DDC Controls Unit
Inputs
• Occupied ventilation
–
Dry contact
• Unoccupied recirculation (if equipped)
–
Dry contact
• Occupied recirculation (if equipped)
–
Dry contact
• Unit fault
–
Dry contact
• Cooling override (if equipped)
–
Dry contact
• Dehumidification (if equipped)
–
Dry contact
• Heating override (if equipped)
–
Dry contact
• Supply blower high speed (if equipped)
–
Dry contact
• Exhaust blower high speed (if equipped)
–
Dry contact
• Modulating supply motor speed (if equipped)
–
0 to 10 VDC
• Modulating exhaust motor speed (if equipped)
–
0 to 10 VDC
Outputs
• Chilled water valve (field supplied)
–
0 to 10 VDC (direct acting)
• Hot water valve (field supplied)
–
0 to 10 VDC (direct acting)
• Remote condenser compressor section – stage one
(field supplied)
–
Dry contact
• Remove condenser compressor section – stage two
(field supplied)
–
Dry contact
• WSHP two-way water shut-off valve with on/off ac-
tuator (accessory or field supplied)
–
24 VAC terminals
Please note that the location of the field wiring (FW) ter-
minal and panel (PNL) terminal may vary depending upon
options selected. See Figure G3 for the two different loca-
tions within the electrical panel.
IMPORTANT
Terminal contacts are provided to open/close/modulate
the type of heating or cooling valves, contacts, etc. as
required, which are external to the unit and supplied by
others or available as shipped loose accessories for con-
nection to internal coils selected.
24 VAC−
24 VAC+
SUPPLY BLOWER MODULATING (SHIELD) (OPTIONAL)
EXHAUST BLOWER MODULATING (0–10 VDC+) (OPTIONAL)
SUPPLY BLOWER MODULATING (0–10 VDC−) (OPTIONAL)
SUPPLY BLOWER MODULATING (0–10 VDC+) (OPTIONAL)
DRY CONTACT
OUTPUTS
12A/125 VAC
10A/250 VAC
MOTORIZED WATER VALVE COM (24 VAC COM)
MOTORIZED WATER VALVE CLOSE (24 VAC)
MOTORIZED WATER VALVE OPEN (24 VAC)
EXHAUST BLOWER MODULATING (0–10 VDC−) (OPTIONAL)
EXHAUST BLOWER MODULATING (SHIELD) (OPTIONAL)
HOT WATER VALVE ACTUATOR (0–10 VDC−) (OPTIONAL)
HOT WATER VALVE ACTUATOR (0–10 VDC+) (OPTIONAL)
CHILLED WATER VALVE ACTUATOR (0–10 VDC−) (OPTIONAL)
CHILLED WATER VALVE ACTUATOR (0–10 VDC+) (OPTIONAL)
BACSTAT NET+
BACSTAT NET−
BACSTATII 24 VAC COM
BACSTATII 24 VAC+
OUTPUTS
FOR BACSTATII
DC3036
0–10 VDC OUTPUTS
20 mA MAX
CR
CR
CR
CR
CR
CR
CR
CR
CR
CR
CR
CR
UNOCCUPIED RECIRCULATION
CONTACT (OPTIONAL)
OCCUPANCY
CONTACT
OCCUPIED RECIRCULATION
CONTACT (OPTIONAL)
HEATING OVERRIDE
CONTACT (OPTIONAL)
LOW LIMIT
CONTACT
COOLING OVERRIDE
CONTACT (OPTIONAL)
DEHUMIDIFICATION
CONTACT (OPTIONAL)
EXHAUST BLOWER HIGH SPEED
CONTACT (OPTIONAL)
UNIT FAULT
CONTACT
SUPPLY BLOWER HIGH SPEED
CONTACT (OPTIONAL)
CONDENSER SECTION STAGE 2
OUTPUT CONTACT (OPTIONAL)
CONDENSER SECTION STAGE 1
OUTPUT CONTACT (OPTIONAL)
316
317
318
319
315
314
302
301
304
306
306
307
370
371
363
364
372
373
305
305
377
376
375
374
380
381
400
382
383
402
401
403
501
503
502
410
411
502-S
435
436
437
504-S
504
Figure G2: DDC controls
PNL
FW
PNL
FW
Figure G3: Terminal locations
VCES-VHC-IOM-1F – VHC-36, -42 & -50
43
