Langley/Empire DV-20E-5, DV-40E-5 Wiring, Replacement of Thermistor with 24 Volt Wall Thermostat

WIRING

OPTIONAL WALL MOUNT THERMOSTAT

DISCONNECT INTEGRAL THERMOSTAT "R", "W", AND "C" LEADS AND ATTACH WALL THERMOSTAT AS SHOWN

XFMR

WR

					GV		V			V
THERMOSTAT							24			115
ELECTRONIC					BRN	BRN	GRY	GRY	WHT	BLK
INTEGRAL
WHT	YEL	RED
										RED LED
										STATUS
										LIGHT
PS		ORG
		ORG
		GRN	9	6	3					IGN
ROS		RED	8	5	2
			7	4	1
RED		RED
LS								BLU
	YEL
								BLU
										GND
										WHITE
				6	3					BLACK
										ON/OFF
				5	2
	FS			4	1
							PUR
							PUR
										INDUCER
			WHT				BLK			BLOWER

CIRCULATING AIR BLOWER

			GV = GAS VALVE
			LS = LIMIT SWITCH
			FS = FLAME SENSOR
			XFMR = TRANSFORMER
			PS = PRESSURE SWITCH
			IGN = HOT SURFACE IGNITOR
			ROS = ROLLOUT LIMIT SWITCH
		CORDSET 115 VAC
ON/OFF	BLACK HOT			BLACK NEUTRAL
	SMOOTH			RIBBED
POWER SWITCH
	INSULATION			INSULATION

CIRCULATING AIR

BLOWER MOTOR

COMBUSTION AIR

INDUCER MOTOR

HOT SURFACE

IGNITOR

FLAME SENSOR

		PRIMARY	115 VAC
			TRANSFORMER
		SECONDARY	24 VAC	COMMON
3A FUSE
THERMOSTAT	LIMIT	ROLLOUT	PRESSURE	GAS
	SWITCH	LIMIT SWITCH	SWITCH	VALVE

115VAC

24VOLT FIELD INSTALLED

IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE

APPLIANCE MUST BE REPLACED, IT MUST BE REPLACED

WITH A WIRE OF AT LEAST 105 ° C TEMPERATURE RATING.

The appliance, when installed, must be electrically grounded in ac- cordance with local codes or, in the absence of local codes, with the National Electrical Code,ANSI/NFPA70 or Canadian Electrical Code, CSA C22.1, if an external electrical source is utilized. This appli- ance is equipped with a three-prong [grounding] plug for your protection against shock hazard and should be plugged directly into a properly grounded three-prong receptacle. Do not cut or remove the grounding prong from this plug. For an ungrounded receptacle, an adapter, which has two prongs and a wire for ground- ing, can be purchased, plugged into the ungrounded receptacle and its wire connected to the receptacle mounting screw. With this wire completing the ground, the appliance cord plug can be plugged into the adapter and be electrically grounded.

CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.

Note: For testing flame sensor circuit use a micro-amp meter in series with sensor. Minimum current should be 1 micro-amp dur- ing operation. Be careful as flame sensor is in the 115VAC circuit. If current is below 1 micro-amp, remove sensor, clean with light sandpaper and retest.

Note: This heater is equipped with a remote bulb electronic thermistor control located down low at the back of the furnace. Sometimes due

to field locations different air currents may effect the control sensing of the thermistor. This sensing bulb can be re-located if necessary to provided for better room air sensing and control.

Replacement of Thermistor with 24 Volt Wall Thermostat

1.If furnace is installed, turn off gas supply and electric supply.

2.Remove casing front.

3.Remove black hose from front nipple on pressure switch.

4.Remove junction box cover (4 screws).

5.Please refer to wiring diagram for removal of the following wires.

6.Internal Electronic Thermostat/Temperature Control Board

Attention! No 24 volt wall thermostat wires are to be at- tached to the internal electronic thermostat.

7.Control Board

A.Remove white wire form screw marked W.

B.Remove yellow wire from screw marked C.

C.Remove red wire from screw marked R.

8.Route (2) wires from any 24 volt wall thermostat through the casing back of furnace to the screws marked W and R on the control board.

9.Replace junction box cover (4 screws).

10.Replace black hose onto front nipple on pressure switch.

11.Replacement of thermistor with 24 volt wall thermostat is completed.

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