White Rodgers 829A-845 User Manual

WHITE-RODGERS

Operator: Save these instructions for future use!

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.

Type 829A-845 Relay has double-pole, single-throw
switching action.

This relay is especially suitable for use on hot water
heating installations having forced circulation. It permits
the use of a sensitive low voltage room thermostat to
control the operation of both burner and circulator.

It is equally well suited for use on zoned hot water
installations where a circulator and low voltage thermostat
are used for each zone.

If in doubt about whether your wiring is millivolt, line, or
low voltage, have it inspected by a qualified heating and
air conditioning contractor, electrician, or someone famil­iar with basic electricity and wiring.

Do not exceed the specification ratings.
All wiring must conform to local and national electrical

codes and ordinances.
This control is a precision instrument, and should be

handled carefully. Rough handling or distorting compo­nents could cause the control to malfunction.

TYPE 829A-845

RELAY

For Use With Low Voltage Thermostats

INSTALLATION INSTRUCTIONS

DESCRIPTION

PRECAUTIONS

CAUTION

To prevent electrical shock and/or equipment
damage, disconnect electric power to system, at
main fuse or circuit breaker box, until installation
is complete.

WARNING

Do not use on circuits exceeding specified
voltages. Higher voltages will damage control
and could cause shock or fire hazard.

ELECTRICAL DATA
Switch Action: Double-Pole, Single-Throw, normally open
Input Voltage: Terminals (1 & 2) 120V.A.C., 60Hz
Room Thermostat:

Set adjustable heat anticipator at 0.3 Amps. For fixed
anticipation thermostats, use 0.25 to 0.35 Amp. heater.

The 829A-845 relay is provided with a self-contained
transformer with a low voltage secondary output for
energizing the relay coil.

Line voltage lines should be connected to the terminals
marked “1 & 2” for power to reach the transformer.

Closing the thermostat circuit energizes the relay coil which
in turn closes the circuits between terminals 3 and 4 and also
between 5 and 6.

Opening the thermostat circuit de-energizes the relay coil,
breaking the circuits between terminals 3 and 4 and also
between 5 and 6.

WHITE-RODGERS DIVISION

EMERSON ELECTRIC CO.
9797 REAVIS RD., ST. LOUIS, MO. 63123
[phone], FAX [phone]

9999 HWY. 48, MARKHAM, ONT. L3P 3J3
[phone], FAX [phone]

R

Printed in U.S.A.

SPECIFICATIONS

Rating: Terminals (3 & 4 and 5 & 6)

Total load must not exceed 2000 VA.
Motor: 120V.A.C. 10F.L.A. 60L.R.A.

240V.A.C. 6F.L.A. 36L.R.A.

Pilot Duty:50VA @ 24 Volts

PRINCIPLE OF OPERATION

TT

RELAY
COIL

DOTTED LINES

INDICATE FIELD

WIRING

Fig. 1

N

LINE

HOT

2

1

4

3

TO LINE AND LOAD

OR PILOT DUTY

PART NO. 37-2689D

Replaces 37-2689-3

6

5

TO LINE AND LOAD

OR PILOT DUTY

9512

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
insulated type only.
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.

DIAGRAM FOR BOILER WITHOUT DOMESTIC COIL

Fig. 3

LOW VOLTAGE

2-WIRE

THERMOSTAT

Fig. 2

HOT

T

LINE

T

N

1

2

4

3

56

TYPE 668 OIL

BURNER CONTROL

(LINE VOLTAGE)

HOT
LINE

N

TO LOAD
TO POWER

TO LOAD
TO POWER

IGNITION

TRANS.

NOTE

THERMOSTAT

T

T

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.

FIELD

INSTALLED

When the thermostat calls for heat, the burner starts. The

JUMPERS

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. 3a & 4a Diagram for

Gas-Fired System

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
circulator stop.

Fig. 4

THERMOSTAT

T

T

1

2

3

56

1

3

5

HOT

LINE

2

4

BURNER CONTROL

N

4

6

X X

HIGH
LIMIT

TRANS.

X

X

TYPE 668 OIL

(LINE VOLTAGE)

X X

CIRCULATOR
CONTROL

HIGH LIMIT

BURNER

MOTOR

24 VAC

GAS VALVE

IGNITION

TRANS.

BURNER

MOTOR

CIRCULATOR

MOTOR

CIRCULATOR

MOTOR

2

FIELD INSTALLED

JUMPERS

HIGH
LIMIT

LOW
LIMIT