White Rodgers 3049-64, 3049-115 Installation Instructions

3049-64 & 3049-115

WHITE-RODGERS

Universal Replacement

Mercury Flame Sensors

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

The 3049-64 and 3049-115 Mercury Flame Sensors are designed as universal replacements for types currently used on cycling pilot ignition systems. They will replace sensors used in “thermocouple” type (slip-in) pilot burners. The bulbs on both Flame Sensors have additional grooves to accept retaining clips that allow the bulb to match most existing types.

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

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.

!WARNING

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

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.

Shut off main gas to heating system until installation is complete.

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.

Following installation or replacement, follow appliance manufacturer's recommended installation and/or service instructions to insure proper operation.

			SPECIFICATIONS
Electrical Rating:	3 Amp @ 30 VAC	Sensing Bulb Type: Universal Replacement
	1 Amp @ 120 VAC	Thermocouple Slip-in
	.5 Amp @ 240 VAC	Ambient Temperature: -20° to +175°F
Switch Action: SPDT		Element Tip to +1400°F
Capillary Length:	48 Inches

ATTENTION!

This product contains mercury. There will not be any exposure to mercury under normal conditions of use. This product may replace a unit which contains mercury. Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury. Wearing nonabsorbent gloves, take up the spilled mercury with sand or other absorbent material and place into a container which can be sealed. If a cell becomes damaged, the unit should be discarded. Mercury must not be discarded in household trash. When this unit or the unit it is replacing is to be discarded, place in a suitable container and return to us.

WHITE-RODGERS DIVISION

EMERSON ELECTRIC CO.

9797 REAVIS RD., ST. LOUIS, MO. 63123-5398

[phone], FAX [phone]

9999 HWY. 48, MARKHAM, ONT. L3P 3J3

[phone], FAX [phone]

	PART NO. 37-3599C
Printed in U.S.A.	Replaces 37-3599B
	9711

Type 3049-64 is equipped with a “high mass” element, and is used in applications where a medium sensor response time is desired (typically 45 to 60 seconds). Type 3049-115 contains a “low mass” element, and is used in applications where a short response time is required (usually between 30 to 45 seconds).

In general, consideration for response time is based on whether or not the control system uses some form of prepurge or fan delay timer. Systems using delay timers may require the use of the low mass 3049-115 so the element responds to the pilot before the delay time has elapsed.

This is especially true in cases where rooftop units are equipped with delay timers. These systems are subjected to low ambients (20°F or less) which slightly increases the “heat up” time for the flame sensor. The use of the 3049-115 reduces the time lag between the original call for heat and the time the main burner comes on. This causes main burner operation to occur shortly before the system blower comes on, preventing cold air drafts on start-up.

INSTALLATION

TYPES MANUFACTURED

The 3049 Flame Sensors have been manufactured with four different terminal/panel configurations. Figure 1 illustrates terminal layout and internal switch action for each variation. Note that the positions of the terminal numbers remain the same for all panels, yet different terminals may be used for system wiring.

The service technician must identify the terminal configuration on the existing sensor, and confirm that it matches the replacement. If the sensor cases do not match, replacement cannot be made.

Note that Panel C (fig 1C) uses terminals 2 and 4, which are normally open. Although a SPST switch action occurs in the C panel, it can be replaced by the SPDT (single-pole double-throw) switch action of panel B or D. System wiring must be connected to terminals 2 and 4 of the new sensor (Terminal 3 is not used in this case.)

1.Turn off gas valve and power until replacement is complete. Remove the defective 3049 sensor from the pilot burner. Do not disconnect wiring from switchcase. Do not uncoil capillary of new flame sensor.

2.Align tip of defective flame sensor with tip of replacement.

3.Install C-rings on new sensor to match the positions of the rings of defective sensor.

4.Insert replacement sensor in pilot burner. Uncoil only enough capillary to allow the sensor to be installed. Be sure the new sensing bulb is in the same position as the unit it replaced.

5.Carefully uncoil capillary of new sensor by grasping capillary at switchcase and sensing bulb, then gently stretch coil until switchcase reaches the mounting position. Mount switchcase and transfer wiring (wire by wire).

6.Turn on gas and power, and cycle system a number of times to insure proper operation.

3049 TERMINAL PANEL			3049 SWITCH ACTIONS
			N.C.	1 (COM)
			3 (COLD)
A
	3	1
		2		2 (HOT)
			N.O.
		4	N.C.	4 (COM)
			3 (COLD)
B	3
				2 (HOT)
		2
				N.O.
		4		4 (COM)
C		2		2 (HOT)
			N.O.
		4	N.C.	4 (COM)
D	3		3 (COLD)
		2		2 (HOT)

N.O.

Figure 1

CAPILLARY

UNIVERSAL REPLACEMENT BULB

When the new flame sensor is installed, the upper 3⁄4” of sensing bulb will be engulfed in pilot flame. If, after 60 seconds, flame sensor does not transfer (switch to hot position), check position of sensing bulb, pilot gas pressure and draft conditions.

2