Table Of Contents; Sequence Of Operation; General Operation - Greenheck 474706 Reference Manual

Table of Contents

Sequence of Operation . . . . . . . . . . . . . . . 2
General Operation . . . . . . . . . . . . . . . . 2
Set Point Control . . . . . . . . . . . . . . . . . 3
Heating . . . . . . . . . . . . . . . . . . . . . . 3
Cooling . . . . . . . . . . . . . . . . . . . . . . 3
Dehumidification . . . . . . . . . . . . . . . . . 3
Reheat . . . . . . . . . . . . . . . . . . . . . . . 3
Alarms . . . . . . . . . . . . . . . . . . . . . . . 4
Energy Recovery Wheel Sequences . . . . . . . 6
Controller Overview . . . . . . . . . . . . . . . . . 5
Display Use . . . . . . . . . . . . . . . . . . . . . 6
Example of Parameter Adjustment . . . . . . . . . 6
Example of Alarms . . . . . . . . . . . . . . . . . 7
Main Menu Overview . . . . . . . . . . . . . . . 8-9
Menu Overview . . . . . . . . . . . . . . . . . 10-11
Menus
A. On/Off Unit . . . . . . . . . . . . . . . . . 12
B. Setpoint . . . . . . . . . . . . . . . . 12-13
C. Clock/Scheduler . . . . . . . . . . . . . . 15
D. Input/Output . . . . . . . . . . . . . . . . 15
E. Data Logger . . . . . . . . . . . . . . . . 15
F. Board Switch . . . . . . . . . . . . . . . 16
G. Service
a. Information . . . . . . . . . . . . . . . . 16
b. Overrides . . . . . . . . . . . . . . . 16-18
c. BMS Config . . . . . . . . . . . . . . 18-20
d. Service Settings . . . . . . . . . . . . . 20
a. Working hour set. . . . . . . . . . . . 20
b. Probe adjustment . . . . . . . . . . . 20
c. Password/Defaults . . . . . . . . . . 20
H.
Manufacturer
a. Configuration . . . . . . . . . . . . . . . 21
b. I/O Configuration . . . . . . . . . . . . . 21
c. Factory Settings . . . . . . . . . . . 21-25
d. Initialization . . . . . . . . . . . . . . . . 25
Points List . . . . . . . . . . . . . . . . . . . . . . 26
Auxiliary I/O (pCOe) . . . . . . . . . . . . . . . . . 27
Setup. . . . . . . . . . . . . . . . . . . . . . . . . 27
Troubleshooting . . . . . . . . . . . . . . . . . . . 28
NTC Temperature Sensor Chart . . . . . . . . . . 28
BACnet MSTP Quick Start . . . . . . . . . . . . . 29
BACnet IP/Eth Quick Start . . . . . . . . . . . . .30
Maintenance Log . . . . . . . . . . . . . . . . . . 31
Warranty . . . . . . . . . . . . . . . . . . Backcover
2
DDC Controller for Tempered Air Products

Sequence of Operation

The DDC controller can be configured for air handler,
energy recovery and make-up air applications. Each
application utilizes similar technologies for heating
and cooling: chilled water, hot water, indirect gas,
electric heat, packaged DX cooling, and packaged
DX cooling with digital scrolls. All set points, lockouts
and delays are user adjustable.

General Operation

UNIT START COMMAND: The DDC controller
requires a digital input to enable operation. The unit
can then be commanded on or off by this digital
input, the BMS or internal time clock.
• Initial delay
• F actory mounted and wired dampers are powered,
if equipped. (Outdoor air, exhaust air, and
recirculation air dampers).
• E xhaust fan starts after a 10 second delay, if
equipped.
• Supply fan starts 5 seconds after the exhaust fan.
• Heating, cooling and wheel operation (page 3).
UNIT STOP COMMAND (OR DE-ENERGIZED):
• S upply fan, exhaust fan, tempering, and wheel are
de-energized.
• O utdoor air and Exhaust air damper dampers are
closed after a 10 second delay.
OCCUPIED/UNOCCUPIED MODES: The DDC
controller offers three modes of determining
occupancy: a dry contact, the internal time clock or
the BMS. When in the unoccupied mode, the unit will
either be shut down, or will cycle on to maintain the
unoccupied room temperature set point.
• Occupied Mode:
- Exhaust fan on, if equipped.
- Supply fan on.
- Heating (refer to Heating section).
- Cooling (refer to Cooling section).
- Wheel control (page 4), if equipped.
• U noccupied Mode (Unit Off): Default setting
when there is no recirculation damper or room
temperature sensor.
• U noccupied Mode (Cycle on Room): Optional
unoccupied mode when there is a recirculation
damper and a room temperature sensor wired to
unit.
- Exhaust fan off, if equipped.
- Supply fan off.
- Recirculation air damper open.
- OA damper closed.
- Unoccupied heating is enabled when the
room temperature is less than the unoccupied
heating set point minus differential (65°F±5°F).
The supply air temperature set point will be
set to the supply maximum reset limit (90°F).
The unit cycles off when the room temperature
reaches the unoccupied heating set point plus
differential.
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