Replacement installations
Replacement installations
For replacement installations, mount the IS-ZW-STAT-100 in place
of the existing thermostat. You must have a “C” wire or other 24
VAC power available at the IS-ZW-TSTAT-100 location. A new
location will require moving your wiring.
For replacement installations, mount the IS-ZW-STAT-100 in place
of the existing thermostat. You must have a “C” wire or other 24
VAC power available at the IS-ZW-TSTAT-100 location. A new
location will require moving your wiring.
To remove the old thermostat:
To remove the old thermostat:
1. Switch off electricity to the furnace and air conditioner.
1. Switch off electricity to the furnace and air conditioner.
2. Remove the cover from the old thermostat.
2. Remove the cover from the old thermostat.
Most are snap-on types and simply pull off. Some have
locking screws on the side or front. These must be loosened.
Most are snap-on types and simply pull off. Some have
locking screws on the side or front. These must be loosened.
3. Do not remove the wires. Note the letters printed near the
terminals.
3. Do not remove the wires. Note the letters printed near the
terminals.
4. Attach labels (enclosed) for each wire for identification.
4. Attach labels (enclosed) for each wire for identification.
Read the instructions carefully before removing any wiring
from the existing thermostat. There is no standard color code
for the wires. When removing wires from their terminals,
ignore the color of the wires and label them by the terminal
where they were connected.
Read the instructions carefully before removing any wiring
from the existing thermostat. There is no standard color code
for the wires. When removing wires from their terminals,
ignore the color of the wires and label them by the terminal
where they were connected.
Label the wires one at a time. You must label all of the wires
before you proceed. This may require you to find the “other
end” connection for each wire on your heating or air
conditioning equipment and read the label there. See “ top
and bottom cover sections.
Label the wires one at a time. You must label all of the wires
before you proceed. This may require you to find the “other
end” connection for each wire on your heating or air
conditioning equipment and read the label there. See “
Wiring” below for information on wire labels from different
HVAC system makers.)
Wiring” below for information on wire labels from different
HVAC system makers.)
5. With all wires labeled, remove them from the old unit.
5. With all wires labeled, remove them from the old unit.
Make sure the wires do not fall back inside the wall. You can
wind them around a pencil to keep them from falling (see
Figure 2 below).
Make sure the wires do not fall back inside the wall. You can
wind them around a pencil to keep them from falling (see
Figure 2 below).
6. Loosen all screws on the old thermostat and remove it from
the wall.
6. Loosen all screws on the old thermostat and remove it from
the wall.
Figure 2: Label wires
Figure 2: Label wires
top
and bottom cover sections.
Note:
A C wire or 24 VAC power is required for the IS-ZW-TSTAT-
100 to operate. If you do not have a C wire, you can run a new
wire from the HVAC to the IS-ZW-TSTAT-100.
The wire marked “C” will allow your thermostat to power up. If you
do not connect or have a “C” wire, you can run a new wire from
the HVAC to the IS-ZW-TSTAT-100. Battery power is designed for
power loss backup and not the primary power source. If you do
connect the C wire to the thermostat, this will extend battery life.
See “Wiring” on page 3 for details on the different types of HVAC
wiring your system may have.
Prepare the wires
Use the following guidelines for safe and secure wire connections:
•
You will need at least 2.6 in. of wire for each of your
connections to the IS-AW-TSTAT-100. If you do not have
enough wire, splice additional wire to allow enough slack.
•
Remove insulation 1/8 in. from the tip of each wire.
•
Take care not to damage the wire labels when you handle the
wires.
•
Do not allow wires to touch each other or other parts on the
thermostat.
•
Fan out the wires below the wall opening (see Figure 3 below)
so that the C wire is above the C terminal, the W above the W
terminal, etc. This allows the thermostat to fit snug to the
wall.
•
Position the wires behind the thermostat and up over the
terminal area. Do not bunch wires behind the thermostat.
Feed any slack back into the wall opening.
Figure 3: Prepare wires
From furnace
C
W
Y
RH
G
2.6 in.
To connect the wires:
1. Connect the labeled wires only to a terminal with the same
letter label.
2. Insert the wire in the terminal well and tighten the screw
securely.
Do not over-tighten (this could cut the wire).
To mount the thermostat to the wall:
1. Remove the top and bottom cover sections on the front of the
thermostat to expose the mounting holes.
2. Hold the thermostat against the wall, with the wires coming
over the top above the terminal block.
The thermostat will cover the hole in the wall. Position the
thermostat for best appearance.
3. Attach the thermostat to the wall with the screws provided.
Mark first, and then drill a 3/16 in. (4.8 mm) hole for the insert
at each screw location, then mount the thermostat.
If you are mounting the thermostat to sheet rock or if you are
using the old mounting holes, use the plastic anchors
provided.
4. Replace the top and bottom cover sections.
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P/N 1069534 • REV A • ISS 17MAR10
