Electronic/Mechanical
Thermostat
installation and
operation manual
Model 40120
1
44018-01 04-01-2008
Table of Contents
attaching the thermostat ..................... 17
Wiring Diagrams.............................................27
3
Electronic/Mechanical
Thermostat
Model 40120
Congratulations!
Thank you for choosing a Hunter thermostat.
Your new Hunter 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.
4
IMPOrTAnT InFOrMATIOn
This thermostat is designed to work on the following
heating and cooling systems:
Gas – Standing Pilot
Gas – Electronic Ignition
Gas – Fired Boilers
Gas – Millivolt Systems
Oil – Fired Boilers
Oil – Fired Furnace
Electric Furnace
This thermostat is not designed for heat pump
systems or 110/220 V baseboard heating systems.
If you are unsure what kind of heating and cooling
system you have, please contact a qualified HVAC
Technician for assistance.
5
TOOlS
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
......................................................................................
Two fresh 1.5 Volt (AA) size alkaline batteries
......................................................................................
6
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.
7
8
UnInSTAllInG THE ExISTInG UnIT
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.)
9
If your existing
thermostat is marked...
label the wire
with this sticker:
H r
rH
W
rH / r / Vr / 4
24 Volt
heating
fan
W / H
W
G
G / F
G
* See page 27 for complete wiring diagram.
10
UnInSTAllInG THE ExISTInG UnIT, COnT.
4. Using the provided stickers, label each wire
according to the chart.
(If the terminals are not labeled, contact a
qualified 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 identification.
*If a wire marked C is 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.
11
13
InSTAllInG THE THErMOSTAT, COnT.
InSTAllInG THE WAll PlATE
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
Hunter wall plate, or if there are no existing
holes, level the wall plate and mark the wall for
two holes.
4. remove the wall plate and drill two 3/16” holes
where marked.
5. Tap the plastic anchors into the holes until they
are flush with the wall.
6. reposition the wall plate on the wall, pulling the
wires through the opening. Insert the mounting
screws through the mounting holes and into the
anchors. Verify that the thermostat is visually
level and securely tighten both screws.
14
G
W
RH
15
InSTAllInG THE THErMOSTAT, COnT.
COnnECTInG THE WIrES
1. loosen, but do not remove, the terminal
screws.
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.
16
HE/HG Switch
HE
HG
17
InSTAllInG THE THErMOSTAT, COnT.
ATTACHInG THE THErMOSTAT
4. locate the HE/HG s w it c H on the back of the
thermostat. Set the switch to HG for a gas
furnace or oil burner. Set the switch to HE for
electric furnaces.
5. Insert two fresh AA alkaline batteries.
6. Align the thermostat with the the wall plate,
and snap the two halves together.
7. restore power at the electrical panel or
furnace.
18
19
Set Temperature
Slider
Thermometer
System
Switch
SYSTEM
OFF
9
0
0
90
30
HEAT
8
80
70
70
60
50
20
60
AUTO
ON
10
C
50
F
F
Fan
Battery Indicator
20
Switch
OPErATIOn
1. Set the sE t tE m p E r a t u r E s l id E r to the desired
temperature.
2. The sy s t E m sw it c H determines the operating
mode of the thermostat. Select Of f or HE a t .
3. The fa n sw it c H should normally be located in
the au t O position. To run the fan continuously,
slide the fa n sw it c H to the On position.
note: In
, The fan will be turned on along with normal
au t O
operation of your system. In a normal gas or oil furnace, the
fan will be turned on by your furnace after its warm-up delay.
21
InDICATOrS AnD ADUSTMEnT
1. The tH E r m O m E t E r indicates the room
temperature.
2. The Ba t t E r y in d ic a t O r displays two stages of
wE a k Ba t t E r y wa r n in G , indicated by the Ba t t E r y
in d ic a t O r flashing once approximately every
second. When this warning appears, install
two fresh AA alkaline batteries at your earliest
convenience.
3. The second warning is the sH u t -d O w n in d ic a t O r ,
indicated by the Ba t t E r y in d ic a t O r flashing
approximately twice every second. When this
warning appears, the thermostat is shut down
and will turn your system OFF. Your system
will remain shut-off until you install two fresh
AA alkaline batteries.
22
Span Adjust
SPAN
23
InDICATOrS AnD ADjUSTMEnTS, COnT.
Your thermostat is preset to cycle your system
off and on at 1oF above and below the Set
Temperature. For maximum system efficiency and
a sustained comfortable temperature your system
should cycle 3 - 5 times per hour. If your system is
cycling either too often or not often enough, then
use a small Phillips-head screwdriver to turn the
sp a n ad j u s t left or right to change the cycle time.
1. remove the thermostat from the wall plate.
2. To make your system run lOnGEr, turn the
sp a n ad j u s t clockwise.
3. To make your system run SHOrTEr, turn the
sp a n ad j u s t counter clockwise.
4. reattach the thermostat to the wall plate.
o
o
note: The Span range is 0.6 F - 3 F. The Span setting remains
the same in both the Heat and Cool modes and can be
changed regardless of what position the System Switch is in.
24
1. My heating or cooling will not turn on or off.
1 a. Check the HE/HG switch to ensure it is set to the correct
position.
1 b. Check the circuit breakers and switches to ensure there is
enough power to the system.
1 c. replace the batteries with fresh AA alkaline batteries.
1 d. If applicable, make sure the furnace blower door is closed
properly.
......................................................................................
2. My system continues to operate when the
thermostat is in the off position.
2 a. replace unit.
25
TrOUBlESHOOTInG
Is there help on the web?
....................................................................................
.........
Can’t I just call someone?
Sure. Our Technical Support Group is available from 8 am
to 5 pm CST. They may be reached toll-free at1-888-830-
1326.
26
WIrInG DIAGrAMS
2-wire Heat Only System
Rh
W
Heat 24V or
Millivolt Supply
Heat Relay
or Valve
3-wire Heat Only System
G
Rh
W
Heat 24V
Supply
Heat Relay
or Valve
Fan
Relay
27
© 2007 Hunter Fan Company
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