Computime Limited AAHZT21 ユーザーズマニュアル
July 5, 2012
Page 16 of 49
66 8003 002-7
4. Device installation and commissioning
The Orion EMS thermostat is a low voltage (12-24V AC / 15-24V DC) device and the air handler to which it is
installed must have a low voltage interface. If no low voltage interface exists, one supplied by the distributor or
another qualified installer must be installed. The thermostat may be connected on air handlers with either standard
(on/off) control or heat pump control.
Important:
Do not connect the Orion EMS thermostat directly to high voltage as this will destroy the thermostat.
4.1 Inputs / outputs
Table 3 shows the inputs and outputs for the Orion EMS thermostat which are connected via the wiring harness
supplied with the thermostat.
supplied with the thermostat.
Note:
Connect input voltage 12-24V AC or 15-24V DC to pins 13 and 14.
Note:
If a thermostat controller is used, the wiring harness is connected at the front of the thermostat controller as
shown in Figure 11.
Note:
If no thermostat controller is used, the wiring harness is connected at the back of the thermostat as shown in
Figure 12.
Pin
Input / Output
Wire Color
1
W/W2: Heating (output)
White
2
Y/W2: Cooling/Compressor (output)
Yellow
3
G1: Fan 1/low (output)
Green
4
G2: Fan 2/medium (output)
Orange
5
G3:Fan 3/high (output)
Dark blue
6
RV: Reversing valve (output)
Violet
7
Extra output: not used
Brown
8
DS_I: Interior door switch (input)
Gray
9
DS_E: Exterior door switch (input)
Orange/blue
10
EX1: Extra input 1 (motion sensor/
card switch I/O)
card switch I/O)
Pink
11
GND: Power – Common/Ground
Black
12
V+ (load max 50mA DC)
White/black
13
C: Power input -
Light blue
14
R: Power input +
Red
Figure 10: Wire colors of wiring harness
PIN1
Table 3