PI Control series is a 24 VAC Floating / Modulating Digital Thermostat that provides Proportional + Integral (P+I) control for optimum temperature control and comfort in HVAC system. It is used with the single fan speed. Other available features include selection of Modulating output, Minimum / Maximum setting temperature, Digital input for energy savings, Monitor of voltage output, Mode of display. The remote temperature sensor can also be provided as the optional.
Table 1 Description of Thermostat
| Model | Mounting | Operation Voltage | Type of Control | Power on/off Switch |
|
PI – 01
|
Vertical
|
24 VAC
|
Floating
|
No
|
|
PI – 02
|
Vertical
|
24 VAC
|
Floating
|
Yes
|
|
PI – 03
|
Vertical
|
24 VAC
|
Modulating
|
No
|
|
PI – 04
|
Vertical
|
24 VAC
|
Modulating
|
Yes
|
Features
- Stylish design with digital display.
- Minimum temperature setting from 5 – 23 ºC (Default 11 ºC).
- Maximum temperature setting from 16 – 34 ºC (Default 30 ºC).
- Selection of Modulating output for 0 – 10 or 2 – 10 Vdc either for Direct or Reverse acting actuator.
- Temperature offset –2 to +2 ºC (Default 0 ºC).
- Digital input for energy savings.
- Mode of display : Room temperature, Setting temperature or Output voltage.
- Temporary view of output voltage for Modulating type control.
- EEPROM permanently retains user setting in case of power loss.
- Remote sensor (optional) with auto detect of temperature sensor (internal or remote sensor).
Table 2 Thermostat
| Power Supply | 24 Vac nominal, 18-30 Vac, 50/60 Hz. |
| Electrical rating | 1.5 Amp maximum |
| Temperature setting range | 5 – 34 °C |
| Operating relative humidity | 5 to 9 % RH, non condensing |
| Output | 0 – 10 Vdc or 2 2 – 10 Vdc (programmable)/Floationg (24 Vac) |
| Mounting | Directly onth wall or 2″x4″ Vertical junction box |
DIMENSION
OPERATION
Power on/off (for Model 02 & 04 only)
Use ON/OFF switch to turn on / off the system.
Temperature setting
Use 
or 
to change the temperature setting.
Minimum temperature set point
The system provides the facility to program the minimum setting point in a range of 5 – 24 ºC.
Maximum temperature set point
The system provides the facility to program the maximum setting point in a range of 16 – 35 ºC.
Actuator type & control
The system provides the facility to program the type of the actuator whether to be Direct or Reverse acting. It can also be programmed to provide the output voltage of 0 – 10 or 2 –10 Vdc.
Temperature offset
The temperature offset can be set in a range of – 2 to + 2 ºC.
Display mode
The Display can be programmed to display room temperature, setting temperature or Voltage reading (for Modulating type control).
Temporary view of Output voltage (Modulating control only)
The user can temporary view of Output voltage.
Remote sensor (optional)
The Remote sensor can be provided as the optional. It can be the temperature module, epoxy or pipe type. The system will automatically detect whether the internal or the Remote sensor is used.