66-1142—1 G.R. Rev. 03-04
www.honeywell.com
MCBA14C COMMERCIAL BOILER CONTROL SYSTEM
Automation and Control Solutions
Honeywell International Inc.
Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North
35 Dynamic Drive
Golden Valley, MN 55422
Scarborough, Ontario
M1V 4Z9
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
3.
Check the ratings given in the instructions and on the
product to make sure that the product is suitable for your
application.
4.
Installer must be a trained, experienced combustion
service technician.
5.
Disconnect the power supply before beginning installation
to prevent electrical shock and equipment damage. More
than one disconnect may be involved.
6.
All wiring must comply with applicable local electrical
codes, ordinances and regulations.
7.
After installation is complete, check out product operation
as provided in these instructions.
WARNING
Fire or Explosion Hazard.
Can cause severe injury, death, or property damage.
To prevent possible hazardous burner operation, verify
safety requirements each time a control is installed on a
burner.
WARNING
Electrical Shock Hazard.
Can cause serious injury, death or property damage.
Disconnect power supply before beginning installation to
prevent electrical shock and equipment damage. More
than one disconnect may be involved.
WIRING
WARNING
Electrical Shock Hazard.
Can cause serious injury, death or property damage.
Disconnect power supply before beginning wiring to
prevent electrical shock and equipment damage. More
than one disconnect may be involved.
Ground Connection
The ground connection on the controller must not be used as a
central ground connection for the 120 Vac connections.
1.
Use the common ground terminal next to the controller,
close to connector X1.
2.
Connect the central ground terminal with the connection
contact of the controller.
3.
Connect the ground wire of the main power connector, the
CH pump, the DHW pump (if present) and the ignition wire
to the central ground terminal.
Electrical Connections
Main Power Line
1.
Hot (L1) to connector X1-L.
2.
Neutral (L2) to connector X1-N.
3.
Ground to central ground terminal, not to Ground on X1.
CH Pump; DHW Pump Power Line(s)
1.
Hot to connector X1-4 (CH Pump) or X1-5 (DHW Pump).
2.
Neutral to connector X1-3.
3.
Ground to central ground terminal, not to Ground on X1.
Low Voltage Connections
Use 18 AWG or larger wires.
1.
Wire according to specifications, following all local ordi-
nances and requirements.
2.
Do not bundle the low voltage wires with the ignition cable,
120 Vac wires, CH Pump or DHW Pump.
3.
The low voltage wires for the minimal gas pressure switch,
DHW thermostat, air pressure switch, and gas valve can be
bundled together.
4.
Bundle the wires for the fan and join them with the other
24V low-voltage wires.
5.
Bundle the wires for the NTC sensors and the PWM pump
control separately.
6.
Do not bundle the ionization wire with the high voltage
cables, but it can be joined with the other 24V wires.
High Voltage Cable
1.
Always use a grommet when placing the high voltage
cable.
2.
Never join the high voltage cable with other wires.
