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)

RO1

 

rollout switch OUTPUT

RO2

12-pin

rollout switch INPUT

FP

connector

flame sensor probe*

PS

& harness

pressure switch INPUT

HLI

 

high limit INPUT

HLO

 

high limit OUTPUT

GND

 

MUST BE RELIABLY GROUNDED TO CHASSIS

(unused terminal)

 

 

IND

2-pin

inducer HOT side

connector

IGN

ignitor HOT side

& harness

 

 

 

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

EAC (optional)

spade terminal

electronic air cleaner HOT side

HUM (optional)

spade terminal

humidifier 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

EAC N (optional)

spade terminal

electronic air cleaner NEUTRAL side

HUM N (optional)

spade terminal

humidifier NEUTRAL side

* maximum recommended flame probe wire length is 36 inches.

5

Page 5
Image 5
White Rodgers 50A55-285 installation instructions Connection, Typical System Wiring Table

50A55-285 specifications

The White Rodgers 50A55-285 is a versatile and reliable universal thermostat designed for HVAC systems. Ideal for both residential and commercial applications, it is engineered to enhance comfort while optimizing energy efficiency. This model is especially favored for its adaptability to a range of heating and cooling systems, including gas, oil, electric, and heat pumps.

One of the standout features of the 50A55-285 is its compatibility with a variety of HVAC systems, which includes multi-stage heating and cooling. This versatility allows homeowners to seamlessly integrate the thermostat into their existing setups, making it a popular choice for retrofit installations. The thermostat supports 24V AC applications while providing the necessary control for both single-stage and multi-stage units.

The 50A55-285 utilizes advanced technology to ensure precise temperature control. It includes an advanced microprocessor that provides improved performance and a user-friendly experience. This technology aids in reducing energy consumption while maintaining the desired temperature within the home or commercial space.

Users will appreciate the easy-to-read LCD display, which offers clear visual feedback on temperature settings and system status. The backlit display enhances readability even in low-light conditions. The intuitive interface comes equipped with simple navigation buttons, allowing users to program settings with minimal effort.

Energy efficiency is another hallmark of the 50A55-285. It features programmable options that enable homeowners to set their desired temperature according to specific schedules, further optimizing energy use. Users can easily program daily and weekly schedules, ensuring the system only operates when needed, which can lead to substantial cost savings on energy bills.

Safety is a critical aspect of the 50A55-285’s design; it incorporates features such as adjustable temperature limits and a built-in safety shut-off function. These characteristics safeguard against system malfunctions and enhance users’ peace of mind.

Overall, the White Rodgers 50A55-285 thermostat is a sophisticated solution for temperature control. Its compatibility with various systems, user-friendly features, and energy-saving capabilities make it an outstanding choice for anyone looking to improve their comfort and efficiency in heating and cooling. Whether for a residential or commercial application, this thermostat stands out as a reliable choice in modern HVAC technology.