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44
Remote Wall Mounted Thermostats
Remote Thermostat
Control
The EZGS can be controlled by any remote electronic
thermostat that can interface with RCBWYG terminals.
The Control Selection jumper must be in T’STAT posi-
tion. During a call, the remote thermostat will pass R
back to the controller on a respective terminal. The push
buttons on the touchpad become inactive in the remote
thermostat mode; error codes will display as normal on
the touchpad display.
Note: In terms of outputs, there are two types of thermo-
stats; Relay Contacts and Solid State.
Manufacturers of solid state output thermostats include
loading resistors in their installation kits. These 560
Ohm, 3W resistors are meant to load thermostat solid
state outputs in order for the output voltage to be either
0 or 24 Vac (i.e., no floating voltage). These resistors are
connected from W, Y, G to common (C), respectively.
You can wire any type of 24 Vac thermostat straight into
the Remote Thermostat Interface on the PTAC control
board (see page 45).
Wireless Wall Thermostat
Wireless wall thermostats are designed to provide precise
temperature control without the installation labor and
expense of wiring.
• Powered by AA batteries.
• Mounts in any suitable location that will provide an
accurate room temperature reading.
• Large LCD display provides the user with current
room temperature, set point temperature, time, pro-
gram interval, and other system status information.
Remote Control Node
Used with a wireless wall thermostat, the RCN commu-
nicates with the thermostat using unlicensed 9.00 MHz,
radio frequency energy.
Energy Saving Options
Automatic Change-Over Remote Mounted Thermostats
can be obtained to switch from heating to cooling and
from cooling to heating automatically. With automatic
change over, the operation of the heating cycle or the
cooling cycle is determined by the temperature require-
ment of the space.
Most thermostats with this feature are set to change
over when the room temperature varies 3-
½
°F from the
set point. The unit is placed in the cooling mode when
the set point is over 3-
½
°F; 3-
½
°F under the set point
places the unit in the heating mode. This 3-
½
°F varia-
tion is usually adjustable from a
½
°F dead band to a
5 °F dead band. Each cycle is run until the set point tem-
perature is reached, then that cycle is de-energized. On
some thermostats, the automatic changeover function
can be overridden manually by moving the thermostat
selector switch to “HEAT” or to “COOL.”
The fan operation, with an automatic change over ther-
mostat, is controlled by the fan selector switch. When
placed in the “FAN” mode, the fan runs continuously.
When placed in the “AUTO” mode, the fan will only
energize when the thermostat calls for heating or cooling.
System Controls and Management (
cont.
)
