Temperzone SAT-‐3 Installation Setup Guide, Issue 2
Page 6
of 7
If the
key is pressed or if no key is pressed for 15 minutes the SAT-‐3 will return to
normal operation using the updated settings.
If the
button is pressed the SAT-‐3 will discard the updated settings and resume
normal operation with the previous settings.
2.3.
Commissioning Mode
To activate or de-‐activate commissioning mode hold down
and
together for
3 seconds. When commissioning mode is active the symbol
i
on the display flashes on and
off.
Commissioning mode automatically ends after 30 minutes and the thermostat returns to
normal operation. Commissioning mode also can be terminated by again pressing
and
together for 3 seconds or by removing and then re-‐applying power to the
thermostat. Operation in commissioning mode is identical to that in normal mode except
that safety timer durations are made shorter as follows:
Delay
Normal
Commissioning
Minimum compressor on-‐time
90 seconds
10 seconds
Minimum compressor off time
90 seconds
20 seconds
Minimum time from compressor-‐on to next
compressor-‐on
6 minutes
30 seconds
Minimum cooling-‐to-‐heating change-‐over time
10 minutes
1 minute
Minimum heating-‐to-‐cooling change-‐over time
10 minutes
1 minute
Power on delay prior to starting compressor
2 minutes
2 minutes
2.4.
Return Air Sensor option
To use a return air sensor with the SAT-‐3 the return air sensor must be connected to the
SAT-‐3. The SAT-‐3 provides a socket that accepts a 2 pin JST connector of the standard type
that Temperzone uses for its optional temperature sensors.
The SAT-‐3 must be configured to use the return air sensor. This is done with the
Commissioning mode settings -‐ see section 2.3 above. The options for selecting the
controlling sensor are:
1 = internal, 2 = external, 3 = average of internal and external, 4=zone 1 temperature (from
modbus – do not use with un-‐zoned systems).
In this case the "external" option refers to the return air sensor plugged in to the SAT-‐3.
Note
:
Return air sensing picks up on the air temperature in the return air duct. When the fan is off
this may not be a good indication of the room temperature. For this reason we recommend
using fan on mode with return air sensing.
Fresh air introduced up-‐stream of the return air sensor will affect the temperature reading
making it less representative of the room temperature. Take care with the sensor placement
so that the temperature is not influenced by a fresh air intake – better to be placed prior to
any any fresh air introduction.
