Peco TH170 User manual

TH170 HEAT PUMP THERMOSTAT
READ THESE INSTRUCTIONS CAREFULLY BE-
FORE ATTEMPTING TO INSTALL, OPERATE OR
SERVICE THIS THERMOSTAT.
Failure to observe safety information and comply
with instructions could result in PERSONAL INJURY,
DEATH AND/OR PROPERTY DAMAGE.
To avoid electrical shock or damage to equipment,
disconnect power before installing or servicing and
use only wiring with insulation rated for full thermo-
stat operating voltage.
Before installing this control, the Voltage Selection
Switch must be placed in the correct position. See
instructions.
To avoid potential re and/or explosion do not use in
potentially ammable or explosive atmospheres.
Retain these instructions for future reference. This
product, when installed, will be part of an engi-
neered system whose specications and perfor-
mance characteristics are not designed or controlled
by PECO. You must review your application and
national and local codes to assure that your installa-
tion will be functional and safe.
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WARNING
Use copper wire only, insulate or wire nut all unused
leads.
Care should be used to avoid electrostatic discharge
to the T170 thermostat.
This unit has conguration jumpers. You may need
to recongure this thermostat for your application.
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CAUTION
PREINSTALLATION CONSIDERATIONS
Thermostat Location – The thermostat should be used indoors only. It
should be mounted on an inner wall 48” from the oor, in a location with
freely circulating air, and where it will be responsive to changes in room
temperature. Avoid mounting near heat generating appliances (i.e. TV,
heater, refrigerator), or in direct sunlight.
Humidiers – The humidify output connects directly to 24VAC oper-
ated humidiers. No other connection or interlock is required. Several
installer-selectable operating modes are available as described in the
Humidity Control Operation Section.
Dehumidiers – The dehumidify output connects to the dehumidify input
on variable–speed furnaces and fan coils. Additional dehumidication is
done by controlling the compressor. Several installer-selectable operat-
ing modes are available as described in the Humidity Control Operation
Section.
Outdoor Temperature Sensor – The use of an outdoor temperature in
conjunction with the TH170 will improve the performance and increase
the number of humidity control modes available to the installer. Run two
wires from the TH170 to an outdoor location. The outdoor sensor can be
mounted to the outdoor unit and existing control wires may be used for
its connection.
APPLICATIONS AND FEATURES
Heat Pump Thermostat for 24 VAC Applications
Up to 3 Heat and 2 Cool Stages
System Selection: Off-Heat-Cool-Auto-Setback-Aux Heat
Up to 2 Fan Stages: On-Auto (1 fan), Hi-Low-Auto (2 fans)
Dehumidication/Humidity Control*
Setback and Off-Override Capable
Also Congurable With
Outdoor Air Sensors
Remote Probes
Occupancy Control Systems
Outside Air Ecomomizer (Damper Control)
*Available on the TH170-002 model only.
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SPECIFICATIONS
Temperature Set Point Range 50 to 90°F / 10 to 32°C
RH Set Point Range Humidity: 20-45% RH, Dehumidication: 50-90% RH
Electrical Rating 24 VAC Input, 24 VAC Output, Hardwired
Memory – Back-Up EEPROM, No batteries required, Stores settings for unlimited time.
Mounting Installs on standard 4” x 4” device box with a 2” x 4” horizontal mud ring
Humidity Accuracy +/- 3% RH
Storage Temperature Range -20 to 130°F
Physical Dimensions 4.4”H x 5.8”W x 1.1”D
Agency Approvals UL, UL Canada
© COPYRIGHT 2008 PECO, INC. ALL RIGHTS RESERVED. P/N 69290 3220-2088 REV 0 PAGE 1

© COPYRIGHT 2008PECO, INC. ALL RIGHTS RESERVED. P/N 69290 3220-2088 REV 0 PAGE 2
INSTALLATION
Remove Old Thermostat
Turn off power to thermostat at main fuse or circuit breaker box.
Ensure that ALL power is disconnected. To prevent electri-
cal shock and /or equipment damage, disconnect electrical
power to the system at the main fuse or circuit breaker until
installation is complete.
Remove the front cover of old thermostat. With wires still at-
tached, remove wall plate from the wall. If the old thermostat has
a wall mounting plate, remove the thermostat and the wall mount-
ing plate as an assembly.
Before removing wires from old thermostat, label each wire
with the terminal designation from which it was attached.
Disconnect the wires from the old thermostat one at a time. Do
not let wires fall back into the wall.
ATTENTION: MERCURY NOTICE
This product does not contain mercury. However, this product may
replace a product that contains mercury. Mercury and products contain-
ing mercury must not be discarded in household trash. Do not touch any
spilled mercury. Wearing non-absorbent gloves, clean up any spilled
mercury and place in a sealed container. For proper disposal of a prod-
uct containing mercury or a sealed container of spilled mercury, contact
your local hazardous waste center.
Jumper and Circuit Board Selections
JP1 Jumper Selection – Remote Temperature Sensor: Removal
of this jumper allows the temperature sensor to be located in a remote
location. Accessory sensors are available in standard 60” lengths but
can be extended to meet application requirements. When running probe
beyond 60” care should be taken to avoid sources of EMF.
The remote probe input can be used with a condensate overow
switch (CO), either in conjunction with a remote probe (normally
closed CO switch) or with local sensing (normally open CO
switch). When the condensate switch activates, the T170 will
display the service wrench and disable all outputs.
JP3 Jumper Selection – HVAC Setback Systems: This jumper is
shipped in the open position to allow for Setback Operation. Place-
ment of a jumper allows for Occupancy Detection and Door Switch Only
Operation. See Choice Below:
Setback Operation (Remove JP3): When installed, the TH170
Heating and cooling setback limits are used as temperature
control points. Fan operation in setback is cycled with demand.
Pressing any button will override setback for 1 hour. Setback will
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override any user setting except if the control is turned to OFF.
Units with an off-override factory setting will override the OFF
setting. Intelligent Occupancy Sensors like the SD200-001 and
SD200-002 can be used with this input to set the HVAC system to
control at setback limits.
Occupancy Detection (Install JP3): The TH170 can be used
with PECO S200 series occupancy detection equipment. The
occupancy and door switch inputs are designed to connect to the
SB200 slave sensor and SE200 door switch. The Occupancy
Sensor is a low-level switch that is open when there is occupancy
and closed when unoccupied. The Door Switch is a low-level
switch that is open when the door is open and closed when the
door is closed. This system requires both an Occupancy Sensor
and a Door Switch.
Door Switch Only Operation (Install JP3): A stand alone door
switch can be connected to the TH170 to disable the HVAC sys-
tem if the door is left open for more than 2 minutes. A one-time
ten minute override can be initiated by pressing any thermostat
key.
JP4 Jumper Selection – Unused
Mounting Thermostat
Thermostat mounts to a 4” x 4” box with a 2” x 4” mud ring
mounted horizontally (see diagram).
Pull wires through the hole of the thermostat base.
Mount thermostat base to the wall using the enclosed mounting
screws. Tighten screws evenly but do not over tighten.
Verify that the circuit board is rmly snapped into the cover and
has not been dislodged during handling.
Match and connect equipment wire thermostat using the appropri-
ate wiring schematic as shown in the diagram.
Wire nut all unused wires or terminate properly according to local
building codes.
Push excess wire into wall and plug hole with a re-resistant
material (such as berglass insulation) to prevent drafts from af-
fecting thermostat operation.
Install the cover assembly. Firmly press cover to engage the
cover locking snaps. Should the cover need to be removed in the
future, use a at edged tool to put pressure on the base sides.
This will release the four side latches.
Turn on power to equipment.
All wiring connections must be made
inside the electric box or the TH170
may be damaged.
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24 VAC 1 (HOT)
24 VAC 2 (NEUTRAL)
Inputs
L1 and L2 Power Input - Both sides of the external power supply
for the thermostat and controlled devices.
Outside Air Temperature Sensor (Optional) - This input will con-
nect to a PECO standard 10K thermistor.
Zone Temperature Remote Probe Input / Condensate Over-
ow (Optional) - This input will connect to a 10K thermistor. A low
level switch may also be connected to this input with or without
the thermistor. Switch closure indicates overow.
Occupancy Sensor Input (Optional) - The Occupancy sensor is
a low-level switch that is open when occupied and closed when
unoccupied.
Door Switch / Setback Input (Optional) - This input is assigned
to Door Switch when jumper JP3 is placed. The Door Switch is
a low-level switch that is open when the door is open and closed
when the door is closed. This input is assigned to Setback when
jumper JP3 is removed. The Setback input sensor is a low-level
switch that is closed to signal Setback and open for normal opera-
tion.
Relative Humidity Input (Optional) - This input is connected to
a separate humidity transducer on the circuit board (not shown
in the wiring diagram), that provides a DC signal to indicate the
relative humidity.
Outputs
Each output is connected to the L1 connection when enabled. Each
output device is returned to the L2 connection.
Y1 First Stage Compressor - Output cycles with an Active
Demand for Heating or Cooling and disables when an Active
Demand seizes.
Y2 Second Stage Compressor - Output is enabled if an active
demand has been present for a minimum of 10 minutes and the
temperature is equal to or greater than 2°F from the Set Point.
The 2nd Compressor Stage can only be enabled or disabled if 1st
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Compressor Stage is enabled.
Reversing Valve - This output is enabled with an Active Demand
for Cooling and disabled with an Active Demand for Heating.
Default setting can be changed in the Service Menu 11 to reverse
the logic.
Dehumidication / Humidication / Outside Air - This output
can be congured for Dehumidication, Humidication, or Outside
Air operation. A humidity sensor module must be connected to
the PCBA for the humidity control to function. If you are installing
a TH70-001, only the Outside Air Economizer feature is available.
Fan or Fan Low - This output is enabled by manual user selec-
tion or through Auto Fan Selection microprocessor operation. The
Fan is enabled either continuously or with active demand. When
Fan High is an available selection and is enabled, this output is
disabled.
Fan High or Aux Heat - This output can be congured for either
Fan High or Aux Heat through the service menu. Default is Aux
Heat. When the system is operating in AUTO mode, the Aux
Heat output is enabled when the room temperature is equal to
or greater than 3°F from the temperature Set Point and after the
time delay is met in Service Menu 18. Fan High is selected by
manual user selection or through Auto Fan Selection. The Fan
High is enabled either continuously or with active demand.
DESCRIPTION
Y1 1st Stage Compressor
Y2 2nd Stage Compressor
O Reversing Valve
H Provides Humidication, Dehumidication, or Outside Air
based on conguration
G Fan G1 Fan Lo
W Aux. Heat G2 Fan High
OR
System Check-Out
After wiring and installation is complete, energize the system.
Set fan to ON. Select each fan speed (if available) to verify
operation.
Set the System button to AUTO, or available selection.
Using the UP arrow, adjust temperature more than 5°F above the
current room temperature to cycle on heating.
Using the DOWN arrow adjust the Set Point to 5°F below current
room temperature to cycle on cooling.
THERMOSTAT CONFIGURATION / SERVICE MENU
Please refer to page 6 for service menu table.
To enter the Service Menu press the UP and DOWN arrows
simultaneously for ve (5) seconds. The current display icon will
turn off and Service Menu 1 will be displayed.
Push the SYSTEM button to move through Service Menu items
1-22.
The UP and DOWN arrow keys will scroll through the range of op-
tions for each Service Menu feature. The selection that is ashing
is the one you are selecting.
All changes to the Service Menu are automatically saved when
the system times out.
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© COPYRIGHT 2008 PECO, INC. ALL RIGHTS RESERVED. P/N 69290 3220-2088 REV 0 PAGE 3

USER OPERATION
Room Temperature and Adjustable Set Point (desired) Temperatures
Unless adjusted in the Service Menu, the thermostat will show the cur-
rent room temperature on the display.
To show the current Set Point Value (desired room temperature), press
either the UP or DOWN arrow keys. The initial power-up Set Point is
72° F. This value can be adjusted using the arrows keys. Adjustments
to the Set Points are stored in the non-volatile memory, and are used for
subsequent power ups.
System Switch Operation (SYS)
OFF: All thermostat outputs are disabled.
HEAT: Operates as a Heating only thermostat.
COOL: Operates as a Cooling only thermostat.
AUTO: The thermostat automatically selects between Heat
ing or Cooling mode depending upon the Set Point
(Desired Temp) and Zone Temperature (Actual
Temp). The appropriate HEAT or COOL icon is
enabled if demand exists.
SETBACK: An energy saving feature that minimizes heating and
cooling when the room is not occupied. The thermo-
stat will control to the SETBACK Heat and Cool Set
Points, rather than the standard Set Points. When in
SETBACK, the display will show the room tempera-
ture along with the SETBACK icon. Key presses will
have no effect on the Setback operation except for
the System Switch Selection button, which allows
the user to exit the SETBACK mode.
AUX HEAT: For emergency heating applications, when the oc-
cupant wants only the Auxiliary Heat Source to oper-
ate. The heat pump does not operate in this mode.
Fan Operation
If the Heat Pump operates with 1 Fan Speed, occupants can choose
either FAN ON or FAN AUTO.
With FAN ON selection, the Fan is on continuously, even when no
heating or cooling is required.
With FAN AUTO selection, the Fan is on only with active demand.
If the Heat Pump operates with 2 Fan Speeds, occupants can choose:
FAN LO, FAN HI, or FAN AUTO.
With FAN LO selection, the fan is on continuously at the fan low
speed.
With FAN HI selection, the fan is on continuously at the fan high
speed.
With FAN AUTO selection, the thermostat selects the fan speed
and enables the appropriate output according to how far the room
is away from the desired Set Point. Fan Low operates between
Set Point and Fan High. Fan High is enabled 2°F from desired
Set Point (congurable via Service Menu 12 Fan Stage Separa-
tion) and is disabled 1°F from the desired Set Point.
Sensor Readings – STATUS Button
Outside Air (OA) Temperature – Push the Status Button to read
value. If a Sensor is connected, the current sensed temperature
will be displayed in the digits along with the OUTSIDE icon. If the
OA input is closed the unit will display F1 in the digits as an indi-
cation that the lter needs to be changed. If this input is open the
unit will skip over OUTSIDE and go directly to the display of %RH.
Relative Humidity (RH) - If a humidity sensor is installed, the %
RH will be displayed by pushing the Status Button. Pressing
the UP or DOWN button will display the current %RH desired
Set Point and will allow the operator to adjust this value. The
SP range for Humidity is 20-45%RH and Dehumidication is 50-
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90%RH.
Selection of Humidify or Dehumidify must be made in Service
Menu 12 to allow the adjustment of %RH Set Point. If Outside Air
operation is selected from Service Menu 12, instead of Humidi-
cation or Dehumidication, then %RH Set Point is only adjustable
for Outside Air selection conguration 4 and 5. If this RH input is
open the unit will skip over %RH and go directly to display of F/C.
Fahrenheit / Celsius- Enables occupant to change readings to
Celsius. Push the status button until F/C option is displayed and
then use the arrow keys to change the display option.
TECHNICAL / APPLICATION NOTES
Dehumidication Control
Dehumidication is only enabled during COOL mode. Selectable range
is 50-90%RH, with a default value of 90%. If you have a TH170-001 (no
onboard RH sensor), the three dehumidication options are disabled in
the service menu.
With most dehumidier equipment, when there is an active RH demand
the output is disabled and in the Normally closed position. If the dehu-
midication equipment operates in the reverse, Service Menu 21 will
allow the installer to enable the output with RH demand.
The dehumidication user selection congurations are:
Dehumidication Only (Default): If the %RH reading > the RH
Set Point (SP) the dehumidier turns on.
Over Cool: The temperature is allowed to drop up to 3°F below
Temp SP to satisfy the dehumidication demand. For every
degree the Temp SP decreases, the %RH SP is automatically
increased by 2%. For every degree the Temp drifts back toward
the Temp SP, the %RH Set Point is automatically decreased by
2%. If the %RH SP is user changed while the %RH SP is being
shifted, the system will use the new %RH SP. During Over Cool
operation, the user selected Temp SP value will only be displayed,
not the Over Cool SP value. The overcool operation used only
Compressor 1, Fan LO, and dehumidication output to meet
dehumanization demand.
Dehumidication OFF: Independent of Dehumidication De-
mand, the output is enabled (dehumidier is off).
Humidication Control
Humidify is only enabled during HEAT or AUX HEAT modes. Selectable
range is 20-45%RH, with a default value of 20%. If you have a TH170-
001 (no onboard RH sensor), all ve Humidication selections are dis-
abled. HU 3-5 are only displayed if an outside air sensor is connected.
The Humidity user selection congurations are:
Humidify Only: Humidity output is enabled (Humidier ON) when
the %RH < RH Set Point.
Humidify with Fan: With a Humidity demand (%RH < RH Set
Point), Humidier and Fan LO are enabled.
Auto Humidify: If the Outside Air Temperature is above 50°F,
the humidity output is enabled (Humidier ON) when the %RH
< RH SP (same as HU1). If the OA Temperature is ≤ 50°F, the
%RH SP is automatically reduced by 1% for every drop of 2°F
in OA Temperature between 0-50°F. The humidication output
is disabled when the RH SP ≤ %RH. The condition is reversed
when the OA Temperature increases between 0-50°F. If the %RH
SP is user changed, the system will use the new SP.
Auto Fan Humidify: In conjunction with conguration 3, Fan LO
is enabled with Humidication demand.
Humidify OFF: Independent of Humidication Demand, the
output is disabled (humidier is OFF)
Outside Air (OA) Economizer Operation
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© COPYRIGHT 2008 PECO, INC. ALL RIGHTS RESERVED. P/N 69290 3220-2088 REV 0 PAGE 4 © COPYRIGHT 2008 PECO, INC. ALL RIGHTS RESERVED. P/N 69290 3220-2088 REV 0 PAGE 5

The thermostat has an economizer feature that allows the use of outside
air to cool the controlled space when outside air is at an appropriate
temperature with respect to Room Temperature and Temperature Set
Point (SP). This section also outlines logic to be used with RH sensor
enabled units (-002 Models) to address potential increases to indoor
humidity caused by humid outside air during Economizer operation.
The OA output is disabled anytime the thermostat is operating in the
OFF or SETBACK modes, or when the Setback input is closed. If you
are installing a TH170-001 (no onboard RH sensor), selections 4 and 5
are disabled. An OA Sensor is required for OA3-5.
The Outside Air Economizer user selection congurations are:
Outside Air Damper (Default): Any time the thermostat is out
of OFF mode or not operating in Setback, the Outside Air output
is enabled (damper open). This feature can be used to provide
minimum ventilation.
Outside Air Damper Cycle: This feature enables OA output with
an active heating or cooling demand.
Outside Air Economizer: In this setting, the OA damper
operates only during active Cooling demand and is based on
OA temperature. If the sensed OA Temperature is ≤ the room
temperature minus the OA Economizer Offset, then the OA output
is enabled. The OA output is disabled when the OA Temperature
> the Room Temperature minus the OA Economizer Offset. OA
Economizer Offset range is user selectable from 0 - 15°F in the
Service Menu, with a default of 10°F. The Outside Air Econo-
mizer conditions are continuously checked.
OA and Relative Humidity Economizer: Like option 3, the
OA damper operates only during active Cooling demand, but its
operation is based on both OA temperature and %RH values.
The OA economizer follows the logic of option 3, unless excess
humidity is created and/or the conditions in conguration 3 are no
longer met.
OA and Relative Humidity Economizer with Humidity Abate-
ment: Like option 3 and 4, the OA damper operates only during
active Cooling demand. Like option 4, operating logic is based
on both OA and % RH values. The OA economizer uses OA
to provide economizer operation and will OVERCOOL to abate
excess humidity.
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OCCUPANCY OPERATION
If the TH170 is installed with occupancy sensors, operation is as follows:
In an Occupied State the thermostat operates normally and looks for an
open door.
On a Door Open signal the thermostat begins to control the
ambient temperature to the programmed Set Point and waits for a
door close. If door is open for more than 2-minutes the thermo-
stat outputs are disabled. If a button is pressed on the keypad
before the two minute timer expires, the time delay is extended
to 10 minutes. The time delay can only be extended once. If the
thermostat is powered up in the Occupied State and the door is
open, after 10 minutes the thermostat will disable its outputs. The
Reversing value may remain enabled depending on the demand
and conguration. Once the thermostat outputs are disabled, a
door closure is required to re-enable the outputs.
On a Door Closed signal the thermostat starts a 2-minute timer in
which to look for occupancy. If the occupancy sensor transitions
to unoccupied and the timer expires, the thermostat enters into
the Unoccupied State. If the occupancy sensor transitions from
unoccupied to occupied while the timer is running the thermostat
will remain in Occupied State. If the occupancy sensor transitions
from unoccupied to occupied after the 2-minute timer expires, the
thermostat will remain in the Occupied State.
In an Unoccupied State the thermostat sets Heating and Cooling Set
Points to Setback values, as determined by factory or user settings. In
this mode the fan is automatically set to cycle with demand. The ther-
mostat will continue to monitor the occupancy sensor and will go to the
Occupied State if it sees occupancy.
If the only a Door / Window Switch is installed, the thermostat will dis-
able the thermostat outputs when the input is open for longer than 2
minutes.
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© COPYRIGHT 2008 PECO, INC. ALL RIGHTS RESERVED. P/N 69290 3220-2088 REV 0 PAGE 4 © COPYRIGHT 2008 PECO, INC. ALL RIGHTS RESERVED. P/N 69290 3220-2088 REV 0 PAGE 5
Operation (i.e. example)
OA damper is always enabled (damper open). OA closed in OFF or Setback modes.
76 > 72 = Active Cooling demand and OA Damper is enabled. OA damper is enabled (damper open) whenever there is active
heating or cooling demand.
60 ≤ 72 – 10 = OA Economizer Enabled (Open) if an active cooling demand exists.
OA Economizer offset is user adjustable in the service menu.
60 ≤ 72 – 10 = OA Economizer Enabled and Timer Set
RH also checked : 72%RH (value is stored)
5 minutes pass with Damper enabled
Thermostat checks for 2 conditions. If either is TRUE, the OA is disabled.
New RH - Stored RH > 10% 80 - 72 > 8% FALSE
New RH > RH SP 80 > 77 TRUE
OA is disabled
1 hour timer begins. After 1 hour, OA & RH are checked again.
60 ≤ 72 – 10 = OA Economizer Enabled and Timer Set
RH also checked : 72%RH (value is stored)
5 minutes pass with Damper enabled
If New RH > RH SP, the OA is disabled 80 > 77 OA is disabled
Overcooling operation begins, allowing the Temp. to drop up to 3°F below the Temp SP to satisfy the dehumidication demand.
1 hour timer begins
After 1 hour OA & RH are checked again
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Conditions
Any Temperature
Room Temp = 76
Temp SP = 72
Cool or Auto Mode
OA = 60
Temp = 72
Offset = 10
Cool or Auto Mode
OA = 60
Temp = 72
Offset = 10
Current RH = 72%
New RH = 80%
RH SP = 77%
Cool or Auto Mode
OA = 60
Temp = 72
Offset = 10
Current RH = 72%
New RH = 80%
RH SP = 77%
Cool or Auto Mode
Requirements
None
None
OA Sensor
TH170-002 Model
+ OA Sensor
TH170-002 Model
+ OA Sensor
Mode
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© COPYRIGHT 2008 PECO, INC. ALL RIGHTS RESERVED. P/N 69290 3220-2088 REV 0 PAGE 6 © COPYRIGHT 2008 PECO, INC. ALL RIGHTS RESERVED. P/N 69290 3220-2088 REV 0 PAGE 7
Menu #
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12
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15
Feature
Default Display
Fan Off Delay
Range Low
Range High
Setback Low
Setback High
Zone Temp
Offset
Keypad Lock
UNUSED
UNUSED
Reversing Valve
Dehumidify,
Humidity,
Outside Air
Fan Stage
Separation
Dead Band
Adjustment
Off Override
Range
Zone Temp, Set Point
0 – 255 Seconds
50º - 90ºF,
10º - 32ºC
50º - 90ºF,
10º - 32ºC
OFF,
50º - 82ºF,
11º- 27ºC
OFF,
58º - 90ºF,
15º - 31ºC
-9º to 9ºF,
-4.5º to 4.5ºC
ON 1
ON 2
OFF
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B,O
DH,
HU,
OA
2º to 10°F,
1º to 5ºC
3º to 10°F,
1.5º to 5ºC
Enable/Disable
Factory Default*
Zone Temp
0
50ºF
90ºF
55ºF
90ºF
0ºF
OFF
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O
DH1 (-002 Model) or
OA1 (-001 Model)
2°F
3°F
OFF
Increment
-
1 Second
1ºF, .5ºC
1ºF, .5ºC
1ºF, .5ºC
1ºF, .5ºC
1ºF, .5ºC
-
-
-
-
-
1ºF, .5ºC
1ºF, .5ºC
-
Comments
Choose if you want the Set-Point or Room Temperature to be the
primary display on the thermostat. TH170 defaults to a Room
Temperature display. If you want the Set Point as the default dis-
play, the SETPOINT icon should be ashing in the service menu.
Choose the amount of time (in seconds) the lowest available fan
speed will run after the thermostat outputs have been disabled.
The lowest temperature Set Point value that the occupants will be
able to choose.
The highest temperature Set Point value that the occupants will be
able to choose.
Choose the temperature Set Point value you want the thermo-
stat to Heat to when the TH170 is in the Setback mode. When
enabled, the user can select from a range of 50° – 82°F. A user
selection of OFF will disable the Heating Setback.
Choose the temperature Set Point value you want the thermo-
stat to Cool to when the TH170 is in the Setback mode. When
enabled, the user can select from a range of 58° – 90°F. A user
selection of OFF will disable the Cooling Setback.
Zone Temperature offset adjusts the sensed Zone Temperature
reading.
Allows you to choose what the occupant can adjust on the TH170.
Entry into the Service Menu is still available if Key Pad Lock Out
is turned on.
ON1 = Disables Sys/FAN/Status
ON 2 = Disables all buttons
OFF = No keypad lock out is available.
The reversing valve output can be congured for B terminal
Operation or O terminal operation. When O is selected, a demand
for Cooling enables the Reversing Valve. When B is selected, a
demand for Heating enables the Reversing Valve.
The selected conguration corresponds with the desired DH, HU,
or OA operation. If no RH sensor or OA sensor is connected,
only OA1 and OA2 will be available. If the thermostat is operating
with a RH sensor (TH170-002 Model) and the Outside Air sensor
is connected, all congurations will be selectable. If only an
OA sensor is connected, then OA 1-3 are available. For further
information see Technical/Application Notes.
The difference between the temperature set-point value and when
Fan High is enabled.
A congurable Deadband is provided to prevent short cycling
between Heating and Cooling modes. Transitioning from Heat to
Cool or Cool to Heat requires a minimum 3°F temperature error
from the Set-Point to trigger a Changeover. The thermostat will
automatically bring the control point back from the error to the
current Set-Point. Deadband is enabled only in the AUTO mode of
operation. After Changeover the control point automatically shifts
so that the control off point equals the Set Point temperature.
When enabled, the unit will control to the Setback Set Points and
override the user mode setting of OFF if the room temperature is
equal to or above the Cool Setback Set-Point or equal to or below
the Heat Setback Set-Point.
The DH/HU/OA output is disabled in Off Override.
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© COPYRIGHT 2008 PECO, INC. ALL RIGHTS RESERVED. P/N 69290 3220-2088 REV 0 PAGE 6 © COPYRIGHT 2008 PECO, INC. ALL RIGHTS RESERVED. P/N 69290 3220-2088 REV 0 PAGE 7
Menu #
16
17
18
19
20
21
22
Feature
HI Fan or Aux Heat
Dual Fuel Operation
Heat Pump Economy/
Comfort
%RH User Adjust
Front Panel
Setback Control
Dehum. Normally
Open/Closed
OA Economizer
Offset
Range
FAN HI,
AUX HEAT
OFF,
0º - 55ºF,
-9.5º – 13.5ºC
OFF,
0 – 55 Minutes
Enable / Disable
Enable / Disable
Normally Open (NO) /
Normally Closed (NC)
0º to 15ºF,
0º to 7.5ºC
Factory Default*
AUX HEAT
OFF
15
Enabled
Disabled (Off)
NC
10°F
Increment
-
1ºF, .5ºC
1 minute
-
-
-
1ºF, .5ºC
Comments
Selects either Fan High (2 Fan Speeds) or Aux Heat operation.
If Fan High is selected, AUX HEAT mode is disabled.
Available modes: OFF, HEAT, COOL, AUTO
If Aux Heat is selected, Fan High is disabled.
Available modes: OFF, HEAT, COOL, AUTO, Aux HEAT
Disables Heat Pump operation if Outside Air Temperature is below
the selected value and a Heating demand exists.
If OFF is selected, and/or AUX HEAT is not enabled in Service
Menu 16, and/or no OA Temperature Sensor is connected, Dual
Fuel Operation is disabled. The Heat Pump operation is then
allowed at all temperatures.
If 0-55°F is selected for the OA Temperature and the OA Tempera-
ture sensor drops below the selected value, the Heat Pump opera-
tion will be disabled only for a Heating demand. When the OA
Temperature increases equal to or greater than the selected OA
value, Heat Pump operation is enabled and Aux Heat operation is
disabled. The Aux Heat output may still be enabled if a valid Aux
Heat demand exists. Heat Pump operation must meet minimum
On and Off time to prevent short cycling.
Enables a delay to On for Aux Heat output; default is 15 minutes.
The delay is only enabled during AUTO or HEAT modes.
Allows occupant to adjust or not adjust RH levels.
This menu item enables SETBACK as a system mode selection. If
SETBACK mode is selected, the thermostat will control to the cur-
rent Setback Heat and Setback Cool Set Points. The thermostat
will not respond to any changes in the Setback input if SETBACK
mode is selected.
During Setback operation, the thermostat will override the default
display to display the Zone Temperature and SETBACK icon. Any
key presses will have no effect on the Setback operation except for
the System Switch Selection button. Pressing the System Switch
button will allow the user to exit the SETBACK mode.
If disabled, Setback is not an available mode and feature. The
thermostat will respond to changes in the Setback input if SET-
BACK mode is not selected.
Normally Closed: If RH Demand = Output Disabled
No RH Demand = Output Enabled
Normally Open: If RH Demand = Output Enabled
No RH Demand = Output Disabled
The adjustable value that is subtracted from the room temperature
and then compared to the OA temperature. If OA ≤ Temp minus
Offset, then OA damper is enabled.
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© COPYRIGHT 2008 PECO, INC. ALL RIGHTS RESERVED. P/N 69290 3220-2088 REV 0 PAGE 8