White Rodgers 829A-845 User Manual

WHITE-RODGERS

TYPE 829A-845

RELAY

For Use With Low Voltage Thermostats

INSTALLATION INSTRUCTIONS

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.

DESCRIPTION

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.

PRECAUTIONS

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.

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.

SPECIFICATIONS

ELECTRICAL DATA	Rating: Terminals (3 & 4 and 5 & 6)
Switch Action: Double-Pole,Single-Throw,normallyopen	Total load must not exceed 2000 VA.
Input Voltage: Terminals (1 & 2) 120V.A.C., 60Hz	Motor: 120V.A.C.	10F.L.A.	60L.R.A.
Room Thermostat:	240V.A.C.	6F.L.A.	36L.R.A.
Set adjustable heat anticipator at 0.3 Amps. For fixed	Pilot Duty:50VA @ 24 Volts
anticipation thermostats, use 0.25 to 0.35 Amp. heater.

PRINCIPLE OF OPERATION

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.

			T	T
			RELAY
			COIL
		2	4	6
		N
	DOTTED LINES	LINE
	INDICATE FIELD	HOT
	WIRING
		1	3	5
	Fig. 1		TO LINE AND LOAD	TO LINE AND LOAD
			OR PILOT DUTY	OR PILOT DUTY

	WHITE-RODGERS DIVISION	PART NO. 37-2689D
	EMERSON ELECTRIC CO.
	9797 REAVIS RD., ST. LOUIS, MO. 63123	Replaces 37-2689-3
	[phone], FAX [phone]
		Printed in U.S.A.

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

		T T	HOT
			LINE
		1	N
			2
	LOW VOLTAGE		TO LOAD
		3	4
	2-WIRE
			TO POWER
	THERMOSTAT		TO LOAD
		5	6
			TO POWER

Fig. 2

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

DIAGRAM FOR BOILER WITH DOMESTIC COIL WITH STORAGE TANK				X	X
The low limit control maintains domestic hot water at				TYPE 668 OIL
desired temperature year-round.
				BURNER CONTROL
When the thermostat calls for heat, both the burner and				(LINE VOLTAGE)
circulator start. If excessive boiler temperature causes
high limit to open, the circulator continues to run, but the		HOT	LINE	N		IGNITION
burner shuts down until the high limit recloses.
						TRANS.
When the thermostat is satisfied, both the burner and	THERMOSTAT
circulator stop.	T	T
		1		X	X	BURNER
				2
						MOTOR
		3		4
Fig. 4						CIRCULATOR
		5
						MOTOR
				6
	FIELD INSTALLED
	JUMPERS				HIGH	LOW
					LIMIT	LIMIT

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