Smart temp 42158 User manual

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PROGRAMMABLE
THERMOSTAT
Model 42158
Installation and
Operation manual
42711-01 08-18-08

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Table of Contents
Important Information ....................................... 5
Tools 6
Uninstalling the Existing Unit............................ 7
Installing the Thermostat ................................ 12
installing the wall plate ................................ 12
connecting the wires ................................... 16
attaching the thermostat ............................. 18
Settings........................................................... 22
Methods of Operation..................................... 26
manual operation ........................................ 28
default programs ......................................... 32
creating custom programs .......................... 34
Icons and Features......................................... 38
Wiring ............................................................. 49
Troubleshooting.............................................. 52

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Congratulations!
Thank you for choosing a Smart Temp
programmable thermostat. Your new Smart
Temp thermostat will provide years of reliable
service and year-round energy savings.
Please read this manual before beginning
installation and save this booklet for complete
operation instructions.
Smart Temp
Programmable Thermostat
Model 42158
Smart Temp
Programmable Thermostat
Model 42158

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This thermostat is designed to work on the following
heating and cooling systems:
Gas – Standing Pilot
Gas – Electronic Ignition
Gas – Fired Boilers
Gas – Milivolt Systems
Gas Heat with Add on Cooling
Single Stage Heat Pump - No auxilary
This thermostat is not designed for multi-stage
systems or mains 240V AC Switching.
If 240V Switching is required an optional
Smartpak-03 interface is required. Please contact
your place of purchase or Smart Temp.
If you are unsure what kind of heating and cooling
system you have, please contact a qualied HVAC
Technician for assistance.
IMPORTANT INFORMATION

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This thermostat includes two #8 slotted screws
and two wall anchors for mounting.
To install your new thermostat, you will need the
following supplies:
Flat-head screwdriver
....................................................................................
Small Phillips-head screwdriver
....................................................................................
Hammer
....................................................................................
Electric drill and 3/16” bit
....................................................................................
TOOLS

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NOTICE! Do not disconnect the
wires from the existing thermostat
before reading these instructions.
The wires must be labeled prior
to removal to ensure proper
reconnection.

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Y
RC
G
W
Y
RC
G
W

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1. Turn the system power OFF from the existing
thermostat. Turn the power to the HVAC
system OFF at the main power panel or at
the furnace.
2. Remove the existing thermostat cover to
access the wires from the wall.
(Some thermostats may have multiple covers, screws
or other locking devices that must be removed or
disengaged.)
3. Locate, but do not disconnect the wires.
(If wires are not visible, they may be connected to the
back of the wall plate. Some models may have doors
that open to expose the wires and mounting screws.)
UNINSTALLING THE EXISTING UNIT

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GRCRHYW
ifyourexisting
thermostatismarked...
labelthewire
withthisstic
k
:
G/F
G
G
W/H/B
W/B
W / B
Y/C*/M/O
Y/0
Y / 0
RC/VC
RC
R C
RH/R/VR/4
RH
R H
24Volt
24Voltcool
airconditioning
compressor
heating
fan
Y1
Y1
Y 1
heatpump
compressor

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4. Using the provided stickers, label each wire
according to the chart.
(If the terminals are not labeled, contact
a qualied HVAC technician.)
Note: Wire colors do not always comply
with standards, so wire color should be
ignored. Refer to the existing terminal
designation for proper identication.
*If wires marked Y & C are both present, C may
be a Common wire and should not be used. If
you have a wire marked C, do not connect it
to any terminal. This wire is used only for non-
battery powered thermostats.
5. Do not let the wires slip back into the
wall during disconnection. You may want
to secure the wires to the wall as you
disconnect them. After all wires are labeled,
disconnect each wire and remove the
existing wall plate.
UNINSTALLING THE EXISTING UNIT, CONT.
Y
RC
G
W
W

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W
R C
Y
G

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INSTALLING THE THERMOSTAT
INSTALLING THE WALL PLATE
1. Remove the wall plate from the new
thermostat by pressing the release tab on the
bottom of the thermostat.
2. Position the new wall plate on the wall and
pull the labeled wires through the opening.
3. If the existing holes do not match those on
the Smart Temp 42158 wall plate, or if there
are no existing holes, visually level the wall
plate and mark the wall for two holes.

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W
R C
Y
G

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4. Remove the wall plate and drill two 3/16”
holes where marked.
5. Tap the plastic anchors into the holes until
they are ush with the wall.
6. Reposition the wall plate on the wall, pulling
the wires through the opening. Insert the
mounting screws through the wall plate and
into the anchors. Verify that the wall plate
is visually level and securely tighten both
screws.
INSTALLING THE THERMOSTAT, CONT.

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GRCRH Y/0
W/B
R C
G
Y1
Y/ 0
W / B
Y 1
TerminalShield

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INSTALLING THE THERMOSTAT, CONT.
CONNECTING THE WIRES
1. Loosen, but do not remove, the terminal
screws.
Note: A jumper wire has been provided,
connecting the RC and RH terminals for
systems that do not provide both an RH
and RC wire. If you have both an RH and RC
wire, remove this jumper. If you do not have
both an RH and RC wire, leave the jumper in
place.
2. Match and connect the wires from the wall
to the terminals as shown. Wires should be
inserted behind the black terminal shields.
Tighten each screw after the connection has
been made.
(The ends of any extra wires should be wrapped in
electrical tape and carefully pushed back into the wall.)
3. Push any excess wire length back into the
wall to prevent interference.
GRCRHYW
Jumper

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DISABLE
ENABLE
RECOVERY
HG
HE
W/BY/ORHRC G
SYSTEMTYPE
STD HP
Y1 FANOPTION
Thermostat
Cover
System
Switch
G RC RH Y/O W/B Y1

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ATTACHING THE THERMOSTAT
Lift the thermostat cover and set the SYSTEM switch to OFF
and the FAN switch to AUTO.
1. Locate the HE/HG switch on the back of the thermostat.
Set the switch to HG (default) for gas furnace and oil
burners. Set the switch to HE for electric furnaces.
(The switch has no effect when the system is set to
cooling mode.)
2. Locate the Auto Recovery switch on the back of
the thermostat. If you wish to use the Energy Star
compliant Auto Recovery feature, verify that the switch
is in the ENABLE position. If you do not wish to use
this feature, simply change the switch to the DISABLE
position. See pages 44-45 for more information.
3. System type - Locate the Sy S t e m ty p e switch on the
back of the thermostat. Select either STD (Standard) or
HP (Heat Pump) to match your system.
INSTALLING THE THERMOSTAT, CONT.

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