Thermo Products CHX3-75N, CDX3-75N, CHX3-125N, CDX3-125N II. FURNACE SPECIFICATIONS CHX3 SERIES

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

II. FURNACE SPECIFICATIONS

CHX3 SERIES

MODEL NO.

CHX3-75

CHX3-100

CHX3-125

BTU/HR INPUT (High fire/ Low fire)

75,000 / 52,000

100,000 / 70,000

125,000 / 87,500

BTU/HR OUTPUT (High fire/ Low fire)

71,000 / 49,000

95,000 / 66,000

115,000 / 82,000

 

 

 

 

HEIGHT OF CASING

44-1/4”

44-1/4”

44-1/4”

WIDTH OF CASING

17”

21”

24”

DEPTH OF CASING

27-1/2”

27-1/2”

27-1/2”

WARM AIR OUTLET

15 x 18

19 x 18

22 x 18

RETURN AIR INLET

25 x 16

25 x 16

25 x 16

 

 

 

 

DIA. OF FLUE

2”

3”

3”

DIA. OF COMBUSTION

2”

3”

3”

AIR INTAKE

 

 

 

 

 

 

 

CFM from .2” & .5” w.c.

COOLING

COOLING

COOLING

EXTERNAL STATIC PRESSURE

 

 

 

@COOLING TAP A

1000

1200

1400

@COOLING TAP B

800

1000

1200

@COOLING TAP C

1200

1400

1600

@COOLING TAP D

1400

1600

2000

 

 

 

 

 

HEATING

HEATING

HEATING

@HEATING TAP A (High fire/Low fire)

931 / 760

1243 / 1015

1556 / 1270

 

 

 

 

TEMPERATURE RISE

70 / 60

70 / 60

70 / 60

BLOWER MOTOR HP

.5

.75

1

 

 

 

 

POWER CHOKES

-

2.65 Mh

2.1 Mh

LARGEST RECOMMEDED

3.5 Ton

4 Ton

5 Ton

AIR CONDITIONER

 

 

 

SIZE OF FILTERS

24-3/4” x 15-3/4”

24-3/4” x 15-3/4”

24-3/4” x 19-3/4”

NOTES:

 

 

 

1.BTU output based on annual fuel utilization efficiency rated by manufacturer.

2.On all outlet and inlet dimensions, the first dimension is width.

3.To permit largest recommended air conditioning (at .5 static pressure), selection of the highest motor speed is required.

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Contents OR LP GAS PROPANE CDX3-75N CDX3-100N CDX3-125N MODELSTWO 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 SECTION INDEXBEGINNING 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 Piping Arrangement for the Figure 9 Typical Internal VentFurnace 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