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Hydronic Heating Boilers and
Domestic Water Heaters
INSTALLATION
Continued
TABLE - J
Nominal AMP Draw Data
TABLE
AMP Draw Data
Btu/Hr
Input
Controls
495,000
4.6
645,000
4.6
745,000
4.6
985,000
4.6
1,255,000
4.6
1,435,000
4.6
1,795,000
4.6
2,065,000
4.6
Figure 23A - Models 495,000 - 745,000 Btu/hr Control
Panel Component Location Drawing
Figure 23B - Models 985,000 - 2,065,000 Btu/hr Control
Panel Component Location Drawing
Approximate
Fan
Total Amps
3.4
8.0
3.4
8.0
3.4
8.0
3.4
8.0
3.4
8.0
3.8
8.4
3.8
8.4
3.8
8.4
IMPORTANT: Do not block access to the
electrical cover plate when installing electrical
conduit.
External EMS Connection to Terminal
Strip for Stage Firing Control of Burners
This unit is equipped with a factory installed terminal strip for
connection of an energy management system (EMS) to the
burner stages. The EMS terminal strip is located in the unit's
junction box. Ensure that all wiring used for connection to this
terminal strip is properly sized per the recommendations in
TABLE-L. When connecting an EMS to this terminal strip to
sequence on each stage of burner operation, the unit's internal
thermostat or electronic sequencer should be set as an
additional high limit control. This will prevent problems
between the set points of the EMS and the boiler's internal
controller.
Terminal Strip Connection Options
(Models 985,000 - 2,065,000 Btu/hr Only)
Figure 24A shows the position of jumpers as shipped from the
factory for stand-alone operation of boilers or water heaters.
Figure 24B shows connections to the terminal strip for Remote
ON/OFF control of the boiler or water heater. The 1C-1NO
jumper must be removed when making these wiring
connections. This remote ON/OFF control will provide an
Enable/Disable signal to the unit and allow the unit to operate
based on the stage set points, until the remote ON/OFF signal
is cancelled.
Figure 24C shows the connections necessary to operate the
unit as a two-stage (High/Low Fire) boiler or water heater from
an Energy Management System (EMS). The actual set point
temperatures are controlled by the EMS. The High Fire Offset
on the electronic temperature control in the unit must be set to
zero and the set point must be set to a value which will function
as an upper limit for proper operation under this two-stage
control from an EMS.
Figure 24D shows the Continuous and Intermittent terminals.
External safety devices connected to these terminals will
function to protect the unit. Devices connected to the
Intermittent terminals (B1 and B2) are monitored only when
there is an active Call for Heat. Devices connected to the
Continuous terminals (A1 and A2) are monitored continuously
and will activate an alarm (if the unit is equipped with the
alarm option) anytime the safety device senses an abnormal
condition. An additional wire may be field-installed from these
safety devices to terminals A3 or B3 (as appropriate) to
activate an alarm (if the unit is equipped with the alarm
option).
22
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