1.5. Inputs HI, ME, LO, CAP and HT
These inputs are electrically isolated from all other circuits. The inputs can accept 24V AC or 12V DC
signals. A thermostat or other controller can be connected as follows:
CP Compressor on/off
HT Cooling / heating
HI – ME – LO Indoor fan speed high / medium / low / off
C1 Common for inputs HI, ME and LO
C2 Common for inputs CP and HT
1.6. Remote On/Off input
A remote on/off signal can be connected to the “On” and “0V” terminals (input for a voltage-free
switch or relay contact). To turn the unit on the remote on/off input must be closed-circuit. When the
unit is off by the remote on/off signal the display will show a slowly flashing – symbol. The remote
on/off input cannot override the compressor minimum run-time of 90 seconds.
If no remote On/Off function is needed then the terminals must be connected (shorted).
When the remote on/off input is used in combination with a SAT-3 or TZT-100 thermostat then refer
to chapter 0: Thermostat auto–on/off options.
1.7. Variable speed indoor fan control input VF (0-10V)
Analogue input VF (0-10V) provides an optional input for control of the indoor fan speed.
Notes:
• 0-10V input VF is referenced to unit earth, it is not electrically isolated.
• Terminal 0V is the reference (return) connection.
For more information about the indoor fan refer to chapter 8.
1.8. Variable capacity control input VC (0-10V)
New OSA models are equipped with a variable speed compressor (inverter) and thus can provide
variable capacity (duty). If the unit is controlled using the 24V AC / 12V DC inputs then capacity can be
controlled by applying a 0-10V analogue signal to input VC.
Notes:
• 0-10V input VC is referenced to unit earth, it is not electrically isolated.
• Terminal “0V” is the reference (return) connection.
• The compressor does not switch off when the voltage on input VC is at 0V. Switching the
compressor on and off is under the control of input CP.
1.9. Reverse cycle valve output R/V
Terminals R/V control the reverse cycle valve. The refrigeration circuit is designed with reverse cycle
valve OFF for cooling mode, ON for heating mode.
1.10. Solid state relay output SSR#1
Output SSR#1 is for control of a compressor crank case heater.
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