Hunter 42995B, 42999B Owner's Manual

JUST RIGHT
DIGIT AL THERMOSTAT

®

Owners Manual
Model 42999B

Congratulations!

Your new Hunter thermostat will provide years of reliable service.
Using this digital thermostat will provide more uniform comfort in
your home through the seasons. Thank you for buying a Hunter
product!

Please read this manual for complete instructions on installing and
operating your thermostat. If you require further assistance, call
Hunter Technical Support at 1-888-830-1326 from 8am to 5pm
Central Time.

Remove the mylar label from the display window.

IMPORTANT INFORMATION

1. This thermostat is designed to work on the following sys­tems:

• Gas - Standing Pilot

• Gas - Electronic Ignition

• Gas - Fired Boilers

• Gas - Milivolt Systems
This thermostat will NOT control single-stage or multi-stage heat

pumps or 110/220 V baseboard electric heating systems.

2. Temperature Range

This thermostat can be set between 45°F and 95°F (7°C and 35°C).
However, it will display room temperatures from 30°F to 99°F (0°C
and 37°C). “HI” will be displayed if the temperature is higher than
99°F (37°C), and “LO” will be displayed if the temperature is lower
than 30°F (0°C).

This thermostat will automatically cutoff in Heat mode if the tem­perature rises above 95°F (35°C), and automatically cutoff in Cool
mode if the temperature drops below 45°F (7°C).

3. Compressor Protection

This thermostat provides a 3.5 minute delay after shutting off the
cooling system before it can be restarted. This feature will prevent
damage to your compressor caused by rapid cycling. It does not
prevent a rapid compressor restart due to short power outages.

4. Battery Warning

Two fresh AA alkaline batteries should provide well over one year
of service. However, when the batteries become drained, the Low
Battery Indicator will flash on the display. When this message oc­curs, install new alkaline batteries. You have appr oximately 1 minute
to change the batteries and keep the thermostat’s settings. Once
the batteries have become too low to ensure proper operation,
your system will be turned Off, and the display will be cleared ex­cept for flashing Low Battery Indicator on the LCD display.

CAUTION: When only the battery icon flashes on the display,
the thermostat is shut down, and your system will no longer
operate. In this condition, there is no temperature control of
your dwelling.

NOTE: If you plan to be away from the premises over 30 days, we
recommend that you replace the old batteries with new alkaline
batteries prior to leaving.

FEATURES

Filter Change
Indicator: Flashes
when filter needs
to be checked.

Reset: Press with a
paper clip to reset the
thermostat and return
to power-up settings.

System
Switch:

Fan Switch:

Selector

Fan switch for

switch for

Automatic or

Heat, Cool,

Continuous

and Off.

fan operation.

• Oil - Fired Boilers

• Oil - Fired Furnace

• Electric Furnace

• Electric Air Conditioning

LCD Display:
Shows Room
Temperature,
Set
Temperature,
and other
feature
information as
required.

Filter Key:
Resets
the filter
change
counter
to zero.

Low Battery
Indicator:
Flashes when
batteries need
to be replaced.

Up and Down
Keys: Keys for
changing the
Temperature
setting. Also
used for
adjusting the
Span.

Front Doors:
Covers keys
and batteries
when not
used for neat
appearance.
Open with
one finger
from top or
bottom.

Battery
Compartment:
Front access allows
easy insertion of
two AA 1.5V
batteries.

INSTALLATION

What You Need

This thermostat includes two #8 slotted screws and two wall an­chors for mounting. To install your thermostat, you should have
the following tools and materials.

• Slotted Screwdriver(s)

• Small Philips screwdriver

• Hammer

• Electric drill and 3/16” bit

• Two 1.5 V (AA) size alkaline batteries

Remove Old Thermostat

CAUTION: Do not remove any wiring from existing thermo­stat before reading the instructions carefully. Wires must be
labeled prior to removal.

IMPORTANT! Turn off the power to the furnace at the main
power panel or at the furnace.

Remove existing thermostat cover and thermostat. See Figure 1.
Some thermostats will have screws or other locking devices that
must first be removed. Once the wall mounting plate is exposed,
look for wires.

If wires are not visible, they may be connected to the back of the
wallplate. Again, look for screws, tabs, etc. Some models have doors
that open to expose wires and mounting screws. See Figure 1.

Typical Home Thermostats

Wall Mounting Plate

Wall Mounting Plate

Thermostat

Thermostat

Figure 1

Wire Labeling

• Each wire coming from the wall to the existing thermostat is
connected to a terminal point on that thermostat. Each of these
terminal points is usually marked with a code letter as shown in
Table A below.

• The number of wires in your system can be as few as two (for
heat only systems), as many as eight, or any number in between.
If you follow the labeling procedures correctly , you do not have
to be concerned about how many wires there are.

• There is often no terminal marking on the existing thermostat
of two wire, heat only systems. Just connect either of the wires
to the Rh terminal, then connect the other wire to the W termi­nal to complete the circuit.

• IMPORTANT! BEFORE DISCONNECTING ANY WIRES, APPL Y THE
SELF-ADHESIVE LABELS PROVIDED TO THE WIRE AS SHOWN IN
TABLE A BELOW. (For example, attach the label marked W to
the wire that goes to the W or H terminal on your existing ther­mostat.) IGNORE THE COLOR OF THE WIRES since these do not
always comply with the standard.

• After labeling wires, disconnect them from the existing thermo­stat terminals.

• Remove existing wallplate. To make sure wires do not fall back
into wall opening, you may want to tape them to the wall.

• If hole in wall is larger than necessary for wires, seal this hole
with insulating material so that no hot or cold air can enter the
back of the thermostat from the wall. This air could cause a
false thermostat reading.

If the code letter on

your existing
thermostat is

RH, R, VR or 4
24 Volt

RC, VC
24 Volt Cool

G or F
Fan

Y, C or M
Air Conditioning
Compressor

W or H
Heating

NOTE: Do not connect a “Common” wire (sometimes labeled “C”)
to any terminal on this thermostat. Tape up the wire and do not
use. This wire provides electricity to non-battery powered thermo­stats.

Table A

then mark the

wire with label

shown

Cover

Cover

and connect to

thermostat terminal

shown

x

x

x

x

x

Mount Wallplate and Thermostat

• Remove the wallplate from your thermostat by pressing the re­lease tab on the bottom of the thermostat. See Figure 2.

Figure 2

• Position wallplate on wall and pull existing wires through large
opening. Then level for appearance. Mark holes for plastic an­chors provided, if your existing holes do not line up with those
on the wallplate.

• Drill holes with 3/16” bit and gently tap anchors into the holes
until flush with wall.

• Reposition wallplate to wall, pulling wires through large open­ing. Insert mounting screws provided into wall anchor and
tighten. See Figure 3.

Figure 3

NOTE: 5-wire Systems

If your thermostat has one wire marked R or Rh (2, 3, or 4-wire
system), then leave the jumper wire between the Rh and Rc termi­nals on the wallplate. Otherwise, if you have separate Rh and Rc
wires (5-wire system), then remove the jumper wire between the
Rh and Rc terminals.

Connect Wires and Mount Thermostat to
Wallplate

• Match and connect the labeled wires to the appropriate coded
terminal screws on the wallplate. (See Figure 4, 5.) Ignore any
wires which may be present, but which were not connected to
the old thermostat.

Figure 4 Figure 5

• Refer to the Wiring Diagrams below to be sure your system is
wired correctly.

• Be sure to tighten the terminal screws securely , otherwise a loose
wire could cause operational problems with your system or ther­mostat.

• Push excess wire back into the hole to prevent interference when
installing the thermostat to the wallplate.

• Make sure the System Switch is set to OFF , and the Fan Switch is
set to AUTO.

• Insert the tabs on top of the thermostat body into the slots at
the top of the wallplate. Press the bottom of the thermostat
body into the snap on the bottom of the wallplate. Refer to
Figure 2. (NOTE: Do not force the thermostat onto the wallplate,
as the terminal pins may be damaged. If it does not snap prop­erly, the thermostat may not work.)

• Insert the two AA size alkaline batteries, observing the polarity
marked inside the battery compartment.

• Switch on the main power at the panel or furnace.

Form No. 41497-01 Rev 6-29-2001

Wiring Diagrams

Wallplate
Terminals

Fan
Relay

Wallplate
Terminals

Fan
Relay

Wallplate
Terminals

Wallplate
Terminals

Fan
Relay

Wallplate
Terminals

Fan
Relay

X - No Connection

4-wire Heat/Cool System

Jumper

Heat Relay
or Valve

Cool
Contactor

Heat/Cool
24V Supply

5-wire Heat/Cool System

No Jumper

Heat Relay
or Valve

Cool
contactor

Heat 24V
Supply

2-wire Heat Only System

Jumper

Heat Relay
or Valve

Heat 24V or
Millivolt Supply

3-wire Heat Only System

Jumper

Heat Relay
or Valve

Heat 24V
Supply

3-wire Cool Only System

Jumper

Cool
contactor

Cool 24V
Supply

Cool 24V
Supply

Selector Switches

In order for this thermostat to control your system, the system type
must be specified by the selector switches on the printed circuit
board inside the thermostat. There is also a selector switch for your
choice of Fahrenheit or Celsius temperature display.

• Heating System Selector (HG - HE switch)
The factory position for this switch is in the “HG” position.
Leave it in this position if you have a gas furnace or an oil burner.
If you have an electric furnace, test to see whether the Heat
and Fan come on as expected after installation. If the Fan op­eration is normal, leave it in the “HG” position. If the Fan does
not come on within a minute of the thermostat calling for heat,
change the switch position to “HE”. The system selector has no
effect in the cooling mode.
NOTE: “HG” position is for gas and most other systems. “HE”
position is for certain electric systems having a fan relay.

• F° / C° selector (Fahrenheit / Celsius)
Your thermostat is set for F° mode from the factory. In order to
change to C° mode, slide the switch to C° and press the reset
button on front of the thermostat with a paper clip.
NOTE: Unless the reset button is pressed, the thermostat will
not change temperature mode.

Temperature Display
(SW4)

Fan Option
(SW3)

Figure 6

OPERATION

Start-up

The LCD will show the factory de­fault display of 70°F (21°C) when
batteries are first installed, or after
the Reset button is pressed. The
temperature will update after a few
seconds.

System Selector Switch

The System Selector switch on the front of the
thermostat determines the operating mode of
the thermostat. You may select COOL, OFF,
HEAT.

NOTE: Anytime you install or remove the ther­mostat from the wallplate, slide the System Se­lector to the OFF position to prevent the possi­bility of a rapid system On-Off.

Fan Switch

The Fan switch should normally be located in
the AUTO position. The Fan will be turned on
along with normal 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. For electric heat and air conditioning op­eration, the Fan will turn on with the system.

To run the Fan on continuously, slide the Fan
switch to the ON position.

Review Current Set Temperature

• Press either the up or down key for less than 1 second to see
the Set Temperature.

The factory default is 68°F (20°C) when started with the System
Switch Off or Heat, and 78° (26°C) when started with the System
Switch on Cool.

Setting New Temperature

• Press either the up or down key and hold
for longer than 1 second.

• The display
will flash to
show that
you are in
Set Tem­perature
mode, then
you can re­lease the key.

• Press either up or down again to change to
your desired Set T emperature. Hold the key
down for over 2 seconds to fast-advance
the Set Temperature.

The display will return to the normal room tem­perature after the keys have been released for
3 seconds.

Filter Monitor

The thermostat counts the number of hours your system’s filter has
been in use. To maximize your system’s performance and energy
efficiency, change or clean your filter regularly.

When the total system run time for
heat and cool reaches 400 hours, the
Filter Change Indicator will flash as
a reminder to check your system’s
filter.

After changing or cleaning the sys­tem filter, press and hold the Filter
key for 3 seconds. The display will
blink, and the counter will be reset to zero.

Note: Pressing the Filter key at any time for less than 3 seconds will
cause the Filter Change Indicator to appear on the LCD. This is only
to confirm key operation, and the counter is not affected unless
the key is held for greater than 3 seconds.

SPAN Setting

Your thermostat is set at the factory to cycle at 1°F (0.5°C) above
and below the set temperature. (Span = 2) This setting has been
designed to provide a comfortable room temperature under most
all conditions. However, if you find your system cycling too fast or
too slow, then the Span can be adjusted to modify the cycle time.

The Span settings remain the same for both HEAT and COOL, and
can be changed in any System Switch position.

When batteries are installed in the thermostat, or the Reset key is
pressed, the Span is reset back to setting 2.

• Press and hold BOTH for three seconds. The
display will flash, and SPAN will be displayed
on the LCD.

• Press to raise the Span to 3. This setting
INCREASES the cycle time by allowing your
system to run LONGER.

• Press to lower the Span to 1. This setting
DECREASES the cycle time by causing your
system to run SHORTER.

Low Battery Warning

Your thermostat has a two-stage low
battery warning system. When the
batteries are first detected to be
weak, the first stage low battery
warning is indicated by battery sym­bol flashing on the LCD display. At
your earliest convenience, you need
to replace the batteries with 2 new AA alkaline batteries.

When the batteries become too weak for normal operation, the
thermostat enters the second stage low battery warning which shuts
down the thermostat. In this condi­tion, “BATT” flashes alone on the
display, and the thermostat will turn
your system Off. Your system will
remain shut-off until the batteries
are replaced.

Note: The thermostat will still keep
the current Set Temperature and Fil­ter run time in memory until new batteries are installed. After con­firming that new batteries have been inserted, the thermostat will
return to normal operation.

Error Mode

If the thermostat is unable to con­trol your system due to an unex­pected battery problem, the thermo­stat will enter Error Mode. In this
condition, the thermostat flashes
“Er” on the LCD display, and shuts
off your system.

To correct this problem, replace the batteries with 2 new AA alka­line batteries, even if you have recently replaced them. Next, use a
paper clip to press the RESET button next to the keypad. You will
need to reprogram your thermostat and confirm normal opera­tion.

If Error Mode returns, please call Technical Support at 1-888-830­1326 for further information.

Auto Cut Off

Your thermostat will automatically cutof f in Heat mode if the r oom
temperature rises above 95°F (35°C). It will cutoff in Cool mode if
the room temperature drops below 45°F (7°C).

Note that if your system has malfunctioned and no longer responds
to thermostat controls, the Auto Cut-Off will have no effect.

TROUBLESHOOTING
Problem

No Display.

Entire Display
Dims.

Auto Fan Does Not
Turn On Properly.

Heating or Cooling
Does Not Go On
or Off.

Erratic Display.

If unit continues to
operate in the Off
position.

Thermostat perma­nently reads “HI”,
“LO”, or “Er”.

If you experience any other problems, call 1-888-830-1326 from 8
AM to 5 PM Central Time for technical assistance.

Ask Your Local Retailer for Other Quality Products from Hunter.

Solution

1. Check battery connections and
batteries.

2. Press RESET button with a small pin
and hold in for two seconds.

1. Replace Batteries.

1. Move HG/HE selector to correct
position.

1. Check that the function switch is in
the correct position (“HEAT” or
“COOL”).

2. There may be as much as 4-minute
delay before the system turns On ­wait and check. (Compressor
protection delay.)

3. Check your circuit breakers and
switches to ensure there is power to
the system.

4. Replace batteries.

5. Make sure your furnace blower door
is closed properly.

6. If your system only uses 4-wires, be
sure the jumper wire is installed
between the Rc and Rh terminals.

1. Press the reset button once with a
small pin and hold for two seconds.
Then reprogram.

1. Replace unit.

1. Replace unit.

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© 2001, Hunter Fan CompanyForm No. 41497-01 Rev 6-29-2001