Greenheck Vari-Green Control - Indoor Air Quality - Temp/Humidity (475573) - Manual (Page 5)

5
Programming (J19 = PRG)
The unit shall ship with factory default parameter
setpoints. Parameter setpoints may be edited in
the field by HVAC technicians. During parameter
editing, the output voltage shall be set to zero.
General Programming
• Enter the edit mode by removing
the unit from its base and
placing jumper J19 on the PRG
pins. The minor display shall
show the parameter name and the major display
shall show the parameter number.
• Press the UP or DN switch to select the
parameter you wish to edit.
• Press the ENT switch to select the parameter and
enter the parameter edit mode. The minor display
shall show the parameter name and the major
display shall show the parameter value.
• Press the UP or DN switch to change the
parameter value. Pressing and holding the
switch will scroll through the values.
• If a parameter has more than one sub-menu (see
tables pgs 6-7), press the ENT switch to reach
the 1st sub-menu and edit the parameter, then
push the ENT switch to reach the 2nd sub-menu
and edit the parameter. Continue until all sub-
menus are edited. Pushing the ENT switch once
more will save and return to the parameter menu.
• Return to normal operation by placing jumper J19
on a single pin.
Parameter Descriptions
Temperature Control, Parameter P0
Factory Defaults = On, COOL, Setpoint 72°F
TMP OFF = Temperature control Off
TMP On = Temperature control On
ACT COOL = Cool Mode, operate fan to lower temp
ACT HEAt = Heat Mode, operate fan to raise temp
SP°F # = Temp Setpoint, 15° to 130°F in 1° increments
SP°C # = Temp Setpoint, -10° to 55°C in 0.5° increments
(°C or °F Temp Setpoint is defined by P1 below)
Temperature Units, Parameter P1
Factory Default = F
DEG F = Fahrenheit degrees
DEG C = Celsius degrees
Humidity Control, Parameter P2
Factory Defaults = OFF, Humidity Setpoint 50%RH
HMD OFF = Humidity control off
HMD On = Humidity control on,
operate fan to decrease humidity
%HSP # = Humidity Setpoint,
0 to 100%RH in 1% increments
Restore Factory Default Parameter
Values, Parameter P3
Factory Default = OFF
FAC OFF = Entry screen, leave current values
FAC On = Restore factory values
Display Format, Parameter P4
Factory Default = run
DIS OFF = Turn minor and major displays off, leave
control mode and fan icons on.
DIS FAn = Unit shows fan speed until scroll button
pushed
DIS run = Unit shows temp or humidity values in
temp or humidity control. Unit toggles
between temp and humidity if both
control modes are enabled.
Fan Cutout Timer, Parameter P5
Factory Default = OFF, 30 seconds
CUT OFF = Cutout timer off
CUT On = Cutout timer on
CTM # = Cutout time, 0 to 300 secs in 1 sec increments
The cutout function turns off the fan when the
temperature and humidity are below their setpoints
for a predetermined amount of time.
Cutout Disabled
The algorithm is run and the FAN output is always
between the min and max speed (Parameters P8 & P9).
Cutout Enabled
When the temp and humidity are below setpoint,
the cutout timer is started and the dot icon on the
display starts flashing. If the timer runs out before
the temp and humidity raises above setpoint, then
the FAN output is set to zero, the dot icon is on
steady and the fan icon is turned off. If the temp and
humidity rises above setpoint (1°F or 3%RH), then
the dot turns off, the fan icon is illuminated and the
FAN resumes algorithm control. The Scroll Button
behaves normally during cutout.
Fan Override, Parameter P6
Factory Default = 100% Fan Speed
%OVR # = Fan Speed of 20 to 100% in 1% increments
During normal operation, when the remote override
switch is closed, the fan will immediately ramp to
P6 speed and stay there until the remote override
switch is opened. The override can be activated by
any normally-open, voltage-free contact. Closing the
contact will activate the override. The fan icon shall turn
on and the display will show %OVR and the %Speed.
Manual Fan Speed Override, Parameter P7
Factory Defaults = OFF, 50% Manual Fan Speed
SPD OFF = Algorithm control
SPD On = Manual control
%SPD # = 20% to 100% in 1% increments, or 0%
J19 Edit Mode