Pentax RTH1100 Installation Instructions
Quick Installation Guide
69-2446EF-01
RTH1100
Non-Programmable Thermostat
Quick Installation Guide
Identify System Type
This thermostat is compatible with the following systems:
Gas, oil or electric furnace•
Central air conditioner•
Hot water system with or without pump•
Millivolt system•
Central heating and cooling system•
Gas fireplace•
Do you need assistance?
We are here to help.
Call 1-800-468-1502.
This thermostat works on 24-volt or 750-mV systems.
It will NOT work on heat pump systems, multistage
systems or 120/240-volt systems.
69-2446EF—01 ii
Turn Off Power to Heating/
M28097
1
Cooling System
RT H110 0
1 69-2446EF—01
Quick Installation Guide
M28099
Remove Old Thermostat
2
Remove old thermostat but leave wallplate with
wires attached.
MERCURY NOTICE
Do not put your old thermostat
in the trash if it contains
mercury in a sealed tube.
Leave wallplate
in place
Old thermostat
Contact your local waste
management authority for
instructions regarding recycling
and proper disposal.
Cover
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RT H110 0
M29988
Identify Wires
3
If any wires are not attached to your old thermostat or are
attached to a terminal marked C or C1, they will not be
connected to your new thermostat. Wrap the bare metal
end of each of these wires with electrical tape, so it cannot touch and short other wires.
Do not use non-connected
wires.
Do not use C or C1 wires.
Identify and label each wire.
IGNORE WIRE COLORS:
Use terminal screw
designations to identify
wires.
Disconnect wires and remove the old wallplate only after
all wires are labeled. Wrap the wires around a pencil to
prevent them from falling though the wall opening.
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Quick Installation Guide
Separate Wallplate from New
4
Thermostat
Mount the new wallplate using the included screws
and anchors.
Remove cover 1.
plate.
Loosen screw 2.
(the screw
remains captive
on wallplate).
Revove 3.
thermostat.
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Mount Wallplate
M29989
5
Mark and drill appropriate mounting holes.1.
Insert Plastic anchors.2.
Pass wires through opening of wallplate and secure 3.
wallplate to the wall using provided screws.
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Quick Installation Guide
Rh Rc W Y G
M29990
Connect Wires (typical wiring)
6
Match each labeled wire with the terminal having the 1.
same letter.
Remove jumper if
you have both R
and Rc wires.
Loosen the terminal screws using a screwdriver, insert 2.
the wires, then lighten the screws.
Push any excess wire back into the wall opening.3.
Labels don’t match?
If a wire does not match any terminal designation, see next page.
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Rh Rc W Y G
M29991
Connect Wires (alternate wiring)
6
If labeled wire does not match any terminal designation, see
diagram below.
Do not use C, X or B. Wrap bare end of wire with
electrical tape.
If wires are connected to both Rh and Rc terminals,
remove jumper (see previous page).
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Quick Installation Guide
M29992
Set Heating Fan Control
7
Set jumper, on the back of the thermostat, if you have
connected a wire to the G terminal.
HG
HE
Incorrect jumper setting: An incorrect setting is noticeable in a gas or oil heating system. When heating starts,
you will initially feel cold air coming out of the vents as
the fan is running before the furnace has enough time to
heat up the air.
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Leave the jumper
in this factory-set
position if you
have a gas or oil
furnace.
Place the jumper
to this position if
you have an electric furnace.
Jumper
Install Batteries
M29993
8
Pull out the battery cover. 1.
Install two AA alkaline batteries.2.
Reinstall the battery cover.3.
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Quick Installation Guide
M29994
Install Thermostat onto Wallplate
9
Mount the thermostat 1.
on the wallplate.
Tighten the screw 2.
and install the cover
plate.
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RT H110 0
M28098
10
Turn the power back on to the heating/cooling system.
Turn Power Back On
11 69-2446EF—01
Quick Installation Guide
11
If your system type is:
q Single Stage Standard Forced Air Heat and Cool
If your system type is...
Congratulations, you’re done!
If your system type is:
q Hot Water Heat
q Steam or Gravity Heat
q High Efficiency Forced Air
Continue with advanced installation
on page 13 to match your thermostat to your sytem type.
If you are not sure of your system type or if you have other
questions, call us toll-free at 1-800-468-1502.
This thermostat works on 24 volt or 750 mV systems. It will NOT
work on multi-stage heating and cooling systems, multi-
stage heat pump systems, or 120/240 Volt systems.
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Advanced Installation
System setup ......................................................................14
Temperature display ...........................................................15
Heating cycle rate ..............................................................16
Troubleshooting ..................................................................18
Customer assistance .........................................................20
Limited warranty .................................................................20
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