Reznor SHH (Indoor PreevA) Unit Installation Manual - Manual (Page 58)

Form I-PDH/SDH/PEH/SHH/PXH, Page 58
Model PEH units with Option D12D have additional controls to provide electric heat
modulation. Depending on their size (amp draw), Model PEH units with Option D12D
are equipped with one or two SCR power controllers (See FIGURE 50).
To provide comfort level heating in response to the system controller, the SCR control-
lers cause modulation of specified heating elements while other elements are turned
on and off or staged. Depending on size, staging is controlled either by the FX06 con-
troller or an additional staging module.
Electric Heat Model
PEH with Option D12D
- Additional Modulation
Controls
8.3 Digital Controls
or Heating/
Cooling,
Makeup Air and
Dehumidification
(cont’d)
8.0 Controls and
Operation
(cont’d)
Option D12B - applies to PDH and SDH; PXH (no heat) - Control is factory pro-
grammed for electronic modulation gas heating, with 3-stage cooling, and with or with-
out optional dehumidification (reheat). Space reset control is optional.
Option D12C - applies to PDH and SDH; PXH (no heat) - Control can be factory pro-
grammed for two-stage gas heating, with 3-stage cooling, and with or without optional
dehumidification (reheat). Space reset control is optional
Option D12E - applies to PEH - Control is factory programmed with neutral air control
for 2-stage electric heat, with 3-stage cooling, and with or without optional dehumidi-
fication (reheat). Space reset control is optional. NOTE: Option D12D is not recom-
mended for makeup air applications.
Option D12D - applies to PEH - Control is factory programmed with recirculating
control for electric heat with SCR modulation, with 3-stage cooling, and with or without
optional dehumidification (reheat). Space reset control is optional.
Option D12F - applies to SHH - Control is factory programmed for 2-stage
recirculated heating / 3-stage cooling control. Heating is controlled by space
temperature. Cooling is also controlled by space temperature except when equipped
with a mixing box with economizer control (either Option GE21 or GE22). Option
D12F provides time schedule control and allows for the addition of expansion cards
to provide N2 or LON automated building control. ( NOTE: Makeup air application was
not available on Model SHH until 4/13 (Serial No. Date Code BMD).
Option D12G - applies to SHH - Control is factory programmed for electronic deep
modulation (8:1 turndown) gas heating and with 3-stage cooling control. Space reset
control is optional. ( NOTE: Makeup air application was not available on Model SHH
until 4/13/Serial No. Date Code BMD.)
Digital (FX06) Control
Applications by Option
Code
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 (cont’d)
START
Unit On/OFF
Switch
Mode Controlled by:
Internal Time Clock or
Occ/Unocc Switch
Blower: Intermittent
ON call for space H or C
OR Space Humidity
Control
Setpoints
SSP - HSO - SHP - NSB
= 59.2°F
Discharge Air Setpoint
RHP = 80°F
Blower: Continuous
Damper 100% Open or
Other Control
Heat or Cool Neutral Air
Discharge Air Setpoint
DHL, DCH = 70°F
Heating Neutral Air
Discharge Air
Setpoint
DHL = 70°F
Space Heating
SHP = 68.2°F
Discharge Air
Setpoint
RHP = 80°F
Dehumidification
Allowed
Enable DP1 = 60°F
Space Humidistat Switch
Closed; High and Low
Ambient Lockout
Heating Or Cooling Mode
Cooling, OAT > 68°F (OC1)
Heating, OAT < 62°F (OH1)
Occupied
Mode:
Unoccupied
Mode:
Damper(s): Open or
Other Control
Discharge Air Setpoint
Space Heating
Space Cooling
Neutral Air
Heating
Space Cooling
SSP + SCP =
76.8°F
Discharge Air
Setpoint
RCP = 55°F
Cooling Neutral
Air
Discharge Air
Setpoint
DCH = 70°F
Discharge Air Setpoint
Space Cooling
Neutral Air
Space Cooling
SSP + SCP =
76.8°F
Discharge Air
Setpoint
RCP = 55°F
Dehumidification
Not Allowed
Cooling
Heating Or Cooling Mode
Cooling, OAT > 68°F (OC1)
Heating, OAT < 62°F (OH1)
Space Humidistat Switch Closed
Space Cooling
Setpoints
SSP + SCP + NSU =
85.8°F
Discharge Air Setpoint
RCP = 55°F
Dehumidification
Allowed
Enable DP1 = 60°F
And RHE = Enable
Space Humidistat
Switch Closed
Dehumidification
Not Allowed
SSP - HSO -
Space Heating