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PN 475573
Vari-Green® Control
Indoor Air Quality–Temp/Humidity
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble,
install, operate or maintain the product described. Protect yourself and others by observing all safety
information. Failure to comply with instructions could result in personal injury and/or property damage!
Temperature and Humidity Controller
The Temperature and Humidity Controller is
specically designed to control a Vari-Green fan
motor. The Temperature and Humidity Controller
will sense the temperature and humidity in the
space and will automatically adjust the speed of
a supply or exhaust fan to adjust the ventilation
rate accordingly. The temperature measurement
will be compared to a eld adjustable temperature
setpoint, processed through a Proportional/Integral/
Derivative (PID) control algorithm to produce a 2
to 10 VDC fan motor control output. The humidity
measurement will be compared to a eld adjustable
humidity setpoint, processed through a PID control
algorithm to produce a 2 to 10 VDC fan motor
control output. If the unit is in temperature only
mode the temperature algorithm’s output shall be
used to provide the fan motor control output. When
the unit is in humidity-only mode the humidity
algorithm’s output shall be used to provide the
fan motor control output. When the unit is in
temperature and humidity mode the algorithm with
the greatest output shall be used to provide the fan
motor control output.
When all active algorithms are satised, the output
voltage shall be set to its lowest value, 2 VDC. If
the temperature is 1°F below the temperature
setpoint in
temperature control
and the humidity
is 3% below the
humidity setpoint in
humidity control or
both in temperature
and humidity control,
the voltage output
may be set to zero
(optional cutout
mode). The unit
will resume normal
fan operation if
the temperature
changes by 1°F or
the humidity changes by 5%.
Ventilating based on the temperature and humidity
measurements assures that the space will not be
over or under ventilated while using the Vari-Green
motor technology to operate quietly and efciently.
The Temperature and Humidity Controller has
adjustments for setpoint, minimum and maximum
fan speed. The fan speed and temperature or
humidity level are available as an analog output to
be read by a building
General Safety Information
Only qualied personnel should install this product.
Personnel should have a clear understanding of
these instructions and should be aware of general
safety precautions. Improper installation can result
in electric shock, possible injury due to coming in
contact with moving parts, as well as other potential
hazards. Other considerations may be required
if high winds or seismic activity are present. If
more information is needed, contact a licensed
professional engineer before moving forward.
DANGER
Always disconnect, lock and tag power source before
installing or servicing. Failure to disconnect power
source can result in re, shock or serious injury.
CAUTION
When servicing the fan, motor may be hot enough
to cause pain or injury. Allow motor to cool before
servicing.
CAUTION
Precaution should be taken in explosive
atmospheres.
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Electrical Safety Information
Follow all local electrical and safety codes, as well
as the National Electrical Code (NEC) and the
National Fire Protection Agency (NFPA). Where
applicable, follow the Canadian Electric Code.
1. The rotation of the wheel is critical. It must be
free to rotate without striking or rubbing any
stationary objects.
2. Motor must be securely and adequately
grounded.
3. Do not spin fan wheel faster than maximum
cataloged fan RPM. Adjustment to fan speed
signicantly affects motor load. If fan RPM is
changed, motor current should be checked
to make sure it is not exceeding the motor
nameplate amps.
4. Do not allow the power cable to kink or come
in contact with oil, grease, hot surfaces,
or chemicals. Replace cord immediately if
damaged.
5. Verify that the power source is compatible with
the equipment.
6. Never open access doors to a duct while the fan
is running.
Receiving
Upon receiving the product check to make sure all
items are accounted for by referencing the bill of
lading to ensure all items were received. Inspect
each crate for shipping damage before accepting
delivery. Notify the carrier if any damage is noticed.
The carrier will make notication on the delivery
receipt acknowledging any damage to the product.
All damage should be noted on all the copies of the
bill of lading which is countersigned by the delivering
carrier. A Carrier Inspection Report should be lled
out by the carrier upon arrival and reported to the
Trafc Department. If damaged upon arrival, le
a claim with carrier. Any physical damage to the
unit after acceptance is not the responsibility of
Greenheck Fan Corporation.
Unpacking
Verify that all required parts and the correct quantity
of each item have been received. If any items are
missing, report shortages to your local representative
to arrange for obtaining missing parts. Sometimes it
is not possible that all items for the unit be shipped
together due to availability of transportation and truck
space. Conrmation of shipment(s) must be limited to
only items on the bill of lading.
Electrical
The motor amperage and voltage ratings must be
checked for compatibility to supply voltage prior
to nal electrical connection. Wiring must conform
to local and national codes. Consult local code
authorities for specic requirements.
Storage
Product is protected against damage during
shipment. If the product cannot be installed and
operated immediately, precautions need to be
taken to prevent deterioration of the product during
storage. The user assumes responsibility of the
product and accessories while in storage. The
manufacturer will not be responsible for damage
during storage. These suggestions are provided
solely as a convenience to the user.
Indoor Only
Do not store this product outdoors. The ideal
environment for the storage of this product is
indoors, above grade, in a low humidity atmosphere
which is sealed to prevent the entry of blowing
dust, rain or snow. Temperatures should be evenly
maintained between 30° to 110°F (-1° to 43°C) (wide
temperature swings may cause condensation and
“sweating” of metal parts). All accessories must be
stored indoors in a clean, dry atmosphere.
Remove any accumulations of dirt, water, ice, or
snow and wipe dry before moving to indoor storage.
Allow cold parts to reach room temperature to avoid
“sweating” of metal parts. To dry parts and packages,
use a portable electric heater to get rid of any moisture
buildup. Leave coverings loose to permit air circulation
and to allow for periodic inspection. The unit should
not be stored on the oor.
Inspection and Maintenance
During Storage
While in storage, inspect product once per month.
Keep a record of inspection and maintenance
performed. If moisture or dirt accumulations are found
on parts, the source should be located and eliminated.
Installation and Setup Guide
This guide provides instructions for how to
install, wire and program the control system for
use when constant pressure in a duct or room
system is required. This does not cover ductwork
recommendations or other considerations.
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Mounting
Mount the controller in the space to be controlled.
Keep wire lengths between the controller and the fan
to 200 feet or less.
Drywall Mounting
Mounting Plate
Junction Box Mounting
Electrical Box
Mounting Plate
Cover
1. Separate the unit from the back plate by driving
in the Allen screw until the two pieces come free.
2. Pull the wire through the wall and out of the
junction box, leaving about six inches free.
3. Pull the wire through the hole in the base plate.
4. Secure the plate to the box using the #6-32 x 5/8
inch mounting screws provided.
5. Terminate the unit wiring.
6. Mold the foam on the unit’s base to the wire
bundle to prevent drafts. (see note below)
7.
Attach Cover by latching it to the top of the base,
rotating the cover down and snapping it into place.
8. Secure the cover by backing out the lock-down
screw using a 1/16 inch Allen wrench until it is
ush with the bottom of the cover.
Cover
1. Separate the unit from the back plate by driving
in the Allen screw until the two pieces come free.
2. Place the base plate against the wall where you
want to mount the sensor.
3. Using a pencil mark out the two mounting holes
and the area where the wires will come through
the wall.
4. Drill two 3/16 inch holes in the center of each
marked mounting hole, DO NOT punch the
holes or the drywall anchors will not hold. Insert
a drywall anchor into each hole.
5. Drill one 1/2 inch hole in the middle of the
marked wiring area.
6. Pull the wire through the wall and out of the 1/2
Inch hole, leaving about six inches free.
7. Pull the wire through the hole in the base plate.
8. Secure the base to the drywall anchors using the
#6 x 1 inch mounting screws provided.
9. Terminate the unit wiring.
10. Mold the foam on the unit’s base to the wire
bundle to prevent drafts. (see note below)
11.
Attach cover by latching it to the top of the base,
rotating the cover down and snapping it into place.
12. Secure the cover by backing out the lock-down
screw using a 1/16 inch Allen wrench until it is
ush with the bottom of the cover.
NOTE: In any wall-mount application, the air
within the wall cavity can cause erroneous
readings. The mixing of room air and air from
within the wall cavity can lead to condensation,
erroneous readings and sensor failure.
To prevent these conditions, Greenheck
recommends sealing the conduit leading to
the junction box, lling the junction box with
berglass insulation or sealing the wall cavity.
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J15-24V 24V
Wiring
All wiring for the Greenheck Temperature and
Humidity Controller is Class II low-voltage control
wiring. See the Wiring Diagram on Page 7 for the
wiring overview.
Main Display 0.76
inch 4-digit Numeric
Minor Display
0.34 inch 3-digit
Alpha-Numeric
Heat Control
Icon
Control box to factory mounted
transformer control input.
Controller
Terminal
Transformer
Control Terminal
J15-FAN 0 to 10V
J15-GND COM
Optional Remote Override
Connect a normally-open switch between terminals
J17-OVR and J15-GND on the controller. Closing
this switch will activate the remote override feature.
Opening the switch will de-activate the override.
Optional Output Reference
A 0 to 10VDC signal is available from J15-REF to
J15-GND. The signal is 15° to 130° F (-10° to 55°C)
or 0 to 100% Relative Humidity depending on the
value of parameter P10 (see pg 6).
Cool Control
Icon
Dot
Fan ON Icon
Display Features
The minor display is used to describe the units
displayed and the main display shows the numeric
value. The fan icon is illuminated whenever the fan
output voltage is at or above the minimum specied
in parameter P8, Minimum % Fan Speed. The Cool
and Heat Icons are illuminated in each control mode
respectively. The dot in the lower left is used to
signal fan cut-out mode.
Normal Operation (J19 = RUN)
The Greenheck Indoor Air Quality – Temperature/
Humidity Controller ships with the following factory
setting: Cooling Control, Temperature Setpoint 72°F,
Fan Control output at 2 to 10 Volts and Cut-Out
Disabled. Pressing the scroll button at any time
shows the Temperature setpoint, a second push
shows the fan speed in percent.
Scroll
Button
Programming
Switches
Programming
Jumper in
RUN Mode
User Interface
A scroll button protrudes through the case. The
programming switches and programming jumper are
inside the case.
The scroll button will change the display momentarily
to view other information such as setpoints and fan
speed. These are for reference only, and cannot
be adjusted. The exact sequence will depend on
the settings of parameters P0, P1, P2 and P4. For
examples, see the two gures below.
Scroll Button
Sequence,
Temperature
Control
Cooling Mode,
°F Temperature
and Display in
run.
Scroll Button Sequence,
Temperature & Humidity Control
Cooling Mode, °F Temperature
and Display in run.
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Programming (J19 = PRG)
The unit shall ship with factory default parameter
setpoints. Parameter setpoints may be edited in
the eld 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 submenus 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.
J19 Edit Mode
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 dened by P1 below)
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 ashing. 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
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
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%
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on control mode
Parameter P7 continued....
Allows manual control of the fan speed for system
setup and commissioning tests. Exiting this
parameter returns the controller to normal operation.
When entering this parameter, the value shall be
OFF (normal operation). Press the UP button to set
the parameter value to On and then press the ENT
button. The unit is now in manual control.
The major display shall read 50 for 50% output (5
VDC out). The minor display shall show %SPD.
Pressing the UP button shall increase the displayed
value and proportionally change the fan speed.
Pressing the DN button shall decrease the displayed
value and proportionally change the fan speed.
Allowed values are 0% and 20 to 100%, for 0 VDC
and 2 to 10 VDC fan motor control voltage.
The fan speed will remain at the displayed value
until the ENT button is pressed placing the unit back
to the parameter selection mode.
Minimum Fan Speed, Parameter P8
Factory Default = 20%
Parameter P8 continued...
%MIN # = 20% to 100% in 1% increments
Sets the min fan speed that the controller may
control to. Note: the controller will not allow the
output min to be set higher than the output max.
Maximum Fan Speed, Parameter P9
Factory Default = 100%
%MAX # = 20% to 100% in 1% increments
Sets the max fan speed that the controller may
control to. Note: the controller will not allow the
output max to be set lower than the output min.
Analog Output Reference, Parameter P10
Factory Default = Temperature
REF H = Humidity, 0 to 10V for 0 to 100%RH
REF t = Temperature,
0 to 10V for 15° to 130°F (-10° to 55°C)
An analog output across J15 terminals “REF” and
“GND” for the measured temp or humidity.
Parameter Menu Sub-Menu 1 Sub-Menu 2 Sub-Menu 3 Description Factory Default
Page 0, Temperature Control
Temperature Control Off
Temperature Control On ON
Cooling Mode, moving cooling air to space COOL
Heating Mode, moving heating air to space
Temperature Setpoint in Degrees Fahrenheit, 15°
to 130°, by 1°, Units Controlled by P1
Temperature Setpoint in Degrees Celsius, -10° to
55°, by 0.5°, Units Controlled by P1
Page 1, Temperature Units
Fahrenheit Degrees F
Celsius Degrees
Page 2, Humidity Control
Humidity Control Off OFF
Humidity Control On
Humidity Setpoint, 0 to 100 %RH by 1 %RH 50%
72°F
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Page 3, Restore Factory Default Menu Values
Entry Screen, Leave Current Values OFF
Restore Factory Values
Page 4, Display Format
Turn Minor and Major Display Off, Mode Icons On
Show % Fan Speed
Show Space Temperature and Humidity, Depends
run
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Parameter Menu Sub-Menu 1 Sub-Menu 2 Sub-Menu 3 Description Factory Default
Parameter Menu Sub-Menu 1 Sub-Menu 2 Sub-Menu 3 Description Factory Default
Page 0, Temperature Control
Temperature Control Off
Temperature Control On ON
Cooling Mode, moving cooling air to space COOL
Heating Mode, moving heating air to space
Temperature Setpoint in Degrees Fahrenheit, 15°
to 130°, by 1°, Units Controlled by P1
72°F
Temperature Setpoint in Degrees Celsius, -10° to
55°, by 0.5°, Units Controlled by P1
Page 1, Temperature Units
Fahrenheit Degrees F
Celsius Degrees
Page 2, Humidity Control
Humidity Control Off OFF
Humidity Control On
Humidity Setpoint, 0 to 100 %RH by 1 %RH 50%
Page 3, Restore Factory Default Menu Values
Entry Screen, Leave Current Values OFF
Restore Factory Values
Page 4, Display Format
Turn Minor and Major Display Off, Mode Icons On
Show % Fan Speed
Show Space Temperature and Humidity, Depends
on control mode
run
Minimum % Fan Speed Value, 20% to 100% in 1%
increments
Page 5, Fan Cutout Timer
Fan Cutout Off OFF
Fan Cutout On
Cutout Timer, 0 to 300 seconds 30
Page 6, Override % Fan Speed
20% to 100% Fan Speed, by 1% 100
Page 7, Manual Fan Speed Override
Manual Fan Speed Override Off OFF
Manual Fan Speed Override On
Manually Set Fan Speed, 20% to 100% in 1%
increments or 0%
Page 8, Minimum % Fan Speed
Page 9, Maximum % Fan Speed
Maximum % Fan Speed Value, 20% to 100% in
1% increments
Page 10, Analog Output Reference
50
20
100
Wiring Diagram
0 to 100 %RH, for 0 to 10 VDC
15° to 130°F or -10° to 55°C, for 0 to 10 VDC,
Units Controlled by P1
t
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Fan always at minimum speed
Blow into the bottom of the unit. Your breath should increase the humidity
Check that the temperature and humidity measurements are decreasing.
Setpoint may be incorrect for the persistent load.
Setpoint may be incorrect for the persistent load.
If the controller will not turn the fan off, verify that the measured temperature is at
Verify that the cutout timer has started by looking for the flashing dot.
If the controller will not restart the fan, verify that the measured temperature is at
Fan always at high speed
Fan Cutout not working properly
Troubleshooting
Problem
Potential Solution
measurement and raise the temperature measurement. The fan speed should
increase within a few minutes.
least 0.9°F below and the relative humidity is at least 3% below set point.
least 1°F above the setpoint and the relative humidity is at least 5% above the
setpoint.
Warranty
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of
one year from the shipment date. Any units or parts which prove defective during the warranty period will
be replaced at our option when returned to our factory, transportation prepaid. Motors are warranted by
the motor manufacturer for a period of one year. Should motors furnished by Greenheck prove defective
during this period, they should be returned to the nearest authorized motor service station. Greenheck
will not be responsible for any removal or installation costs.
As a result of our commitment to continuous improvement, Greenheck reserves the right to change
specications without notice.
Greenheck Vari-Green® Motor catalog provides additional
information describing the equipment, fan performance,
available accessories, and specication data.
Phone: (715) 359-6171 • Fax: (715) 355-2399 • E-mail: gfcinfo@greenheck.com • Web site: www.greenheck.com
475573 • Indoor Air Quality - Temp/Humidity, Rev. 1, June 2012
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AMCA Publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans, provides additional safety information. This publication can be obtained
from AMCA International, Inc. at: www.amca.org.
Copyright 2012 © Greenheck Fan Corporation
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