Mammoth 800 to 5500 CFM: Dedicated Outdoor Air System with Enthalpy Wheels (VHC) - Manual (Page 29)

MAMM-VHC-IOM-1A (JANUARY 2013) 29
Smoke Detector
Locate in a normally occupied area of premises. Recom-
mended for compliance to NFPA-90A and IMC Code 606.
VHCs can be equipped with a duct mount smoke detector
which will monitor the air when passing through the duct
system into the VHC. When sufficient smoke is detected,
an alarm condition is activated. By connecting the occupied
timer/sensor contacts to the NC alarm auxiliary contacts on
the duct sensor, an alarm condition will open the auxiliary
contact and stop operation of the VHC.
Dirty Filter Sensor
The VHCs can be equipped with dirty filter sensors which
monitor the pressure across the filters and close the con-
tacts when the filters become restricted with dirt. Field
wired connections can be made to the terminal interface for
both the supply and exhaust filter sensors.
301
302
410
411
24V 24V NC C
1 2 15 16
Figure F6: Smoke detector
301
302
304
305
305
306
307
308
320
321
322
323
324
325
326
327
328
329
DIRTY SUPPLY FILTER
24 VAC+ OUTPUTS
20 VA MAXIMUM DIRTY EXHAUST FILTER
Figure F7: Dirty filter control
IMPORTANT
On DDC units, there is no dirty filter sensor output to con-
nect to. Rather, the dirty filter sensor is connected to the
DDC controller and will display a dirty filter alarm on the
BacStat II (user interface) when it senses the filter is dirty.
IMPORTANT
This wiring configuration cannot be used on DDC units
that are scheduled on/off through software.