SEQUENCE OF OPERATIONS

APPLY POWER TO

APPLIANCE

Intelli-Vent™

Sequence of Operation

 

NO

DISPLAY ERROR CODE

 

 

 

 

 

IS FIELD WIRING

 

 

 

 

 

 

CORRECT?

 

 

1 OR

2

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

REQUEST

NO

 

 

 

 

 

 

 

 

FOR HEAT

 

 

 

 

 

 

 

 

 

PRESENT?

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

IS

NO

WAIT FOR PRESSURE

IS

NO

WAIT FOR PRESSURE

 

 

PRESSURE SWITCH

SWITCH TO OPEN

PRESSURE SWITCH

SWITCH TO OPEN

 

 

PROVEN OPEN WITHIN

 

DISPLAY ERROR

PROVEN OPEN WITHIN

 

DISPLAY ERROR

 

 

5 SECONDS?

 

NUMBER

3

5 SECONDS?

 

NUMBER

3

 

 

YES

 

 

 

YES

 

 

 

 

 

COMBUSTION

 

 

 

COMBUSTION

 

 

 

 

 

BLOWER ON

 

 

 

 

 

 

 

 

 

 

 

BLOWER ON

 

 

 

ONE HOUR AUTO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOCKOUT RESET

 

 

 

 

 

 

 

 

 

DELAY

 

IS

NO

WAIT FOR PRESSURE

IS

NO

WAIT FOR PRESSURE

 

 

PRESSURE SWITCH

PRESSURE SWITCH

 

 

SWITCH TO CLOSE

SWITCH TO CLOSE

 

 

PROVEN CLOSED

 

PROVEN CLOSED

 

 

 

 

DISPLAY ERROR

 

DISPLAY ERROR

 

 

WITHIN 5

 

WITHIN 5

 

 

 

 

NUMBER

4

 

NUMBER

4

 

 

SECONDS?

 

SECONDS?

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PREPURGE

 

 

 

 

 

 

 

 

 

IS

NO

TURN OFF INDUCER

 

 

 

 

 

 

IGNITOR

 

DISPLAY ERROR CODE

 

 

 

 

 

 

OKAY?

 

NUMBER

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TURN OFF INDUCER

 

YES

 

 

 

 

 

 

COMBUSTION

AFTER POST-PURGE

6

 

 

 

 

 

 

DISPLAY ERROR

 

 

 

 

 

 

 

BLOWER OFF

IGNITOR ON FOR

 

 

 

 

WARM-UP TIME

 

 

 

 

MAIN VALVE OPENS

 

 

 

 

YES

 

 

 

INTERPURGE

 

 

 

 

MAIN

 

 

 

 

BURNER LIGHTS

NO

LESS

 

YES

AND IS SENSED

 

MAIN VALVE CLOSES

THAN 3 TRIES

 

DURING TRIAL

 

FOR

 

FOR IGNITION?

 

 

IGNITION

 

 

 

 

YES

 

NO

 

 

IGNITOR TURNS OFF

 

 

 

 

IS

YES

LOST

3

YES

FLAME SENSE

MAIN VALVE CLOSES

LESS THAN

 

LOST?

 

TIMES?

 

 

NO

 

NO

 

 

NO IS REQUEST FOR HEAT

SATISFIED?

YES

MAIN VALVE OFF

COMBUSTION

BLOWER OFF AFTER

POST-PURGE DELAY

Please Note:

The control continually monitors internal circuits and external sensors. Error codes noted above, and those for self-diagnostic faults can be found on pages 8 and 9.

7

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White Rodgers 37E73A-918, 927, 922, 921 installation instructions Sequence of Operations, Intelli-Vent Sequence of Operation

922, 921, 37E73A-918, 927 specifications

The White Rodgers 37E73A series is a highly regarded line of thermostats known for their reliability and user-friendly interface. The specific models, including the 918, 922, 927, and 921, cater to a wide range of residential and commercial heating and cooling applications. These thermostats are designed to provide optimal temperature control while enhancing energy efficiency.

One of the main features of the White Rodgers 37E73A series is its digital display, which provides clear and intuitive access to temperature settings and programming options. The backlit display ensures readability in low-light conditions, making it convenient for users to adjust settings anytime.

The series supports both heating and cooling systems, making it versatile for various HVAC setups. Whether used in a furnace, heat pump, or air conditioning system, these thermostats can adapt to maintain the desired comfort level efficiently.

Another notable characteristic is its programmable capabilities. With the ability to set multiple temperature profiles throughout the day, users can save energy by lowering the temperature when they are away from home or sleeping. This feature not only contributes to reduced energy bills but also supports environmental sustainability by decreasing overall energy consumption.

The 37E73A series incorporates advanced technology designed for ease of installation and compatibility. The wiring system has been simplified, allowing for straightforward integration with existing HVAC systems. This ease of installation is complemented by detailed instructions that guide users through the setup process, ensuring a hassle-free experience.

Energy-saving features are also a key focus of the White Rodgers 37E73A thermostats. Many models include a built-in energy-saving mode that automatically adjusts settings during peak demand hours. This smart technology enhances the system's performance while maximizing efficiency, ultimately leading to cost savings over time.

In terms of design, the White Rodgers 37E73A thermostats boast a sleek and modern appearance that complements any home or office décor. The interfaces are designed with user comfort in mind, ensuring that adjustments can be made easily without technical expertise.

Overall, the White Rodgers 37E73A-918, 922, 927, and 921 models are exemplary choices for anyone looking to optimize temperature control in their living or working spaces. With their array of features, reliable technologies, and energy-efficient characteristics, these thermostats stand out in the HVAC market as a practical solution for climate management.