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

IS INDUCER RUNNING

ON LOW SPEED?

YES

DOES THE HOT

SURFACE IGNITOR

ENERGIZE AND GLOW?

YES

NO

NO

CHECK CONTACTS ON LOW FIRE PRESSURE SWITCH AND FOR BLOCKAGE IN FLUE. IF OK, REPLACE DUAL PRESSURE SWITCH.

IS THERE VOLTAGE ACROSS

HOT SURFACE IGNITOR

TERMINALS "IGN" & "IGN N" AT THE 50V61-143 CONTROL AFTER 25 SECOND PREPURGE?

YES

CHECK WIRING TO HOT

SURFACE IGNITOR AND

IF OK, REPLACE HOT

SURFACE IGNITOR

ASSEMBLY

 

REPLACE THE

 

50V61-143 CONTROL.

 

 

 

 

 

YES

 

 

 

 

IS THE HIGH LIMIT,

NO

ROLL-OUT LIMIT, AND

AUX LIMIT ON

 

 

(CDX MODELS)

 

SWITCHES CLOSED?

NO

IF HIGH LIMIT OR

AUX LIMIT OPEN CHECK

FOR RESTRICTED

FILTERS OR DUCT WORK IF ROLL-OUT SWITCH OPEN INSPECT FLUE FOR RESTRICTIONS.

AFTER HOT SURFACE IGNITOR WARM-UP, DOES GAS VALVE OPEN?

YES

AFTER GAS VALVE

OPENS, DO THE

BURNERS IGNITE?

NO

NO

 

CHECK ACROSS "MVL" AND

 

 

"MV COM" TERMINALS ON

 

 

50V61-143 CONTROL FOR 24

NO

 

VOLTS DURING THE 4 SECOND

 

 

 

FLAME PROVING PERIOD

 

 

AFTER IGNITOR WARM-UP.

 

 

IS THERE 24 VOLTS?

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

IS COLLECTOR BOX

NO

PRESSURE SWITCH CLOSED?

YES

CHECK WIRING TO GAS

VALVE AND IF OK,

REPLACE GAS VALVE.

CHECK FOR PROPER LINE

AND MANIFOLD PRESSURE.

REFERENCE GAS PRESSURE

CHART PAGE 31.

REPLACE THE

50V61-143 CONTROL.

CHECK DRAIN FOR BLOCKAGE WATER TRAPPED IN HOSE, REPLACE SWITCH.

YES

OK

44

Page 49 Page 51
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Thermo Products CHX1-75N, CDX1-75N, CHX1-125N, CHX1-100N, CDX1-125N, CDX1-100N operation manual Is the High Limit
Page 49 Page 51

CDX1-100N, CDX1-125N, CHX1-100N, CHX1-75N, CHX1-125N specifications

Thermo Products has established itself as a leader in the HVAC industry, providing innovative solutions for climate control with their latest product line, including the CHX1-125N, CDX1-75N, CDX1-100N, CHX1-75N, and CHX1-100N models. These units are designed for both efficiency and performance, catering to a wide range of heating and cooling needs.

One of the standout features of these models is their high energy efficiency ratings. Utilizing advanced inverter technology, these units dynamically adjust their operating frequency, optimizing energy consumption while maintaining consistent temperature control. This adaptability not only enhances comfort but also significantly lowers energy bills, making them an eco-friendly choice for both residential and commercial applications.

The CHX1 series, including the CHX1-125N, CHX1-75N, and CHX1-100N, is renowned for its robust build quality and superior performance in extreme conditions. They can operate effectively in varied environments, ensuring reliable heating during harsh winters and efficient cooling amid hot summers.

In contrast, the CDX1 series—featuring the CDX1-75N and CDX1-100N—focuses on delivering exceptional versatility. These models come equipped with advanced multi-zone capabilities, allowing users to control different areas or rooms with precision. This zoning capability not only enhances comfort but also optimizes energy efficiency by allowing users to heat or cool only the spaces that are occupied.

A common characteristic among all these models is their quiet operation. Designed with noise-reduction technologies, the units are engineered to operate with minimal sound, making them ideal for residential settings, offices, and other noise-sensitive environments.

Moreover, Thermo Products emphasizes user-friendly interfaces in their design. With intuitive controls and smart connectivity options, users can easily manage their HVAC systems through mobile applications, ensuring convenience and optimal temperature management from anywhere.

Overall, Thermo Products’ CHX1-125N, CDX1-75N, CDX1-100N, CHX1-75N, and CHX1-100N models exemplify the perfect blend of innovation, efficiency, and user-centered design. These heating and cooling solutions not only meet the demands of modern living but also contribute to sustainability efforts, making them a valuable addition to any climate control system.
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