Reznor SHH (Indoor PreevA) Unit Installation Manual - Manual (Page 57)

Form I-PDH/SDH/PEH/SHH/PXH, Page 57
FIGURE 49 - FX06
Programmable
Controller in D12B,
D12C, D12D, D12E,
D12F, and D12G
8.3.2 Optional Digital Heating/Cooling/Dehumidification (Reheat)
Controls, Options D12B, D12C, D12D, D12E, D12F, D12G -
applies to SDH, PDH, SHH, PEH, or PXH - required with all
dehumidification, Option AU7
The programmable controller ( FIGURE 49) used with these options has a built-in time
clock card for energy savings and better management of the specific application. If
equipped with the optional serial communication card, the controller is compatible with
either the LON or N2open BAS protocol.
If your unit was ordered with either Option D12B, D12C, D12D, D12E, D12F, or D12G,
refer to Form CP-PREEVA-D12 B/C/D/E/F/G in the Literature Bag, for more detailed
information.
The microprocessor unit (Model FX06) in control Options D12B, D12C, D12D, D12E,
D12F, or D12G is custom programmed for the following:
• Custom 3-step control sequence of cooling and dehumidification (reheat)
• Modulation or 2-stage gas heat control
• SCR control or two stage electric heat
• Fully integrated outdoor ambient lockouts based on outdoor dry bulb/
dewpoint or enthalpy
• Alarm and equipment shutdown features
• Service/Commissioning Test Mode
• Integrated timer functions for cooling and heating
There are four buttons that can be used for adjusting setpoints, viewing unit status, and
enabling unit test or shutdown modes. The controller display will indicate unit status
(on, off, or alarm), discharge air temperature, outdoor air temperature, dewpoint, and
enthalpy. When equipped with a wall-mounted sensor (Option CL67), space tempera-
ture will be displayed.
When the unit is called to operate, the main blower will run continuously in occupied
mode and intermittently in unoccupied mode. The unit operates based on the four Dis-
charge Air Temperature Setpoints listed below:
1. Standard (Neutral) Heating Discharge Air Temperature Setpoint
2. Space Heating Discharge Air Temperature Setpoint
3. Standard (Neutral) Cooling Discharge Air Temperature Setpoint
4. Space Cooling Discharge Air Temperature Setpoint
The heating and cooling equipment will cycle to maintain the active discharge air tem-
perature setpoint for occupied and unoccupied modes. Heating and cooling may be
locked out of operation based upon outdoor air temperature and enthalpy conditions.
If equipped with reheat, the control will also activate the dehumidification circuit to
maintain a neutral discharge air temperature setpoint and related dewpoint based
upon outdoor air and space conditions.
Reference: For
explanation on the
settings and functions of
the FX06 programmable
control, see the
instruction form in the
Literature Bag (Form
CP-PREEVA-D12 B/C/D/
E/F/G). If equipped with
a special control such
as FX07, contact your
distributor or the factory
for additional information.