BMC and
MULTIPLE MODULATING BOILERS
DIRECT HEATING PIPING DIAGRAM
Outdoor
Sensor
BMC
OUTPUT RATINGS:
120VAC, 6A RESISTIVE
1A PILOT DUTY, 15A TOTAL FOR ALL CIRCUITS
INPUT RATINGS:
115VAC 60Hz , 30VA MAX
USE COPPER WIRE, CLASS 1 WIRE ONLY.
Full Modulation Sequencing Control | |
SYSTEM |
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ENCLOSED
ENERGY
MANAGEMENT
EQUIPMENT
LISTED
99RA
CAUTION: RISK OF ELECTRIC SHOCK
More than one disconnect switch may be required to
PROGRAM | RUN | DO NOT APPLY ANY VOLTAGE |
TO INPUT TERMINALS |
| PWR | SYS |
| A | B |
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| C D | A | B | C | D | OUTDOOR | SYSTEM | PROVE | SHUTDOWN | EXTENSION |
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| CUR / VLT | CUR / VLT | CUR / VLT | CUR / VLT | TEMP | TEMP | /DHW | /SETBACK | MODULE |
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| L | N |
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| - + + | - + + | - + + | - + + | T O | T O | O | O |
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| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 11 12 | 13 14 15 16 17 18 19 20 21 22 23 24 | 25 26 27 28 29 30 31 32 |
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120VAC |
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Boiler 1 | Boiler 2 |
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| Boiler 3 | Boiler 4 | |||||
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| Building Heating Loop |
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System:
The BMC provides 4 modulating boilers. The boilers are piped in Reverse Return on the primary loop. The System output is controlling the System Pump.
Weil McLain is aware that each installation is unique. Thus, Weil McLain is not responsible for any installation related to any electrical or plumbing diagram generated by Weil McLain. The provided illustrations are to demonstrate Weil McLain’s control operating concept only.
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