35
Installation & Service Manual
5
Electrical connections
(continued)
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
MAXIMUM
TOTAL AMPS
@ 120 VAC
M9 with Performance Loop Pump
1.25
TEMPERATURE
CONTROL
PUMP RELAY
MANUAL RESET HIGH LIMIT
(IF EQUIPPED)
IGNITION MODULE
TRANSFORMER
Figure 5-2_Intermittent Pilot System M9 Control Panel
Temperature Adjustment
Operating Temperature Control
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.
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.
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
Summary of Contents for CBN045
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