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4
PG 4
What wires do you have?
Make sure your wires are labeled. This may require you to nd the ‘other end’ connection for each
wire on your heating or air conditioning equipment and read the label there. Refer to the Wire
Reference page 13 for better understanding of wire labels from different HVAC system makers.
IMPORTANT: C wire or 24VAC power is required for the LS-90 to operate. If you do not have a C
wire you can run a new wire from the HVAC to the LS-90 or provide 24VAC power to operate the
LS-90 using a standard 24VAC wall transformer.
IMPORTANT: If you have both RH and RC you need to
remove the metal jumper-clip between these 2 terminals.
IMPORTANT: If you have both O and B you must check
Prepare wires
Please follow these guidelines for safe and
secure wire connections:
• You will need at least 2.6” of wire for each of your connections to the LS-90.
• If you do not have enough wire, splice additional wire to allow enough slack.
• Fan out wires below the hole as shown.
• Remove insulation 1/8” from the tip of each wire.
• Take care not to damage the labels for each wire in handling.
G
C
Y
RH
W
2.6"
Screw terminal
from furnace
page 13 for wiring info.
Jumper
Clip
5
PG 5
• Fan wires out as illustrated with LS-90 below the
wall opening. As in the example: fan out the wires so
that the C wire is above the C terminal the W above
the W. This allows the LS-90 to
t snug to the wall.
• Wires will position behind the LS-90 and up over the
terminal area.
• Do not bunch wires behind LS-90. Feed any slack
back into the wall opening.
Connect your wires
• Connect labeled wires only to a terminal with the
same letter label.
• Insert the wire in the terminal well and tighten the screw securely.
• Do not over-tighten, this will cut the wire.
• If a 24VAC transformer [Radio Shack PN273-1690] is used, connect to the C and RH terminals (no
polarity).
Caution
F
ro
m
F
u
rn
ace
G
RH
Y
W
C
Do not allow wires to touch each other or parts on
thermostat.