Installation / Operation Instruction Manual
Page 47
Brute
HIGH EFFICIENCY COMMERCIAL BOILERS AND VOLUME WATER HEATERS
®
7.D Optional Field Connections
Terminal block 8 (TB8) in the control panel is used for the ‘Safety
Chain’ and for connecting optional components such as low water
cutos, ow switches, additional high limits, and other eld-supplied
devices that must be interlocked with the boiler. These are non-
powered dry contacts only. All safeties or end switches must be
wired in series by removing the supplied jumpers.
See Figure 33
NOTE: When installing any eld-supplied options like Low Water
Cuto, High Limits, or a Flow Switch, always remove the jumper that
is factory installed at that location on the TB8 block.
7.C Hydronic Heating Using External Modulation
Control
About External Control -
When the unit is used for hydronic heating with external modulation
control, a call for heat must be supplied to the “T-T or Interlock”
terminal. Once the call is supplied the control starts the Boiler and
System pumps and begins the ignition process. Once in Run, the
unit monitors the ame signal, call for heat, safeties, and water
temperatures. The boiler setpoint is used to limit the maximum water
temperature leaving the boiler only. The modulation rate is controlled
by a 4-20mA signal supplied by an external control. (This can also
be 0-10Vdc using a converter - part number CA006100.) When
setting up a system using an external control, take care to set Anti-
Short Cycle feature to prevent “hunting “ and possible premature
component failure.
Table 15. Boiler and Pump Electrical Data
Table 16. Water Heater and Pump Electrical Data
If amp draw exceeds 7.4A max, an external pump contactor will be required.
All Boiler, Water Heater and Pump Circuits are 120V.
MMERCIAL NEOTHERM MANUAL H237
4
Boiler
Size - MBH 150-500 600-850 150-399 500 600-850
FLA < 4 amp 5 amp < 4 amp 6 amp 12 amp
MCA < 4 amp 6 amp 5 amp 8 amp 15 amp
MOP 5 amp 11 amp
8 amp
14 amp 27 amp
Boiler Electrical Data
Water Heater
Size - MBH 150-500 600-850 150 199-500 600-850
FLA < 4 amp 5 amp < 4 amp 6 amp 12 amp
MCA < 4 amp 6 amp 5 amp 8 amp 15 amp
MOP 5 amp 11 amp
8 amp
14 amp 27 amp
Water Heater Electrical Data
If amp draw exceeds 7.4A max an external pump contactor will be required. All Boiler, Water Heater, and Pump circuits are 120V.
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MMERCIAL NEOTHERM MANUAL H237
4
Boiler
Size - MBH 150-500 600-850 150-399 500 600-850
FLA < 4 amp 5 amp < 4 amp 6 amp 12 amp
MCA < 4 amp 6 amp 5 amp 8 amp 15 amp
MOP 5 amp 11 amp
8 amp
14 amp 27 amp
Boiler Electrical Data
Water Heater
Size - MBH 150-500 600-850 150 199-500 600-850
FLA < 4 amp 5 amp < 4 amp 6 amp 12 amp
MCA < 4 amp 6 amp 5 amp 8 amp 15 amp
MOP 5 amp 11 amp
8 amp
14 amp 27 amp
Water Heater Electrical Data
If amp draw exceeds 7.4A max an external pump contactor will be required. All Boiler, Water Heater, and Pump circuits are 120V.
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