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ACO Operation: When the thermostat is factory
programmed with an ACO option, it automatically changes
from heating to cooling. ACO thermostats have a
"POWER" button. The ACO thermostat can be equipped
with or without fan switches or with either automatic fan or
three speed fan operation.
Emergency Override: The ET Series Thermostat can be
ordered with a factory programmed emergency override
option. This option monitors room temperature as long as
power is available to the thermostat even when the power
button is turned "OFF".
This option may be ordered to maintain a room temperature
minimum of 50° F (10° C), a maximum room temperature
of 80° F (26.7° C) or both minimum and maximum limits.
Refer to the decoder on page 2 to determine if this option is
included with the installed thermostat.
CMC-2000 Series Operation: A thermostat intended to
operate with a unit equipped with a CMC-2000 Series
controller operates with the following unique sequences:
Multi-speed fan control is handled through the RS-485
interface between the thermostat and the controller.
When an override button is provided, the unit overrides
night setback for two (2) hours after being activated by
pushing the "OVERRIDE" button. In night setback mode,
the thermostat displays the factory programmed night
setback temperature, provided the thermostat normally
displays set-point temperature. When the override button is
WARNING
!
To prevent electrical shock or equipment damage,
disconnect power supply before installing.
The installation of the ET Series Electronic Thermostat
must be in accordance with the regulations of ALL
Authorities having jurisdiction and MUST conform to all
applicable Codes. It is the responsibility of the Installing
Contractor to determine and comply with ALL applicable
Codes and Regulations. Installer MUST be an
experienced service technician trained in the installation
of this type of equipment.
Pre-Installation
Installation, operating and maintenance instructions are
provided with each thermostat. Before start-up, read all
manuals and become familiar with the thermostat and its
operation.
Verify that the unit to be controlled by the thermostat is
installed and ready for operation.
Page 4
pressed, setpoint returns to the normal day setting for two
(2) hours. (See Night Setback on page 8 for more
information.)
Two stage Operation is provided for use with units
equipped with CMC-2000 Series Controllers. Units must be
addressed as shown in the ClimateMaster CMC-2000 Series
Installation, Operation and Maintenance Manual. The first
stage CMC-2000 Series controller must have dip switches
set to address one and the second stage controller must have
dip switches set to address two. Units must be powered
down before dip switch settings are changed. Note: The
CMC-2000 Series controller must have these dip switch
settings for two stage operation even when the thermostat is
not working with DDC communications.
When the CMC-2000 Series Controller board is equipped
with an optional fan control, the thermostat can be set at
"HI", MED" or "LOW" fan speeds. A red LED indicates
which speed is selected.
Fault Indicator: When the thermostat is used with units
equipped with a fault output, the LED light indicates that a
fault has occurred. This feature is standard on
ClimateMaster units with CMC-2000 Series Controllers
without an additional wire. It is an option on other
electromechanical equipment.
When this feature is an option, the fault wire is connected to
terminal "X" on the back of the thermostat. The fault light
operates on 24 VAC or 24 VDC.
INSTALLATION
Check the applications and correctly match the
thermostat with the unit to be controlled.
Field supply and install an optional electrical junction
box following location instructions listed below.
Determine which of the field wiring diagrams shown on
pages 6 and 7 are to be used.
Location
Install the thermostat approximately 4 feet (1.22 meters)
above the floor in an area exposed to circulating room
air of average room temperature.
The ET Series Electronic Thermostat must be installed
in accordance with the following guidelines:
• Install on an interior wall only. Do not install on an
exterior wall.
• Install out of direct sunlight.
• Install at some distance from air discharge grilles. Do
not directly expose to hot or cold discharge air.
• Install out of drafty areas and dead air spaces.
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