Product Overview

2 of 10
Product
Instructions
PI-PR 566490 0514 (Zone Valve)
Viega LLC, 301 N. Main, 9th Floor • Wichita, KS 67202 • Ph: 800-976-9819 • Fax: [phone]
1 2
Mounting the powerhead to the zone valve
1. Connect the adapter ring to the zone valve, hand
tighten only.
2. Place the powerhead over the adapter ring and
push down firmly.
NOTE: To remove the powerhead push in on the square
tab and pull up. With the powerhead separated from the
from the zone valve, the zone valve will remain in the
normally open position.
C C RW NTC A/B
Thermostat -18050
Class II
Transformer
C
R
120 V AC
Power Supply
N
L
Viega
Red
Red
Yellow
Yellow
TO T-T BOILER CONTACT, PUMP
RELAY OR OTHER AUXILIARY
DEVICE REQUIRING CONTACT
CLOSURE.
Line Voltage
Low Voltage
LEGEND: Zone Controls
1. Connect a yellow wire from
the zone valve powerhead
to the C terminal on the
digital thermostat.
2. Connect the other yellow
wire from the zone valve
powerhead to the W
terminal on the thermostat.
3. The red wires can be
connected to the boiler
contact (TT), pump relay
or other auxiliary device
requiring contact closure.
4. Connect the C terminal
from the transformer to
the C terminal on the
thermostat.
5. Connect the R terminal
from the transformer to
the R terminal on the
thermostat.
Wiring the zone valve powerhead to a Viega digital thermostat 18050