348 0.50 115 0.09 NA
NA 1132 0.36
59
33 1522 0.59
44
24 1698 0.73
39
22 1699 0.82

0.9
504 0.18 NA
NA 828 0.28 NA
NA 1124 0.40
60
33 1223 0.46
55
30 1310 0.51
—-NA
NA 1084 0.37
62
34 1486 0.61
45
25 1620 0.71
41
23 1567 0.77

1
435 0.19 NA
NA 782 0.29 NA
NA 1084 0.42
62
34 1185 0.47
57
31 1274 0.52
—-NA
NA 1039 0.38
64
36 1450 0.62
46
26 1512 0.66
44
25 1438 0.71

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 23

Dry Coil Air Delivery* – Horizontal and Downflow Discharge Sizes 24-60

Unit Size
60090

Heating Rise Motor Speed Tap oF (oC)

Allowable Functions

CFM

Low

Blue

Alternate Heating

BHP Gas Heat Rise (oF)

Gas Heat Rise (oC)

CFM

Med-Low

Pink

Heating Alternate Cooling

BHP Gas Heat Rise (oF)

Gas Heat Rise (oC)

35 – 65

CFM

(19 – 36)

Medium**

Red

Cooling Alternate Heating

BHP Gas Heat Rise (oF)

Gas Heat Rise (oC)

CFM

Med-High

Orange

Alternate Cooling Alternate Heating

BHP Gas Heat Rise (oF)

Gas Heat Rise (oC)

High

Black High Static Cooling Only

CFM BHP

Shaded areas indicate speed/static combinations that are not permitted for dehumidification speed.

0.1
641 0.05 NA
NA 1437 0.29
47
26 1914 0.62
35
19 1928 0.64
35
19 2212 0.97

Air delivery values are without air filter and are for dry coil (See Wet Coil Pressure Drop Table). Factory-shipped continuous fan speed Factory-shipped heating speed ** Factory-shipped cooling speed “High Static Cooling” = Only to be used for cooling function (not allowed for heating function) NOTE: Deduct field-supplied air filter pressure drop and wet coil pressure drop to obtain static pressure available for ducting.

Wet Coil Pressure Drop (IN. W.C.)

0.2
551 0.06 NA
NA 1395 0.30
48
27 1881 0.64
36
20 1897 0.65
35
20 2167 0.99

0.3
462 0.06 NA
NA 1351 0.31
50
28 1848 0.65
36
20 1862 0.67
36
20 2124 1.00

Unit Size 24 30 36 42 48 60

Standard CFM (SCFM)

600

700

800

900

1000

1100

1200

1300

1400

1500

0.03

0.04

0.05

0.06

0.05

0.06

0.07

0.08

0.11

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.04

0.05

0.06

ESP (in. W.C.)

0.4

0.5

385 0.07 NA
NA 1307 0.32
51
28 1814 0.67
37
21 1830 0.68
37
20 2061 0.97

289 0.07 NA
NA 1265 0.33
53
29 1780 0.68
38
21 1796 0.69
37
21 1976 0.95

1600

1700

0.09

0.07

0.01

0.6 216 0.08 NA NA 1221 0.34 55 30 1748 0.69 38 21 1764 0.71 38 21 1892 0.91
1800
0.11 0.08 0.08

Economizer with 1-in. Filter Pressure Drop (IN. W.C.)

Filter Size in. (mm)
600-1400 CFM 12x20x1+12x20x1 (305x508x25+305x508x25)
1200-1800CFM 16x24x1+14x24x1 (406x610x25+356x610x25)
1500-2200CFM 16x24x1+18x24x1 (406x610x25+457x610x25)

Cooling Tons 2.0, 2.5
3.5
3.0, 4.0, 5.0

Standard CFM (SCFM) 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700

–

0.08 0.09 0.10 0.11 0.11 0.13 0.14

–

0.09 0.09 0.10 0.12 0.13 0.15 0.17

–

0.15 0.17 0.18

0.7
163 0.08 NA
NA 1176 0.35
57
32 1716 0.71
39
22 1732 0.72
39
21 1794 0.86

0.8
115 0.09 NA
NA 1132 0.36
59
33 1681 0.72
40
22 1698 0.73
39
22 1699 0.82

0.9
—-NA
NA 1084 0.37
62
34 1619 0.71
41
23 1620 0.71
41
23 1567 0.77

1
—-NA
NA 1039 0.38
64
36 1512 0.66
44
25 1512 0.66
44
25 1438 0.71

1900

2000

2100

2200

0.09

0.14

0.09

0.10

0.12

0.13

1800 1900 2000 2100 2200

–

0.17 0.19 0.21

–

0.20 0.21 0.22 0.23 0.23

577C–K Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 24

Filter Pressure Drop Table (IN. W.C.)

Filter Size in. (mm)
600-1400CFM 12x20x1+12x20x1 (305x508x25+305x508x25
1200-1800 CFM 16x24x1+14x24x1 (406x610x25+356x610x25)
1100-2200 CFM 16x24x1+18x24x1 (406x610x25+457x610x25)

Cooling Tons 2.0, 2.5
3.5
3.0 4.0 5.0

Standard CFM (SCFM) 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200

0.03 0.05 0.06 0.08 0.10 0.11 0.13 0.14 0.16

–

0.07 0.08 0.09 0.09 0.10 0.11 0.12

–

0.02 0.02 0.03 0.03 0.04 0.06 0.08 0.10 0.11 0.13 0.14 0.15

577C–K Ultra Low NOx: Product Data
Typical Piping and Wiring
ROOF-MOUNTING CURB
SUPPLY-AIR FLEXIBLE DUCT

ROOF
RETURN-AIR FLEXIBLE DUCT

CONCENTRIC DIFFUSER BOX (FIELD-SUPPLIED)

CEILING

RETURN AIR
TOP COVER

INDOOR THERMOSTAT
FROM POWER SOURCE

A09230

Application Data
Condensate trap — A 2-in. (50.8 mm) condensate trap must be field supplied.
Ductwork — Secure downflow discharge ductwork to roof curb. For horizontal discharge applications, attach ductwork to unit with flanges.
To convert a unit to downflow discharge — Units are equipped with factory- installed inserts in the down-flow openings. Removal of the inserts is similar to removing an electrical knock-out. Use the duct cover to seal the horizontal discharge openings in the unit. Units installed in horizontal discharge orientation do not require duct covers.
Airflow — Units are draw-thru in the cooling mode and blow-thru in the heating mode.

FROM GAS LINE

DISCONNECT PER NEC*

*NEC – NATIONAL ELECTRICAL CODE

A09231

Maximum cooling airflow — To minimize the possibility of condensate blow-off from the evaporator, airflow through the units should not exceed 450 CFM per ton.
Minimum cooling airflow — Minimum cooling airflow is 350 cfm per ton.
Minimum ambient cooling operation temperature — All standard units have a minimum ambient operating temperature of 40_F (4_C). With accessory low ambient temperature kit, units can operate at temperatures down to 0_F (-17_C).
Minimum temperature — Air entering the heat exchanger in heating mode must be a minimum of 50_F (10_C) continuous and/or 45_F (7_C) intermittent.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 25

577C–K Ultra Low NOx: Product Data

Electrical Data

MODEL

NOMINAL V-PH-HZ

VOLTAGE RANGE

MIN

MAX

COMPRESSOR

RLA

LRA

OFM FLA

IFM FLA

IDM FLA

POWER SUPPLY

MCA

MOCP

24040, 24060

208/230-1-60

197

253

11.1

59.5

0.6

3.9

0.7

18.4

25

30040, 30060

208/230-1-60

197

253

14.1

67.9

1.05

3.9

0.7

22.6

30

36060 208/230-1-60

197

253

14.7

75

1.05

3.8

0.7

23.3

35

36060 208/230-3-60

197

253

8.5

70

1.05

3.8

0.7

15.5

25

42060, 42090

208/230-1-60

197

253

16.7

109

1.05

5.8

0.7

27.8

40

42060, 42090

208/230-3-60

197

253

11.2

84

1.05

5.8

0.7

20.9

30

48090 208/230-1-60

197

253

19.6

130

1.05

6.9

0.7

32.5

50

48090 208/230-3-60

197

253

13.7

83.1

1.05

6.9

0.7

25.1

35

LEGEND
FLA – Full Load Amps IDM – Inducer Motor IFM – Indoor Fan Motor LRA -Locked Rotor Amps MCA – Minimum Circuit Amps MOCP – Maximum Over Current Protection OFM – Outdoor Fan Motor RLA – Rated Load Amps

A06564

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 26

577C–K Ultra Low NOx: Product Data
Connection Wiring Schematic 208/230-1-60

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 27

A221593

577C–K Ultra Low NOx: Product Data
Ladder Wiring Schematic 208/230-1-60
A221594 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
28

577C–K Ultra Low NOx: Product Data
Connection Wiring Schematic 208/230-3-60
A221591 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
29

577C–K Ultra Low NOx: Product Data
Ladder Wiring Schematic 208/230-3-60
A221592 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
30

577C–K Ultra Low NOx: Product Data
Controls
Operating Sequence
Heating Sequence of Operation (Ultra Low NOx Single and Three Phase Models)
On a call for heating, terminal W of the thermostat is energized, starting the induced-draft motor for a 30 second pre-purge at intermediate speed. When the pressure switch senses that the induced-draft motor is moving sufficient combustion air, the burner sequence begins. This function is controlled by the integrated gas unit controller (IGC).
After 30 sec of pre-purge is complete, the pressure switch checks for sufficient combustion. Then, the gas valve energizes and the system attempts to ignite with igniter being energized. The igniter energizes for 5 sec and integrated gas controller (IGC) allows system to sense flame for 2 sec at the end of 5 sec of ignition trial. On first successful ignition, system stays at the intermediate inducer speed for 10 sec and gradually ramps up to the high speed for steady-state operation. The system uses the same logic for 2nd ignition trial. If a 3rd or 4th ignition attempt is needed, the inducer speed is decreased to the low speed. On a successful light on the 3rd or 4th attempt, the inducer speed is increased to the intermediate speed for about 10 seconds and then gradually ramps up to the high speed for steady-state operation. In case the 4th attempt fails, the system will lock out for 1 hr. After 1 hr. lock out period, the system starts with normal operating sequence. Once flame is established and proven successfully, indoor (evaporator) fan motor is energized after 30 seconds. When the thermostat is satisfied and W is de-energized, the pre-mix burner will stop firing and the indoor (evaporator) fan motor shuts off after a 90 second time-off delay. Please note that the IGC has the capability to automatically decrease the indoor (evaporator) fan motor “ON” delay and increase the indoor (evaporator) fan motor “OFF” delay in the event of high duct static and/or partially-clogged filter.

Cooling Sequence of Operation
With the room thermostat SYSTEM switch in the COOL position and the FAN switch in the AUTO position, the cooling sequence of operation is as follows:
1. When the room temperature rises to a point that is slightly above the cooling control setting of the thermostat, the thermostat completes the circuit between thermostat terminal R to terminals Y and G.
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).
NOTE: Once the compressor has started and then stopped, it should not be started again until 5 minutes have elapsed. The cooling cycle remains on until the room temperature drops to a point that is slightly below the cooling control setting of the room thermostat. At this point, the thermostat breaks the circuit between thermostat terminal R to terminals Y and G. These open circuits deenergize contactor coil C. The condenser and compressor motors stop. After a 60-sec. delay, the blower motor stops. The unit is in a standby condition, waiting for the next call for cooling from the room thermostat.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 31

577C–K Ultra Low NOx: Product Data
Guide Specifications Packaged Gas Heating/Electric Cooling Units Constant Volume Application HVAC Guide Specifications
Size Range:2 to 5 Tons, Nominal Cooling
60,000 to 90,000 Btuh,
Nominal Heating Input
General
SYSTEM DESCRIPTION
Outdoor rooftop mounted, gas heating/electric cooling unit utilizing a hermetic scroll compressor for cooling duty. Unit shall discharge supply air vertically or horizontally as shown on contract drawings. Condenser fan/coil section shall have a draw-thru design with vertical discharge for minimum sound levels.
QUALITY ASSURANCE Unit shall be rated in accordance with AHRI Standards 210/240 and 270-1995. Unit shall be designed in accordance with UL Standard 1995 and ANSI Z 21.47. Unit shall be manufactured in a facility registered to ISO 9001 manufacturing quality standard. Unit shall be UL listed and c-UL certified as a total package for safety requirements. Roof curb shall be designed to conform to NRCA Standards. Insulation and adhesives shall meet NFPA 90.1 requirements for flame spread and smoke generation. Cabinet insulation shall meet ASHRAE Standard 62.2.
DELIVERY, STORAGE AND HANDLING Unit shall be stored and handled per manufacturer’s recommendations.
Products
EQUIPMENT
General:
Factory-assembled, single-piece, heating and cooling unit. Contained within the enclosure shall be all factory wiring, piping, controls, refrigerant charge with R-410A refrigerant, and special features required prior to field start-up.
Unit Cabinet: Unit cabinet shall be constructed of phosphated, zinc-coated, pre-painted steel capable of with-standing 500 hours in salt spray. Normal service shall be through 3 removable cabinet panels. The unit shall be constructed on a rust proof unit base that has an externally trapped, integrated sloped drain. Evaporator fan compartment top surface shall be insulated with a minimum 1/2-in. (12.7 mm) thick, flexible fiberglass insulation, coated on the air side and retained by adhesive and mechanical means. The evaporator wall sections will be insulated with a minimum semi- rigid foil-faced board capable of being wiped clean. Aluminum foil-faced fiberglass insulation shall be used in the entire indoor air cavity section. Unit shall have a field-supplied condensate trap.
Fans: The evaporator fan shall be a multi-speed, direct-drive, as shown on equipment drawings. Fan wheel shall be made from steel, be double-inlet type with forward curved blades with corrosion resistant finish. Fan wheel shall be dynamically balanced. Condenser fan shall be direct drive propeller type with aluminum blades riveted to corrosion resistant steel spiders, be dynamically balanced, and discharge air vertically.

Compressor: Fully hermetic compressors with factory-installed vibration isolation.
Coils:
Evaporator and condenser coils shall have aluminum plate fins mechanically bonded to seamless copper tubes with all joints brazed. Tube sheet openings shall be belled to prevent tube wear.
Heating Section: Induced-draft combustion type with energy saving direct spark ignition system and redundant main gas valve. Induced-draft motors shall provide adequate airflow for combustion. The heat exchangers shall be constructed of stainless steel for corrosion resistance. Pre-mixed burners shall be stainless steel and other alloys. All gas piping and electric power shall enter the unit cabinet at a single location.
Refrigerant Components:
Refrigerant expansion device shall be of the TXV (thermostatic expansion valve) or fixed orifice type.
Filters:
Filter section shall consist of field-installed, throwaway, 1-in. (25 mm) thick fiberglass filters of commercially available sizes.
Controls and Safeties: Unit controls shall be complete with a self-contained low voltage control circuit. Compressors shall incorporate a solid-state compressor protector that provides reset capability.
Operating Characteristics: Unit shall be capable of starting and running at 125_F (51_C) ambient outdoor temperature per maximum load criteria of AHRI Standard 210. Compressor with standard controls shall be capable of operation down to 40_F (4_C) ambient outdoor temperature. Units shall be provided with fan time delay to prevent cold air delivery before the heat exchanger warms up. Unit shall be provided with 60-second fan time delay (single phase models) after the thermostat is satisfied.
Electrical Requirements:
All unit power wiring shall enter the unit cabinet at a single location.
Motors: Compressor motors shall be of the refrigerant-cooled type with line- break thermal and current overload protection. All fan motors shall have permanently lubricated bearings, and inherent, automatic reset, thermal overload protection. Condenser fan motor shall be totally enclosed. Evaporator Fan Motor to be ECM Motor.
Compressor Protection:
Solid-state control shall protect compressor by preventing “short cycling.”

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 32

577C–K Ultra Low NOx: Product Data
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.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 33

577C–K Ultra Low NOx: Product Data

Edition Date: 12/22

Catalog No: PDS577C-ULN-08 Replaces: PDS577C-ULN-07

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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