Lochinvar 90, 500 service manual Outdoor Air Reset Option, 5Electrical connections continued

Installation & Service Manual

5Electrical connections (continued)

Installation of a Remote Sensor (Boiler Application)

1.Turn OFF the main electrical power and the main manual gas shutoff to the appliance.

2.Remove the side access panel from the appliance to gain access to the thermostat.

3.Locate the sensor in the kit. Determine the location of the remote sensor and measure the amount of wire needed to connect the sensor to the thermostat. See Wiring of Remote Sensors on page 36 for guidelines.

4.Use twisted pair wire, minimum 18 gauge or larger. See Table 5A, page 33 regarding distance versus wire gauge. Ensure all wire insulation is trimmed to reveal at least 3/8" of exposed wire.

5.Connect the measured wire to the sensor wire using wire caps (see FIG. 5-5). Install .250 x .032 insulated female quick connect terminals to the end of the wires. Feed the wires through the access hole located on the back of the unit and secure the connectors to the thermostat connections (Sys/Tank) CN5 and CN6 located in the upper right-hand of the thermostat.

6.Turn on the electrical power and the main manual gas shutoff to the appliance.

7.Replace the side access panel.

8.Fire the appliance and resume operation.

ACCESS HOLE

CONNECT THE MEASURED

WIRE TO THE SENSOR WIRE

Figure 5-5_Installation of Remote Sensors

Outdoor Air Reset Option

For boilers ordered with the Outdoor Air Reset option, there is an additional control (FIG. 5-6). There are three setting knobs for Shutdown, Outdoor Air Max., and Ratio. There is also a switch to turn the outdoor air shutdown feature On or Off. An O.A. Sensor is also included.

Installation of a Tank Sensor (Water Heater Application)

1.Turn OFF the main electrical power and the main manual gas shutoff to the appliance.

2.Remove the side access panel from the appliance to gain access to the wire harness.

3.Locate the two blue wires with a tag notating the remote thermostat sensor. Feed the blue wires through the access hole located on the back of the unit.

NOTE: It will be necessary to add additional wire to reach from the appliance to the remote water source. Use twisted pair wire, minimum 18 gauge or larger. See Table 5A, page 33 regarding distance versus wire gauge. Ensure all wire insulation is trimmed to reveal at least 3/8" of exposed wire.

4.Connect the wires to the sensor wire using wire caps.

5.Turn on the electrical power and the main manual gas shutoff to the appliance.

6.Replace the side access panel.

7.Fire the appliance and resume operation.

(c)2002 L.C.		55			CN1				CN2			CN3
													OJ1
CN7		50	60
	D4		65	O.A. SENSOR								CN4	C10
CN8					ON ENABLE
	45
		VR3			SW1
		40	70		DISABLE
	W1			O.A. SHUTDOWN								CN5	OJ2
		SHUTDOWN
									R6	R4	C7
		55				1.0							C9
					0.9							CN6
		50	60			1.1
				0.8		1.2
	45		65	0.7			1.3					J4
										W3
				0.6			1.4
		VR1				VR2						R8
					0.5
		40	70			1.5
CN1									W1	W2
		O.A. MAX.			RATIO
													CN9
	160				10 11
		200		9						10
140				8		12
							R15	R16	5			15
				7		13
			220
120				6		14
				5	VR2	15		(F-)0		VR3		20
		240
	OFF		DIFFERENTIAL						HIGH-FIRE
	SETPOINT			TST2314					OFFSET

Figure 5-6_Optional Outdoor Air Reset Control

37