Computime Limited AAHZT21 ユーザーズマニュアル
July 5, 2012
Page 21 of 49
66 8003 002-7
4.3.1.1 Thermostat placement
If there are no existing thermostats, a few important items should be considered in determining placement:
•
Do not mount the thermostat in the direct air flow of the air handler.
•
Do not mount the thermostat in direct sunlight.
•
Do not mount the thermostat directly above or behind any heat generating device such as a light or a TV.
•
Generally, the thermostat should be mounted about 1.5m (5 feet) above the floor for standard rooms;
however, local codes must be followed.
however, local codes must be followed.
Note:
When applicable, also follow local handicap requirements.
4.3.1.2 Thermostat battery exchange
To exchange the batteries in the thermostat, remove the thermostat according to section 4.3.1 and exchange the
batteries (3 AA) in the battery package.
batteries (3 AA) in the battery package.
4.3.2 Wiring a thermostat
4.3.2.1 Recommended wire specification
It is recommended to use 0,82 – 0,33 mm
2
/ 18 – 22 AWG (equivalent) solid copper wire (Plenum rated if
required by local code) from the thermostat to the HVAC system or line to low voltage interface. The same
can be used if installing a wired door switch. The number of conductors to the HVAC system will depend
on the particular installation. A 2-conductor wire is required for the wired door switch.
can be used if installing a wired door switch. The number of conductors to the HVAC system will depend
on the particular installation. A 2-conductor wire is required for the wired door switch.
4.3.2.2 Connecting a thermostat
The wires of the wiring harness (Figure 10) are to be connected to the low voltage thermostat inputs of the
air handler. These include heat, cool, three fan speeds and the reversing valve (heat pump only).
air handler. These include heat, cool, three fan speeds and the reversing valve (heat pump only).
Note:
If connecting to an air handler that has only two fan speeds, connect the low fan to the Fan 1 output
and the high fan to the Fan 2 output. If the air handler has only one fan speed, connect to the Fan 1 output.
Important:
If connecting to a high voltage air handler, a line to low voltage conversion kit must be used.
W/W2 (white)
For standard systems, this controls HEAT. For heat pumps, this is
connected to the Stage 2 heating element if applicable.
connected to the Stage 2 heating element if applicable.
Y/W2 (yellow)
This controls the COOL function for standard control and the Compressor
for heat pump control. (For heat pumps, this is Stage 1 heating).
for heat pump control. (For heat pumps, this is Stage 1 heating).
G1 (green)
This controls fan speed 1 (low).
G2 (orange)
This controls fan speed 2 (medium).
G3 (dark blue)
This controls fan speed 3 (high).
RV (violet)
This controls the reversing valve (heat pump only). The logic is set by
the configurable parameters when the thermostat is commissioned.
the configurable parameters when the thermostat is commissioned.
Power - Common / Ground (black)
Power (red)
12-24V AC
15-24V DC
Table 4