WIRING

All wiring should be done in accordance with local and national electrical codes and ordinances.

When using this relay to control both line and low voltage loads, wires must be formed so that low voltage wires do not touch line voltage terminals and line voltage wires must not touch low voltage terminals. Low voltage wires (except to “Therm” terminals) must be N.E.C. Class 1

T T

1

2

LOW VOLTAGE

HOT

LINE

N

TO LOAD

insulated type only.

2-WIRE

3 4

TO POWER

If the manufacturer of the boiler or the burner has supplied wiring diagrams, then follow such recommendations. If none are supplied, the diagrams shown on the next two pages show representative circuits. Type 829A-845 is for 120v input only, but the contacts can be used to switch 240v loads.

THERMOSTAT

5 6

Fig. 2

TO LOAD TO POWER

TYPE 668 OIL

BURNER CONTROL

(LINE VOLTAGE)

DIAGRAM FOR BOILER WITHOUT DOMESTIC COIL

NOTE

This circuit can be functionally duplicated by using a Type 809A Relay (SPST) instead of a Type 829A Relay (DPST). Refer to sheet included with Type 809A Relay for wiring diagram.

When the thermostat calls for heat, the burner starts. The circulator also starts if boiler temperature is above setting of circulator control.

If excessive boiler temperature causes high limit to open, the circulator continues to run but the burner shuts down until the high limit recloses.

When low boiler temperature causes circulator control to open, the burner stays on but the circulator stops until the circulator control recloses. When thermostat is satisfied, both burner and circulator stop.

Fig. 3

HOT

LINE

 

 

 

 

N

 

TRANS.

 

 

 

 

 

IGNITION

THERMOSTAT

 

 

 

 

 

T

T

 

 

 

 

 

 

 

X

X

BURNER

 

1

 

2

 

 

 

 

 

 

MOTOR

 

3

 

4

 

 

FIELD

 

 

 

 

CIRCULATOR

INSTALLED

5

 

6

 

 

 

MOTOR

JUMPERS

 

 

 

 

 

 

 

 

 

 

 

 

 

HIGH

CIRCULATOR

 

 

 

 

LIMIT

CONTROL

 

 

 

 

 

24 VAC

 

 

 

 

 

GAS VALVE

 

 

 

 

HIGH LIMIT

TRANS.

Fig. 3a & 4a Diagram for

Gas-Fired System

X X

DIAGRAM FOR BOILER WITH DOMESTIC COIL WITH STORAGE TANK

The low limit control maintains domestic hot water at desired temperature year-round.

When the thermostat calls for heat, both the burner and circulator start. If excessive boiler temperature causes high limit to open, the circulator continues to run, but the burner shuts down until the high limit recloses.

When the thermostat is satisfied, both the burner and THERMOSTAT circulator stop.

Fig. 4

 

 

 

TYPE 668 OIL

 

 

 

 

BURNER CONTROL

 

 

 

 

(LINE VOLTAGE)

 

 

HOT

LINE

N

 

IGNITION

 

 

 

 

 

 

 

 

 

 

TRANS.

T

T

 

 

 

 

 

1

2

X

X

BURNER

 

 

 

 

 

 

 

 

MOTOR

 

3

 

4

 

 

 

 

 

 

 

 

5

 

 

 

CIRCULATOR

 

 

 

 

MOTOR

 

 

 

6

 

 

 

 

 

 

FIELD INSTALLED

 

 

JUMPERS

 

 

HIGH

LOW

 

 

LIMIT

LIMIT

2

Page 2
Image 2
White Rodgers 829A-845 specifications Wiring, Diagram for Boiler Without Domestic Coil

829A-845 specifications

The White Rodgers 829A-845 is a highly regarded multi-stage programmable thermostat designed for residential heating and cooling systems. This model stands out for its advanced features and user-friendly interfaces, making it a popular choice among homeowners seeking efficient climate control.

One of the main features of the 829A-845 is its programmable capabilities. Homeowners can take advantage of a 7-day programming schedule, which allows tailored temperature settings for different days of the week. This flexibility ensures that the system can adapt to varying occupancy patterns, providing comfort when needed while saving energy during unoccupied periods. Users can set up to four distinct temperature changes per day, optimizing both comfort and efficiency.

The thermostat is equipped with an intuitive digital display that simplifies operation. The large screen provides easy-to-read temperature readings and programming options, ensuring that users can navigate settings without hassle. Additionally, the backlit display allows for visibility in low-light conditions, enhancing usability.

The White Rodgers 829A-845 employs advanced technologies such as Adaptive Recovery, which helps the system achieve the desired temperature by pre-conditioning the space before the scheduled time. This feature ensures that rooms reach their set temperature at the programmed times, promoting energy savings while maintaining comfort.

For compatibility, the thermostat supports a wide range of HVAC systems, including gas, oil, and electric systems, as well as heat pumps and conventional air conditioners. This versatility makes it suitable for various home setups. The device also includes a system changeover feature, enabling easy switching between heating and cooling modes as seasonal needs change.

Built with a user-friendly interface, the White Rodgers 829A-845 requires minimal technical knowledge for installation and operation. Standard installation procedures make it accessible for most DIY enthusiasts, while its robust design ensures reliability and longevity over time.

Energy efficiency is a key characteristic of the 829A-845, as it serves to minimize energy consumption while providing optimal comfort. Its programmable nature allows users to implement energy-saving settings that align best with their unique lifestyles. With a combination of advanced features, ease of use, and compatibility with a broad spectrum of systems, the White Rodgers 829A-845 proves to be a solid investment for any homeowner looking to upgrade their heating and cooling controls.