ClimateMaster ET Series Installation, Operating, & Maintenance Instructions
Electronic Thermostat
Installation, Operating &
Maintenance Instructions
ET Series
Page 1
GENERAL INFORMATION
Introduction
This Installation, Operation and Maintenance Manual is
for Climate Master ET Series Electronic Thermostats.
ClimateMaster ET Series Thermostats are typically
factory programmed per application requirements and
Model Number Digits
12 3 45678 9101112 13 14 15
ET A N 1 B C A M F N A R S C
DIGIT 3 - CONFIGURATION
A ACO, no fan on/auto switches
B ACO w/ fan on/auto switches
C ACO w/ 3 fan speeds
D ACO w/ 3 fan speeds & fan on/
auto switches
E MCO, no fan on/auto switches
F MCO w/ fan on/auto switches
G MCO w/ 3 fan speeds
H MCO w/ 2 fan speeds & fan on/
auto switches
J ACO w/ 3 fan speeds & override
K MCO w/ 2 fan speeds & override
L No buttons
Options "C", "D", "G", "H", "J",
"K" to be used with multi-speed
CMC boards.
shipped under separate cover. No special subbase is
required. An optional ClimateMaster remote sensor is
shipped separately.
Each thermostat has a 15 digit model number printed on
the backplate which identifies thermostat features. Refer
to the decoder below to determine the features provided
DIGIT 14 - SENSOR TYPE
N Room sensor
S Room sensor & 5 minute
anti short-cycle
F Remote sensor - 78"
T Remote sensor & 5 minute
anti short-cycle - 78"
G Remote Sensor - 50'
U Remote Sensor & 5 min.
anti-short cycle - 50'
DIGIT 13 - DRIVE OUTPUT
B Relays & communication
R Relays only
C Communication only
DIGIT 4 - OVERRIDE B
N None
O Override button
Not available when digit 3
is "D", "G", "H"
DIGIT 5 - # OFSTAGES
1 One stage
2 Two stage (CMC style
units only)
DIGIT 6 - EMERGENCY
OVERRIDE SETPOINT
N None
50°F (10°C)
H
80°F (27°C)
C
B50°F (10°C) Heating &
80°F (27°C)
E50°F (10°C) Heating &
88°F (31°C)
DIGIT 7 - TEMPERATURE
A None
68°F (20°C)
B
78°F (26°C)
°
C68
78°F (26°C)
J65
°F (18.3°C) Min on cooling &
80°F (26.7°C) Max on heating
Heating only
Cooling only
Cooling
Cooling
SETPOINT LIMITS
Max on heating &
Min on cooling
F (20°C) Min on cooling &
Max on heating
A Ambient temperature display/
DIGIT 8 - DISPLAY
Press setpoint for setpoint display
B Setpoint display/ Press setpoint for
ambient display
C Setpoint only
D Ambient only
DIGIT 12 - OUTPUT DIRECTION
A Y= Cool, W= Heat
O Y= Comp, W= Rev. Valve on Cooling
B Y= Comp, W= Rev. Valve on Heating
DIGIT 11 - FAN MODE
N Normal (Auto Fan, cycling)
C Continuous fan with power on
H Auto fan on heating, continuous
fan on cooling
DIGIT 10 - TEMP MODE
F Fahrenheit
C Celsius
Field selectable
DIGIT 9 - SETBACK FROM SETPOINT
Setback Only Setup and Setback
N None
C2 F° (1.11 C°)
E4 F° (2.22 C°)
G6 F° (3.33 C°)
J 8 F° (4.44 C°)
M 10 F° (5.56 C°)
R 12 F° (6.67 C°)
T 14 F° (7.78 C°)
V 16 F° (8.89 C°)
N None
B2° F (1.11 C°)
D4° F (2.22 C°)
F6° F (3.33 C°)
H8° F (4.44 C°)
K10° F (5.56 C°)
P12° F (6.67 C°)
S14° F (7.78 C°)
U16° F (8.89 C°)
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with the ET Series thermostats to be installed in your
application.
NOTE: Some options are available only when the
HVAC unit controlled utilizes a ClimateMaster
CMC-2000 Series controller board.
Overview
The ClimateMaster ET Electronic thermostat is intended
for 24 Volt control of heat pumps and conventional
heating and cooling equipment. The thermostat can be
used with standard electromechanical units or with
ClimateMaster units equipped with CMC-2000 Series
Controllers.
Throughout this document, the term UNIT is used to mean
the HVAC unit controlled by the thermostat.
Specifications
The following are general operating parameters and
specifications for the ET Series Electronic Thermostat:
Operating Environment: 0° F (-17.7° C) to 140° F
(60° C) with 5% to 95% relative humidity,
non-condensing.
Storage Environment: 0° F (-17.7° C) to 140° F (60° C)
with 5% to 95% relative humidity, non-condensing.
Power Requirements: 24Volts AC, .14 amps, 50/60 HZ.
Physical Dimensions: The thermostat is 4.6" (11.7 cm)
wide by 4.6 (11.7 cm) high by 1.2" (3 cm) deep. It can be
mounted: on a vertical or horizontal 2"x4"junction box,
or directly on the wall surface.
Relay Ratings: The thermostat relay contacts are rated at
2 amps at 24 Volts. (Terminals are R, Y, W, G, low and
medium.) (Supplied only with "B" or "R" in position
13.)
Serial Port: The thermostat is equipped with a RS-485
standard serial port. Terminals are +N, - N, SHI.
Connections: A terminal strip is provided for Class II
low voltage.
OPERATION
Mode of Operation: The thermostat can be ordered
factory programmed with many operating options for
either Manual Changeover Operation (MCO) or
Automatic Changeover Operation (ACO).
It can also have features which only work when applied
to a unit equipped with a ClimateMaster CMC-2000
Series Controller Board. Each of the eight standard
factory programmed variations is shipped with a custom
faceplate for ease of use.
The following describes some of the more common
operations available on the ET Series Thermostat.
Starting Operation: The HVAC unit is turned on by
pressing the "POWER" button on the thermostat. When
pressed, an LED on the front panel is illuminated.
Thermostat Display: The thermostat can be field
selected to display temperature in either Fahrenheit (°F)
or Celsius (°C). It can also be factory programmed to
display as standard either ambient temperature or
setpoint temperature.
Standard setpoint temperature display may be temporarily masked for five (5) seconds by ambient temperature by pressing both the temperature "UP" and
"DOWN" buttons simultaneously. Standard ambient
temperature display may be temporarily masked for five
(5) seconds by setpoint temperature by pressing either
the temperature "UP" or the temperature "DOWN"
buttons. Display is switched back to standard display
automatically within two (2) seconds after the buttons are
released.
Setpoint temperature display is indicated by a setpoint
indicator dot on the temperature display.
Fan Operation: Fan "AUTO/ON" buttons select whether
the fan runs continuously or if it cycles with the
compressor. A red LED illuminates to indicate the option
selected. When no fan switches are provided on the
thermostat, the fan operation is as specified in the model
number decoder.
Multi-speed Fan Control: When the thermostat offers
multi-speed fan speed control for units with
electromechanical controls and three speed capability,
then high speed connects to G1, medium speed to
"MED" and low speed to "LOW".
See the CMC-2000 Series Installation, Operation and
Maintenance Manual for more information on fan speed
control.
MCO Operation: When the thermostat is factory
programmed with an MCO option it must be manually
set to either heating or cooling. MCO thermostats have a
"HEAT" and a "COOL" button. The MCO thermostat can
be equipped with or without fan switches or with either
automatic or two speed fan operation.
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