iO UT32 User manual

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TABLE OF CONTENTS
1
Introduction ............................................................................................................................................4
Getting Started .......................................................................................................................................5
Installing the Thermostat .....................................................................................................................6, 8
Disassembly ..........................................................................................................................6
Thermostat Location ..............................................................................................................6
Mounting the Subbase ........................................................................................................6, 7
Terminal Designations ............................................................................................................8
Setting the System Switches ..................................................................................................................9
System Switch Functions .....................................................................................................................10
Installing the Batteries ..........................................................................................................................11
Typical System Wiring Diagrams .....................................................................................................12, 20
Heat only (Gas) ....................................................................................................................12
Heat only (Electric)................................................................................................................13
Cool only (Single or Multi-stage) ...........................................................................................14
1 Heat / 1 Cool (Gas) .............................................................................................................15
2 Heat / 2 Cool (Gas) .............................................................................................................16
2 Heat / 1 Cool (Heat Pump) ..................................................................................................17
3 Heat / 2 Cool (Heat Pump) ..................................................................................................18

TABLE OF CONTENTS
2
TABLE OF CONTENTS
2 Heat / 1 Cool (Dual Fuel) ....................................................................................................19
3 Heat / 2 Cool (Dual Fuel) ....................................................................................................20
Installer Setup Menu ........................................................................................................................21,38
Entering the Setup Menu ......................................................................................................21
Selecting Programmable or Non-programmable Operation ..................................................22
Selecting Number of Program Events ...................................................................................23
Selecting Mode ....................................................................................................................24
Selecting Programmable Fan ...............................................................................................25
Assigning Auxiliary Contacts ................................................................................................26
Selecting Touchscreen Lock Options ....................................................................................27
Selecting the Cooling Setpoint Limit .....................................................................................28
Selecting the Heating Setpoint Limit .....................................................................................29
Selecting Back Light Option ..................................................................................................30
Selecting Adaptive Recovery Option ....................................................................................31
Selecting First Stage Heating and Cooling Differential Option ...............................................32
Selecting Second Stage Heating and Cooling Differential Option ..........................................33
Selecting Third Stage Heating Differential Option .................................................................34
Selecting Demand Staging or Locked Staging Option ...........................................................35
Sensor Calibration ...............................................................................................................36
Selecting Low Balance Point Option .....................................................................................37
Selecting High Balance Point Option ....................................................................................38

TABLE OF CONTENTS
3
Remote Sensor Installation .............................................................................................................39, 41
Remote Sensor Types ..........................................................................................................39
UT32-S2 Indoor Sensor Installation ................................................................................39, 40
UT32-OTS Outdoor Sensor Installation ...............................................................................40
Temperature/Resistance Chart ............................................................................................41
Display Functions .................................................................................................................................42
Testing ............................................................................................................................................43, 47
Fan Operation ......................................................................................................................43
Conventional Heating ...........................................................................................................43
Conventional Cooling .....................................................................................................43, 44
Conventional Heat Pump .....................................................................................................44
Dual Fuel ..............................................................................................................................45
Low Balance Point ..........................................................................................................45, 46
High Balance Point ...............................................................................................................46
Adaptive Recovery .........................................................................................................46, 47
Programmable Fan ..............................................................................................................47
Auxiliary Contacts ................................................................................................................47
Basic Troubleshooting ....................................................................................................................48, 49
Specifications .......................................................................................................................................50

INTRODUCTION
The UT32 is a feature-rich touchscreen thermostat that can be battery powered or hardwired to the
HVAC equipment. Using a common sense approach to the installation will ensure this product is
installed properly and to the customer’s satisfaction. Please take time to read and understand this
manual so that installation and testing is performed in an efficient manner.
This manual is to be used in conjunction with the supplied User Manual.
Although great care has been taken in the preparation of this manual, iO HVAC Controls takes
no responsibility for errors or omissions contained herein. It is the responsibility of the
installer to ensure that this thermostat and the equipment connected to it operate in a safe and
efficient manner.
Due to ongoing product improvements, iO HVAC Controls reserves the right to change the
specifications of the UT32 thermostat or its components without notice.
All rights reserved.
© iO HVAC Controls, LLC 2016.
Intellectual rights apply.
4

GETTING STARTED
As with any HVAC project, careful installation is the key to a successful outcome.
Time taken during the installation process will be rewarded with fewer call-backs.
The steps required to install the UT32 thermostat are as follows.
1. Read and understand this Installation Manual and User Manual.
2. Mount and wire the subbase.
3. Install the batteries.
4. Set the 4 system switches to match the equipment application.
5. Wire optional remote temperature sensor(s).
6. Power the thermostat
7. Set the Advanced Installer settings.
8. Test the thermostat.
5

INSTALLING THE THERMOSTAT
DISASSEMBLY
There are two release slots located on the bottom of the thermostat. Gently push
the flat blade of a small screwdriver into one slot at a time and pry upward until
the catch disengages. Carefully swing the thermostat upward and away from the
subbase. (Figure 1)
THERMOSTAT LOCATION
The UT32 should be installed in a location that
represents the ambient space temperature. Do not install
the thermostat in an area where drafts are present, near
the floor, behind doors or on an external wall. Avoid
placing the thermostat in areas where the air movement
is limited, affected by direct sunlight or other areas not
typical of the temperature in the space.
MOUNTING THE SUBBASE
When mounting the UT32 subbase, be aware that drafts may
travel down wall cavities and enter the back of the thermostat
through the control wire hole in the wall. It is important to seal
the hole to prevent any drafts that might affect the internal
temperature sensor.
FIGURE 1
6

INSTALLING THE THERMOSTAT
Pull the control wires through the large opening in the thermostat subbase. Next,
level and mount the subbase on the wall using the supplied anchors and screws.
(Figure 2)
Do not over tighten the mounting screws as the subbase may warp causing
the improper seating of the thermostat connecting pins to the terminal
blocks.
Use a properly sized
screwdriver and back each
screw terminal out (counter
clockwise) before landing each
wire to its dedicated terminal.
Do not over tighten the terminal
screws. Check to ensure that all
wires are landed correctly and
dressed properly to prevent any
shorts. Refer to Typical System
Wiring Diagrams in this manual
for proper wiring. FIGURE 2
7
S2 SC S1 O/B
AUX AUX
Y1 Y2 W1 GRC
iO HVAC Controls
www.iohvacsystems.com
WIRE
ACCESS
HOLE
BATTERY
COMPARTMENT
MOUNTING HOLES
MOUNTING HOLES
W2 MOUNTING
HOLE

INSTALLING THE THERMOSTAT
TERMINAL DESIGNATIONS
TERMINAL DESIGNATION
S2 Outdoor Sensor
SC Sensor Common
S1 Indoor Sensor
AUX Auxiliary Contacts
W2/OB Second Stage Heat or Reversing Valve
Y1 First Stage Cool or First Stage Compressor
Y2 Second Stage Cool or Second Stage Compressor
W1 First Stage Heat/Auxiliary/Emergency Heat
G Fan
R 24 VAC Hot
C 24 VAC Common
8

SETTING THE SYSTEM SWITCHES
The UT32 contains a set of four system switches located on the thermostat
printed circuit board. (Figure 3) The switches are used to match the thermostat
operation and relay outputs with the HVAC system requirements. Refer to the
system switch functions on the next page to properly configure the thermostat.
FIGURE 3
9
1 2 3 4
ON DIP
SYSTEM SWITCHES
. . . . .. . . . . ..

SYSTEM SWITCH FUNCTIONS
Switch 1 - Equipment Type Switch 1 sets the equipment type. For conventional
heat/cool equipment, set the switch to the OFF
position (factory default). For heat pump equipment set
the switch to the ON position.
Switch 2 - Fan or When Switch 1 is OFF
Reversing Valve For gas heat, set the switch to the OFF position
(factory default). For electric heat, set the switch to the
ON position.
When Switch 1 is ON
For ‘O’ reversing valve, set the switch to the OFF
position. (factory default) For ‘B’ reversing valve, set
the switch to the ON position.
Switch 3 - Equipment Stages Switch 3 sets the number of equipment stages.
OFF = 1 heat / 1 cool gas / electric or 2 heat / 1 cool
heat pump or dual fuel.
ON = 2 heat / 2 cool gas / electric or 3 heat / 2 cool
heat pump or dual fuel.
Switch 4 - Dual Fuel Mode For conventional heat pump equipment, leave
switch 4 in the OFF position (factory default). For
dual fuel equipment, set switch 4 to the ON position.
10

INSTALLING THE BATTERIES
The UT32 comes with two AA batteries. Even if the thermostat is hardwired,
battery backup is recommended to maintain the real-time clock in the event of a
power failure. All other memory is non-volatile in the event of battery or primary
power loss. Press in on the battery access compartment and slide the drawer out.
Install the two AA batteries matching the + and - orientation. Push the battery
compartment in until it clicks shut. When the batteries are properly installed, the
touchscreen display will light up. (Figure 4)
FIGURE 4
+
-
11

TYPICAL SYSTEM WIRING DIAGRAMS
HEAT ONLY (GAS)
Switch Settings
OFFSwitch 1 = Heat/Cool
Switch 2 = Equipment controls fan on call for heatOFF
Switch 3 = Single StageOFF
Switch 4 = Leave OFFOFF
12
SC S1 Y1 Y2 W1 G R C
FAN
RELAY LINE
24 V
W2
O/B
S2
OPTIONAL
REMOTE SENSOR
TERMINALS
THERMOSTAT
EQUIPMENT
OUTDOOR
SENSOR
INDOOR
SENSOR
HEAT 1
RELAY
AUX AUX

TYPICAL SYSTEM WIRING DIAGRAMS
HEAT ONLY (ELECTRIC)
Switch Settings
OFFSwitch 1 = Heat/Cool
Switch 2 = Thermostat controls fan on call for heatON
Switch 3 = Single StageOFF
Switch 4 = Leave OFFOFF
13
SC S1 Y1 Y2 W1 G R C
FAN
RELAY LINE
24 V
W2
O/B
S2
OPTIONAL
REMOTE SENSOR
TERMINALS
THERMOSTAT
EQUIPMENT
OUTDOOR
SENSOR
INDOOR
SENSOR
HEAT 1
RELAY
AUX AUX

TYPICAL SYSTEM WIRING DIAGRAMS
COOL ONLY (SINGLE OR MULTI-STAGE)
Switch Settings
OFFSwitch 1 = Heat/Cool
Switch 2 = Fan energized on call for coolingOFF
Switch 3 = = Single Stage = Multi-stageOFF/ON OFF ON
Switch 4 = Leave OFFOFF
14
SC S1 Y1 Y2 W1 G R C
FAN
RELAY LINE
24 V
W2
O/B
S2
OPTIONAL
REMOTE SENSOR
TERMINALS
THERMOSTAT
EQUIPMENT
OUTDOOR
SENSOR
INDOOR
SENSOR
COOL 1
RELAY
COOL 2
RELAY
AUX AUX

TYPICAL SYSTEM WIRING DIAGRAMS
1 HEAT / 1 COOL (GAS)
Switch Settings
OFFSwitch 1 = Heat/Cool
Switch 2 = Fan energized on call for coolingOFF
Switch 3 = Single StageOFF
Switch 4 = Leave OFFOFF
15
SC S1 Y1 Y2 W1 G R C
FAN
RELAY LINE
24 V
W2
O/B
S2
OPTIONAL
REMOTE SENSOR
TERMINALS
THERMOSTAT
EQUIPMENT
OUTDOOR
SENSOR
INDOOR
SENSOR
COOL 1
RELAY
HEAT 1
RELAY
AUX AUX

TYPICAL SYSTEM WIRING DIAGRAMS
2 HEAT / 2 COOL (GAS)
Switch Settings
OFFSwitch 1 = Heat/Cool
Switch 2 = Fan energized on call for coolingOFF
Switch 3 = Multi-stageON
Switch 4 = Leave OFFOFF
16
SC S1 Y1 Y2 W1 G R C
FAN
RELAY LINE
24 V
W2
O/B
S2
OPTIONAL
REMOTE SENSOR
TERMINALS
THERMOSTAT
EQUIPMENT
OUTDOOR
SENSOR
INDOOR
SENSOR
COOL 1
RELAY
HEAT 1
RELAY
HEAT 2
RELAY COOL 2
RELAY
AUX AUX

TYPICAL SYSTEM WIRING DIAGRAMS
2 HEAT / 1 COOL (HEAT PUMP)
Switch Settings
ONSwitch 1 = Heat Pump
Switch 2 = = ‘O’ = ‘B’OFF/ON OFF ON
Switch 3 = 2 Heat / 1 Cool HPOFF
Switch 4 = Leave OFFOFF
17
SC S1 Y1 Y2 W1 G R C
FAN
RELAY LINE
24 V
W2
O/B
S2
OPTIONAL
REMOTE SENSOR
TERMINALS
THERMOSTAT
EQUIPMENT
OUTDOOR
SENSOR
INDOOR
SENSOR
COMP 1
RELAY
AUX
RELAY
REV
VALVE
AUX AUX

TYPICAL SYSTEM WIRING DIAGRAMS
3 HEAT / 2 COOL (HEAT PUMP)
Switch Settings
ONSwitch 1 = Heat Pump
Switch 2 = = ‘O’ = ‘B’OFF/ON OFF ON
Switch 3 = 3 Heat / 2 Cool HPON
Switch 4 = Leave OFFOFF
18
SC S1 Y1 Y2 W1 G R C
FAN
RELAY LINE
24 V
W2
O/B
S2
OPTIONAL
REMOTE SENSOR
TERMINALS
THERMOSTAT
EQUIPMENT
OUTDOOR
SENSOR
INDOOR
SENSOR
COMP 1
RELAY
AUX
RELAY
REV
VALVE COMP 2
RELAY
AUX AUX

TYPICAL SYSTEM WIRING DIAGRAMS
2 HEAT / 1 COOL (DUAL FUEL)
Switch Settings
ONSwitch 1 = Heat Pump
Switch 2 = = ‘O’ = ‘B’ Reversing ValveOFF/ON OFF ON
Switch 3 = 2 Heat / 1Cool dual fuelOFF
Switch 4 = Locks out heat pump when furnace is energizedON
19
SC S1 Y1 Y2 W1 G R C
FAN
RELAY LINE
24 V
W2
O/B
S2
OPTIONAL
REMOTE SENSOR
TERMINALS
THERMOSTAT
EQUIPMENT
OUTDOOR
SENSOR
INDOOR
SENSOR
COMP 1
RELAY
AUX
RELAY
REV
VALVE
AUX AUX