Installation & Service Manual

5Electrical connections (continued)

Pump Wiring for a Heating Boiler

The heating boiler circulating pump must be purchased locally. The maximum load for the pump switched by the

Temperature Adjustment

Operating Temperature Control

internal pump relay must not exceed 1 HP. The current draw for a field installed 120 VAC pump MUST be added to the boiler’s current draw to determine the minimum wire size for 120 volt service.

NOTICE

The temperature controller is pre-set at the factory with test settings. You may need to adjust the settings to meet your specific needs.

TABLE - 5B

AMP DRAW DATA

45,000 thru 260,000 Btu/hr Models

 

 

MAXIMUM

 

 

FIRING CONTROLS

TOTAL AMPS

 

 

 

@ 120 VAC

 

 

 

 

 

 

M9 with Performance Loop Pump

1.25

 

 

 

 

 

WARNING

Return water temperatures must not be less

than 140°F. If lower return water

 

temperatures are required, follow the

 

instructions for Low Temperature Bypass

 

Requirements, see page 28.

Locating Temperature Control

Remove the control panel door on the front of the unit in order to locate and access the temperature control.

IGNITION MODULE

TEMPERATURE CONTROL

MANUAL RESET HIGH LIMIT (IF EQUIPPED)

PUMP RELAY

TRANSFORMER

Temperature Control Settings

Remove the control panel door on the front of the unit in 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 37.

The three setting knobs on the temperature control are for Set point, Differential, and High-Fire Offset (see FIG. 5-3).

Figure 5-2_Intermittent Pilot System M9 Control Panel

Figure 5-3_Temperature Control

35

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Lochinvar 45,000 - 260,000 BTU/HR service manual Temperature Adjustment, AMP Draw Data

45,000 - 260,000 BTU/HR specifications

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