Thermo Products CDX3-125N, CDX3-75N, CHX3-75N, CHX3-125N, CHX3-100N Converting Gas Flow Rate

Page 51
TABLE 6 - CONVERTING GAS FLOW RATE

All installations and services must be performed by qualified service personnel.

 

 

 

 

 

 

 

 

TIME (sec.)

FLOW (cfh)

 

TABLE 6 - CONVERTING GAS FLOW RATE

 

 

 

 

 

 

 

 

 

 

 

40

90

*

For one cubic foot per revolution gas meter dials,

 

 

 

 

 

 

 

41

88

 

 

 

 

 

 

 

42

86

 

 

use Table directly.

 

 

 

 

 

44

82

*

For 1/2 cubic foot per revolution gas meter dials:

 

 

 

 

 

45

80

 

 

 

 

 

46

78

 

 

1.

Determine time for two dial revolutions

 

 

 

 

47

77

 

 

2.

Use Table directly

 

 

 

48

75

*

For two cubic foot per revolution gas meter dials:

 

 

49

73

 

50

72

 

 

1.

Determine time for one complete dial revolutions

 

51

71

 

 

2.

Divide time by two

 

52

69

 

 

3.

Use Table directly

 

53

68

 

 

 

 

54

67

 

 

 

 

55

65

 

 

 

 

 

56

64

 

 

 

 

 

57

63

 

 

 

 

 

58

62

 

 

 

 

 

59

61

 

 

 

 

 

60

60

 

 

 

 

 

62

58

 

 

 

 

 

64

56

 

 

 

 

 

66

54

 

 

 

 

 

68

53

 

 

 

 

 

70

51

 

 

 

 

 

72

50

 

 

 

 

 

74

49

 

 

 

 

76

47

 

 

 

 

78

46

 

 

 

 

80

45

 

 

 

 

 

84

43

 

 

 

 

 

88

41

 

 

 

 

 

92

39

 

 

 

 

 

96

38

 

 

 

 

 

100

36

 

 

 

 

 

105

34

 

 

 

 

 

110

33

 

 

 

 

 

115

31

 

 

 

 

 

120

30

 

 

 

 

 

125

29

 

 

 

 

 

130

28

 

 

 

 

 

135

27

 

 

 

 

140

26

 

 

 

 

150

24

 

 

 

 

 

160

23

 

 

 

 

 

170

21

 

 

 

 

 

180

20

 

 

 

 

45

Image 51
Contents MODELS OR LP GAS PROPANE CDX3-75N CDX3-100N CDX3-125NTWO STAGE CONDENSING GAS FURNACE I. SAFETY INFORMATION This and the previous page contain reproductions of the various warning and instruction labels placed on the Thermo Pride Two Stage Condensing Gas Furnaces. Please read and comply with the contents of these labels 1.A windows be opened The CHX3/CDX3 furnace models are sealed combustion design, which does not require an air shutter adjustment air shutters are not used for proper flame characteristics. Burner box access cover must always be secured with all screws in place and tightened before operating furnace INDEX SECTIONBEGINNING PAGE II. FURNACE SPECIFICATIONS CHX3 SERIES CDX3 SERIES INSTALLATION PARTS PACKAGES - CHX3-75 INSTALLATION PARTS PACKAGES - CDX3-75 Grounding instructions III. GENERAL INSTALLATION B1. CDX3 HORIZONTAL APPLICATION B. FURNACE LOCATIONPage PVC Pipe Designation Maximum Quantity of Elbows Outside Combustion Air Intake RH view E.Direct Venting Through a Sidewallc.The vent terminal shall not be located Page E1. Single-PipeSidewall Venting Option 5.Optional Direct Vent Terminations Install these optional kits according to the instructions provided with each kit. The location and clearance requirements are identical to those of the standard vent terminations described in this manual 1.Figures 6B, 7, and 8 follow depicting typical exhaust vent and air intake connections for the furnace model series CHX3 and the CDX3, respectively, as well as a list of required parts to correctly install each system Page Applications Figure 9 Typical Internal Vent Piping Arrangement for theFurnace Model Series CHX3 3. Connecting The Combustion Air Intake Piping Figure 14. TRAP ASSEMBLY MOUNTED ON CHX3 I.CONDENSATE DRAIN LINE AND TRAP ASSEMBLYFigure 15. TRAP ASSEMBLY MOUNTED ON CDX3 2.Determine on which side of furnace the condensate disposal line is to be run NOTICE On CHX3/CDX3’s this must be the same side as the flue outlet or bottom of unit. Attach the condensate trap to the furnace casing using the #8x3/4” sheet metal screws provided in the parts package. Pilot holes are provided on both sides of the casing for mounting J. GENERAL GAS PIPING J1. REQUIREMENTS AND SIZING OF DUCT WORK Figure 18A TABLE 2A 2. CDX3 MODELS COUNTERFLOWS K. FILTERS 1. CHX3 MODELS HIGHBOYSPage L. WIRING Table 4A Time S7 DIP SwitchSwitch Settings Options2-StageBlower Settings from factory Table 4C IV. STARTING THE UNIT A. SEQUENCE OF OPERATIONS IF NOT IF THERMOSTAT W2 CONTACTS ARE CLOSED OTHERWISE OPERATING INSTRUCTIONS B. INITIAL START UPB.Gas flowrate by clocking gas meter C. Measuring And Adjusting Heat Input RateObserve the following precautions when measuring A.Burner manifold pressure with a pressure gaugeNOTICE A U-tubemanometer, measuring pressure in inches of water column, is recommended for all gas pressure measurements. However, an aneroid pressure gauge, in good working condition, capable of reading pressure changes of 0.05 in. W.G., or less, that was recently calibrated within the last year, is a satisfactory alternate. These two 2 devices will be considered as equivalent and interchangeable. Either device is referred to below as a “pressure gauge” Heat input rate in BTUH = Page Checking The Burner Flame 21.Go to Checkout Procedure belowCheckout Procedure TABLE 6 - CONVERTING GAS FLOW RATE V. INSTALLERS INSTRUCTIONS TO USER D. FURNACE CHECKOUT PROCEDUREFigure VI. TROUBLESHOOTING Power must be disconnected before servicing DIAGNOSTIC FEATURESTROUBLESHOOTING GUIDE IS INDUCER RUNNING ON LOW SPEED? YES DOES THE HOT DO BURNERS STAY LIT PAST PROOF OF FLAME CHECK? REPLACE THE 50V51-843CONTROL DOESBURNERSHUT OFF Appendix -AReplacement Parts List Page Page Page Appendix - B Wiring Diagrams