PI series is a 24 VAC/VDC 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 Minimum / Maximum setting temperature, Digital input for energy savings, Mode of display. The remote temperature sensor can also be provided as the optional.
Model | Mounting | Operating voltage | Type of control | Power on/off switch |
PI – 03 | Vertical | 24 VAC | Modulating 0-10V or 2-10V | No |
PI – 04 | Vertical | 24 VAC | Modulating 0-10V or 2-10V | Yes |
Power supply | 24 Vac nominal, 18 – 30 Vac, 50/60 Hz. or 24 Vdc nominal, 18-30 Vdc |
Electrical rating | 0.8 Amp maximum |
Temperature setting range | 5 – 34 ºC |
Operating relative humidity | 5 to 90 % RH, non condensing |
Output | Modulating 0-10V or 2-10 V Direct/Reversing Actuating |
Mounting | Directly onto wall or 2”x 4 “ vertical junction box |
Read these instructions thoroughly before installing product. Failure to follow these instructions could damage the product or cause a hazardous condition. Check the voltage and current ratings on the product to ensure that it is suitable for your application. Installer must be a trained, experienced service technician. Check product for proper operation after installation
NOTE: Level thermostat mounting is for appearance only and is not required for proper thermostat operation.
Mounting Thermostat
Take out the back plate by removing the locking screw (if any) at the bottom of the thermostat. Use a flathead screwdriver to unlock the snaps. Lift and pull it up to remove back plate.
The 18-22 gauge wire is recommended for wiring.
Using back plate as a guide, mark two mounting holes on the wall. Drill two mounting holes. Place anchors (provided) into the holes until flush with the hole. Position back plate on the wall and thread the wires from the heating and cooling equipment through the wiring hole. Holding the back plate in place on the wall, secure it to the wall using mounting screws (provided).
The following instructions provide information to test the cooling equipment and to change operating parameters from the factory settings.
Enter Installer Setup
Program 1 : Minimum temperature setting
To set the minimum temperature (5-23 ºC) allowed for the user.
Second digit displays | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
Min. temp. setting | 5 | 7 | 9 | 11 | 13 | 15 | 17 | 19 | 21 | 23 |
Program 2 : Maximum temperature setting
To set the maximum temperature (16-34 ºC) allowed for the user
Second digit displays | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
Max. temp. setting | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 |
Program 3: Type of valve/damper
There are several types of valve/damper subject to the types actuating, feed back and direction. Program the thermostat to match with the type of valve/damper used.
Second digit displays | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
Type of actuating | 0-10V | 2-10V | 0-10V | 2-10V | 0-10V | 2-10V | 0-10V | 2-10V | 0-10V | 2-10V |
Type of feed back | 0-10V | 0-10V | 2-10V | 2-10V | 0-10V | 0-10V | 2-10V | 2-10V | None | None |
Feed back direction | DA | DA | DA | DA | RA | RA | RA | RA | None | None |
Program 4: Setting of Calculating position cycle
This program is used to select interval time of position calculation for valve control. It can be set in a range of 30-120 seconds. The control will delay the next operation of the valve/damper until the current operation is completed.
Second digit displays | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
Opening time (sec.) | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 |
Program 5: Kp setting
Kp is the proportional factor that control the opening of the valve/damper. The higher Kp, the faster the room temp. is brought to the set temp. However the fluctuation of the room temp. is also higher. Then Kp shall be set properly.
Second digit displays | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
Kp | 1 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 |
Note : Default setting is 5 (Kp = 10).
Program 6 : Ti setting
Ti is the integral factor that control the opening of the valve/damper. The higher Ti, the slower the room temp. is brought to the set temp. However the fluctuation of the room temp. is less. Then Ti shall be set properly.
Second digit displays | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
Ti | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 120 | 160 | 200 |
Program 7 : Temperature offset
Second digit displays | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
Offset temp. (ºC) | -2 | -1.5 | -1 | -0.5 | 0 | 0.5 | 1 | 1.5 | 2 |
Program 8 : Display mode
The user can set the Display to show
Second digit displays | 0 | 1 | 2 | 3 |
Display | Room temp. | Set temp. | % valve/damper (controller’s command) | % valve/damper (actual) |
Program 9: Temperature display in decimal number
The user can set the temperature display to show
Second digit displays | 0 | 1 |
Display | Integer number | Decimal number |
Download manual:
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