3 of 13
Product
Instructions
PI-PR 566440 0114 (Programmable Heat-Cool Thermostat)
Viega LLC, 301 N. Main, 9th Floor • Wichita, KS 67202 • Ph: 800-976-9819 • Fax: 316-425-7618
Thermostat wiring
1. If you are replacing a thermostat, make note of the
terminal connections on the thermostat that is being
replaced. In some cases the wiring connections will
not be color coded. For example, the green wire
may not be connected to the G terminal.
2. Loosen the terminal block screws. Insert wires then
retighten terminal block screws.
Viega thermostat terminal conversion
Power type
•
3 wire
•
3 wire with battery backup
•
2 wire with battery
Terminal designations
W - Heat relay
Y - Compressor relay
G - Fan relay
O - Heat pump changeover valve energized in cooling
RC - Transformer power for cooling
RH - Transformer power for heating
B - Heat pump changeover valve energized in heating
C - Common wire from secondary side of cooling
system transformer
Wiring tips:
RH & RC terminals
For single transformer systems, leave the jumper wire in
place between RH and RC. Remove jumper wire for two
transformer systems.
Heat pump systems
If wiring to a heat pump, use a small piece of wire (not
supplied) to connect terminals W and Y.
C terminal
The C (common wire) terminal does not have to be
connected when the thermostat is powered by batteries.
Wire specifications
Use shielded or non-shielded 18-22 gauge thermostat wire.
Caution: Electrical hazard
Failure to disconnect the power before beginning
to install this product can cause electrical shock or
equipment damage.
Warning:
All components of the control system and the
thermostat installation must conform to Class II circuits
per the NEC Code.
RH
C
W
RH
C
W/E
L
N
R
C
W
Thermostats
15116
15117
Thermostat
15118
Zone Control
18060
18062
18050
Zone Control
18032
Thermostat
18029
