Sensaphone 800 - Manual (Page 112)

Sensaphone
®
Model 800 User’s Manual
110
preferred “home” temperature. With your Sensaphone 800, you
will be able to switch between these two thermostats using the
relay output.
Ideally, the “away” thermostat would be in your pump or furnace
room. Remember that your “away” thermostat will be the only
thermostat that keeps your cottage or cabin at minimal heat while
you are away. It should not be located near a window or where
direct sunlight might warm it, near a furnace radiator or vent, or
any heat source such as a pilot light.
The second thermostat, the one pre-set for your preferred
temperature when you arrive at your cottage or cabin, should be
located in your normal living space. This would likely be your
existing thermostat, already located in a suitable location by your
heating professional at the time your furnace was installed.
By connecting these two thermostats together in a parallel
fashion, and by passing the low voltage supply through the
Sensaphone (See Figure 1), you can remotely or locally decide
which thermostat is in control of your furnace.
It is recommended that the “away” thermostat be connected to the
NC (Normally Closed) terminal while the “home” thermostat be
connected to the N0 (Normally Open) terminal of the Sensaphone.
This way, it’s easy to understand which state your furnace is in:
Output ON = Home and Output OFF = Away. The supply voltage
from your furnace (typically the wire labeled R or 24VAC),
should always be connected to the C (Common) terminal on the
800.
1 C
ZONES
2 C 3 C 4 C 5 C 6 C 7 C 8 C NO C NC
FURNACE
70º F
21º C
50º F
10º C
Home
Thermostat
Away
Thermostat
24 VAC
Transformer
Figure 1: Dual Thermostat Setup