Lochinvar 495, 065, 000 - 2 Temperature Control Settings, Table - M, Table-L, Operation

Hydronic Heating Boilers and Domestic Water Heaters

OPERATION

Continued

Figure 34 - Locating Temperature Control

Temperature Control Settings

There are three setting knobs on the temperature control unless your unit is specified as a boiler only with an outdoor air reset option. If your unit is a boiler only with an outdoor air reset option, there are additional controls for this option. They are explained under Outdoor Air Reset Option, page 31.

The three setting knobs on the temperature control are for Set Point, Differential, and High-Fire Offset (see Figure 35).

Figure 35 - Temperature Control Setting Knobs

TABLE-L

	TABLE - M		Maximum
Maximum Set Point Determination Setpoint
			n
		Max.
OJ1	OJ2	Set Point

Connected Connected 230°F

Cut Connected 190°F

Connected Cut 200°F

Cut Cut 160°F

Maximum Set Point Determination

The maximum set point for the control is factory set. Boilers are set to 230°F max., water heaters are set to 190°F max., and specialty state and local codes to 200°F.

These maximum set points are established by not cutting/cutting the OJ1 and OJ2 jumpers located on the right side of the temperature controller (see Figure 35). The maximum set point is determined as shown in TABLE-M.

Note: Anytime that OJ1 is the only jumper cut, a new overlay is required under the Set Point knob on the temperature controller because the scale has changed to a maximum of 190°F.

Anytime the OJ2 jumper is cut (with or without OJ1), a new overlay is required under the Set Point knob on the temperature controller because the scale has changed to a maximum of 200°F.

Set Point

The Set Point knob specifies the target water temperature in degrees, Fahrenheit. After the water temperature reaches the set point, the temperature control shuts off the burners.

Differential

The Differential specifies the number of degrees below the set point that the control will allow the water temperature to drop before it brings the unit back on again.

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