Harsco Industrial MACH C1500GG Installation & Owner's Manual page 17

Table of Required Stainless Steel Vent Adapters and Category II Motorized Dampers
Nominal
Boiler Size
Stack Size
C1500GG -
10"
C2000GG
The normally-closed motorized damper operates on 120 VAC and features an end limit switch wired into the boiler's
external interlock circuit. Upon a call for heat, the boiler's damper relay will energize and drive the damper open.
Once the damper reaches the fully-open position, the end limit switch makes contact and closes the external interlock
circuit allowing the boiler to fire. The diagram below shows the wiring necessary to install the normally-closed
motorized damper.
vent pressure must be negative (Category II) at all times to prevent leakage of harmful flue
gases into the room. Leakage of flue gases can cause serious injury or death.
Stainless Vent
Adapter
2630000226
Use caution if installing a barometric damper in the exhaust vent. The
Normally-Closed
Motorized Damper
1004906945
Page 17
MACH® Gas-Fired Boiler
A B C D
10" 10" 13" 3.38"