Unoccupied Recirculation
Supply fan recirculation for heating and cooling can be
achieved by connecting dry contact controls to the termi-
nal interface provided in the control panel area. This ter-
minal requires a dry contact closure from a field provided
and wired device.
VFD High Speed Control
High speed fan control can be achieved by connecting dry
contact controls to the field wired (FW) terminals 374 and
375 for the supply fan and 376 and 377 for the exhaust
fan. Only VFD units have the high speed option. These
controls could also be the following: DPST switch, de-
humidistat, CO
2
sensor, light sensor, heat sensor, timer,
building management system, etc.
301
302
304
305
305
306
307
308
320
321
322
323
324
325
326
327
328
329
UNOCCUPIED RECIRCULATION
CONTACT (OPTIONAL)
CR
Figure H3: Unoccupied recirculation for DDC controls
units
301
302
304
305
305
306
307
308
320
321
322
323
324
325
326
327
328
329
UNOCCUPIED
RECIRCULATION
CONTACT (OPTIONAL)
CR
Figure H4: Unoccupied recirculation for electro-
mechanical controls units
301
302
304
305
305
306
307
308
320
321
322
323
324
325
374
375
376
377
CR
CR
CR
OCCUPANCY
CONTACT
SUPPLY BLOWER
HIGH SPEED CONTACT
EXHAUST BLOWER
HIGH SPEED CONTACT
Figure H5: VFD high speed control
VCES-VHC-IOM-1F – VHC-36, -42 & -50
45
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