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5
Electrical connections
Pump Wiring for a Heating Boiler
The heating boiler circulating pump must be pur chased
locally. The max i mum load for the pump switched by the
internal pump relay must not exceed 1 HP. The current draw
for a field installed 120 VAC pump MUST be add ed to the
boiler's current draw to de ter mine the minimum wire size for
120 volt service.
TABLE - 5B
AMP DRAW DATA
45,000 thru 260,000 Btu/hr Models
FIRING CONTROLS
M9 with Performance Loop Pump
IGNITION MODULE
TEMPERATURE CONTROL
PUMP RELAY
Figure 5-2_Intermittent Pilot System M9 Control Panel
MAXIMUM
TOTAL AMPS
@ 120 VAC
1.25
MANUAL RESET HIGH LIMIT (IF EQUIPPED)
TRANSFORMER
(continued)
Temperature Adjustment
Operating Temperature Control
The temperature controller is pre-set at the
NOTICE
factory with test settings. You may need to
adjust the settings to meet your specific
needs.
Return water temperatures must not be less
WARNING
than 140°F. If
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.
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 38.
The three setting knobs on the temperature control are for Set
point, Differential, and High-Fire Offset (see FIG. 5-3).
Figure 5-3_Temperature Control
Installation & Service Manual
lower return water
35
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