TYPICAL SYSTEM WIRING TABLE

50A55

TERMINAL

SYSTEM COMPONENT

TERMINAL

TYPE

CONNECTION

W

 

low voltage thermostat W terminal (or equivalent)

G

Terminal

low voltage thermostat G terminal (or equivalent)

R

block with

low voltage thermostat R terminal (or equivalent)

Y

captive

low voltage thermostat Y terminal (or equivalent)

 

screws

(2nd wire from Y terminal goes to 24 VAC HOT side of

 

 

compressor contactor coil)

C

 

24 VAC COMMON side of compressor contactor coil

MV (2 terminals)

 

gas valve (both gas solenoids are connected in parallel)

TR

 

24 VAC transformer (low voltage COMMON side)

TH

 

24 VAC transformer (low voltage HIGH side)

FP

12-pin

flame sensor probe*

PS

connector

pressure switch INPUT

HLI

& harness

high limit INPUT

HLO

 

high limit OUTPUT

GND

 

MUST BE RELIABLY GROUNDED TO CHASSIS

(3 unused terminals)

 

 

 

 

 

IND

 

inducer HOT side

IGN

4-pin

ignitor HOT side

IND N

connector

inducer NEUTRAL side

& harness

IGN N

ignitor NEUTRAL side

 

 

 

 

COOL

spade terminal

circulator blower COOL SPEED terminal

 

 

 

HEAT

spade terminal

circulator blower HEAT SPEED terminal

 

 

 

PARK (2 terminals)

spade terminal

unused circulator blower terminals

 

 

 

LINE

spade terminal

input voltage (120 VAC) HOT side

 

 

 

XFMR

spade terminal

24 VAC transformer line voltage HOT side

 

 

 

HUM (optional)

spade terminal

humidifier HOT side

 

 

 

EAC (optional)

spade terminal

electronic air cleaner HOT side

 

 

 

CIR N

spade terminal

circulator blower NEUTRAL terminal

 

 

 

LINE N

spade terminal

input voltage (120 VAC) NEUTRAL side

 

 

 

XFMR N

spade terminal

24 VAC transformer line voltage NEUTRAL side

 

 

 

HUM N (optional)

spade terminal

humidifier NEUTRAL side

 

 

 

EAC N (optional)

spade terminal

electronic air cleaner NEUTRAL side

 

 

 

* maximum recommended flame probe wire length is 36 inches.

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White Rodgers 50A55-438 installation instructions Connection, Typical System Wiring Table

50A55-438 specifications

The White Rodgers 50A55-438 is a highly versatile and efficient thermostat widely recognized for its reliability and advanced features. Designed with both functionality and user-friendliness in mind, this device serves as an excellent solution for managing heating and cooling systems in residential and commercial applications.

One of the standout features of the 50A55-438 is its compatibility with a wide range of HVAC systems. It supports single-stage and multi-stage heating and cooling units, allowing users to integrate it seamlessly into various setups. This versatility makes it suitable for diverse environments, from single-family homes to larger commercial spaces.

The thermostat is equipped with a user-friendly interface, complete with a large, easy-to-read display that simplifies temperature adjustments and system monitoring. The illuminated screen enhances visibility, allowing users to operate the device even in low-light conditions. Its intuitive menu system guides users through programming options, making it accessible for individuals without extensive technical knowledge.

In terms of energy management, the White Rodgers 50A55-438 utilizes advanced algorithms that promote energy efficiency. The programmable capabilities enable users to set specific heating and cooling schedules, optimizing comfort while minimizing energy consumption. This feature is particularly beneficial for those looking to reduce utility costs while maintaining a pleasant indoor climate.

The thermostat also includes features such as a temperature lock, which prevents unauthorized adjustments, making it an ideal choice for rental properties or commercial sites where temperature control is critical. Additionally, it offers an automatic changeover function, allowing the device to switch between heating and cooling modes based on the ambient temperature, thus ensuring consistent comfort year-round.

The White Rodgers 50A55-438 is built to last, featuring robust construction designed to withstand the rigors of daily use. It operates quietly, contributing to a serene environment in homes and workplaces. Furthermore, installation is straightforward, as the thermostat is designed to fit standard wall plates and connections, enabling a hassle-free setup process.

In summary, the White Rodgers 50A55-438 stands out as a top choice for those seeking an advanced, efficient, and easy-to-use thermostat. Its compatibility with various HVAC systems, programmable features, energy-saving capabilities, and robust design make it an excellent investment for effective climate control. Whether for residential or commercial use, this thermostat meets the demands of modern temperature regulation with precision and reliability.