ActronAir Relative Humidity Sensors
Installation and Commissioning Guide
Introduction
This guide provides instructions for the installation and commissioning of ActronAir Relative Humidity Sensors, specifically the CRH-D and CRH-S models.
The sensors are designed for use with ActronAir's Hercules, Tri-Capacity, VCC, and Genesis air conditioning systems, particularly when optional Reheat or Economy (Enthalpy) cycles are utilized.
Sensor Models
Model: CRH-D
Model: CRH-S
Applicable Models
System Type | Applicable Model Numbers |
---|---|
HERCULES | PKV1700T to PKV2000T |
TRI-CAPACITY | PKY470T to PKY960T |
VARIABLE CAPACITY COMMERCIAL (VCC) | PKV720T to PKV960T |
GENESIS | PRV72AT to PRV96AT |
Congratulations on your purchase of an ActronAir Humidity Sensor. This device has been designed and manufactured with the highest quality standard in mind. We hope that you will be satisfied with your excellent choice.
Please read this guide thoroughly and keep it near the unit for future reference.
01. Safety Precautions
- Read all instructions in this guide before operating the air conditioning unit. Failure to do so may result in damage to the unit and void your warranty.
- Turn-Off power from mains supply by removing fuse or switching the circuit breaker to the Off position before installation or servicing this control interface.
- Follow sound LOCK-OUT/TAG OUT (LOTO) procedures to ensure that power supply is not re-energised accidentally.
- The sensors described in this guide require a power supply of 24 VAC.
- Installation and servicing must be carried out only by a qualified technician.
- Ensure that the unit installation complies with relevant council regulations and building code standards. All electrical wiring must be in accordance with current electrical authority regulations and all wiring connections must be as per the electrical diagram provided.
- WH&S rules and regulations must be observed and will take precedence during the installation process.
- Only use these sensors with an ActronAir air conditioner as described in this installation guide.
02. General Features
The CRH-D and CRH-S humidity sensors are utilized in ActronAir Hercules, Tri-Capacity, VCC, and Genesis air conditioning systems when the optional Reheat or Economy (Enthalpy) cycle is needed.
The CRH-D model is designed for duct mounting to measure and monitor relative humidity in the supply air through the ductwork during the Re-heat cycle. It is installed on the return side when operating in Economy Cycle. Conversely, the CRH-S model is mounted on the wall and measures the indoor humidity relative to the outside air.
Both sensors are equipped with 8 DIP switches for mode selection and setting the sensor's address.
DIP Switch Settings
- DIP 1-5: Address On (128-159). Selection is made in 5-bit binary code.
- DIP 6-7: Mode Selection. Common settings include:
- Off-Off = Supervisory CM100
- Off-On = Modbus 1,8 N,2
- On-Off = Auto (Supv C - Modbus)
- On-On = Modbus 1,8 E,2
- DIP 8: Serial Speed.
- Off = 19200 Bit/sec
- On = 9600 Bit/sec
Example Address Selection:
DIP Switch Numbers | Address |
---|---|
1=On, 2-5=Off | 129 |
1-5=Off | 128 |
Protocols: CM100 / Modbus supervisor protocol (or Auto).
Serial Speed: 9600 ... 19200 bit/sec. The default baud rate used with ActronAir systems is 19200 Bit/sec.
Humidity Sensors Operating Range
Model | Part Number | Range |
---|---|---|
CRH-D | 2060-201 | -10°C to 70°C, 10%rh to 90%rh |
CRH-S | 2060-202 | -10°C to 70°C, 10%rh to 90%rh |
03. Dimensions
CRH-D Dimensions (in mm)
CRH-S Dimensions (in mm)
05. Mounting and Drilling Holes Template
CRH-D Mounting Template
CRH-S Mounting Template
06. Connections
Notes:
- Use a 4 Core (2 Pair) Twisted Pair 0.5 mm² (16/0.20) Shielded Data Cable. Connect the shield to the GND terminal and to an earth if G0-Earth connection is required.
- Do not run serial cables near the 230V or 415V power supply cables or contactor control cables to reduce electromagnetic coupling.
- The maximum connection distance is 100 m between the sensors, 200 m in total for two humidity sensors connection.
07. Humidity Sensors Address and DIP Switch Settings
This section details how to configure the sensors using DIP switches for addressing and mode selection.
Address | Relative Humidity (RH) Sensor | DIP Switch Settings (HERCULES/VCC) | DIP Switch Settings (TRI-CAPACITY) | ||
---|---|---|---|---|---|
Sensor 1 | Outside Air RH Sensor | DIP switch 6 and 7 ON | DIP switch 7 ON | ||
Room Air RH Sensor | DIP switch 1, 6 and 7 ON | DIP switch 1 and 7 ON |
NOTE: "Room" RH Sensor is also referred to as "Inside" or "Return" RH Sensor.
08. Electrical Connection Using 1 Sensor
08.01. HERCULES (PKV)
Notes for Return Air Temperature Sensor: A 6m Return Air Temperature sensor is supplied with the unit and requires connection by the installer, referring to the Hercules Installation and Commissioning Guide (0525-021). The RH sensor has a built-in temperature sensor that can be used instead.
Note for Humidity Sensor Wires: Must be 4 Core (2 pair) twisted pair 0.5mm² (16/0.20) shielded data cable.
Important: Make sure the 120 Ω resistor is connected as shown for reliable 485 bus operation.
Notes:
- For Room Air Relative Humidity sensor, set DIP switch 1, 6 and 7 to ON.
- For Outside Air Relative Humidity sensor, set DIP switch 6 and 7 to ON.
08.02. TRI-CAPACITY (PKY820-960T)
Notes for Return Air Temperature Sensor: A 6m Return Air Temperature sensor is supplied with the unit and requires connection by the installer, referring to the Tri-Capacity PKY820-960 Installation and Commissioning Guide (0525-070). The RH sensor has a built-in temperature sensor that can be used instead.
Note for Humidity Sensor Wires: Must be 4 Core (2 pair) twisted pair 0.5mm² (16/0.20) shielded data cable.
Important: Make sure the 120 Ω resistor is connected as shown for reliable 485 bus operation.
Notes:
- For Room Air Relative Humidity sensor, set DIP switch 1 and 7 to ON.
- For Outside Air Relative Humidity sensor, set DIP switch 7 to ON.
08.03. TRI-CAPACITY (PKY470-700T)
Notes for Return Air Temperature Sensor: A 6m Return Air Temperature sensor is supplied with the unit and requires connection by the installer, referring to the Tri-Capacity PKY470-700 Installation and Commissioning Guide (0525-069). The RH sensor has a built-in temperature sensor that can be used instead.
Note for Humidity Sensor Wires: Must be 4 Core (2 pair) twisted pair 0.5mm² (16/0.20) shielded data cable.
Important: Make sure the 120 Ω resistor is connected as shown for reliable 485 bus operation.
Notes:
- For Room Air Relative Humidity sensor, set DIP switch 1 and 7 to ON.
- For Outside Air Relative Humidity sensor, set DIP switch 7 to ON.
08.04. VCC (PKV) and GENESIS (PRV)
Notes for Return Air Temperature Sensor: A 6m Return Air Temperature sensor is supplied with the unit. Requires connection by the installer, referring to the VCC PKV720-960T Installation and Commissioning Guide (0525-122) or Genesis PRV72AT-96AT Installation and Commissioning Guide (0525-139). The RH sensor has a built-in temperature sensor that can be used instead.
Note for Humidity Sensor Wires: Must be 4 Core (2 pair) twisted pair 0.5mm² (16/0.20) shielded data cable.
Important: Make sure the 120 Ω resistor is connected as shown for reliable 485 bus operation.
Notes:
- For Room Air Relative Humidity sensor, set DIP switch 1, 6 and 7 to ON.
- For Outside Air Relative Humidity sensor, set DIP switch 6 and 7 to ON.
09. Electrical Connection Using 2 Sensors
09.01. HERCULES (PKV)
Notes for Return Air Temperature Sensor: A 6m Return Air Temperature sensor is supplied with the unit and requires connection by the installer, referring to the Hercules Installation and Commissioning Guide (0525-021). The RH sensor has a built-in temperature sensor that can be used instead.
Note for Humidity Sensor Wires: Must be 4 Core (2 pair) twisted pair 0.5mm² (16/0.20) shielded data cable.
Important: Make sure the 120 Ω resistor is connected as shown for reliable 485 bus operation.
Notes:
- For Room Air Relative Humidity sensor, set DIP switch 1, 6 and 7 to ON.
- For Outside Air Relative Humidity sensor, set DIP switch 6 and 7 to ON.
09.02. TRI-CAPACITY (PKY820-960)
Notes for Return Air Temperature Sensor: A 6m Return Air Temperature sensor is supplied with the unit and requires connection by the installer, referring to the Tri-Capacity PKY820-960 Installation and Commissioning (0525-070). The RH sensor has a built-in temperature sensor that can be used instead.
Note for Humidity Sensor Wires: Must be 4 Core (2 pair) twisted pair 0.5mm² (16/0.20) shielded data cable.
Important: Make sure the 120 Ω resistor is connected as shown for reliable 485 bus operation.
Notes:
- For Room Air Relative Humidity sensor, set DIP switch 1 and 7 to ON.
- For Outside Air Relative Humidity sensor, set DIP switch 7 to ON.
09.03. TRI-CAPACITY (PKY470-700T)
Notes for Return Air Temperature Sensor: A 6m Return Air Temperature sensor is supplied with the unit and requires connection by the installer, referring to the Tri-Capacity PKY470-700 Installation and Commissioning Guide (0525-069). The RH sensor has a built-in temperature sensor that can be used instead.
Note for Humidity Sensor Wires: Must be 4 Core (2 pair) twisted pair 0.5mm² (16/0.20) shielded data cable.
Important: Make sure the 120 Ω resistor is connected as shown for reliable 485 bus operation.
Notes:
- For Room Air Relative Humidity sensor, set DIP switch 1 and 7 to ON.
- For Outside Air Relative Humidity sensor, set DIP switch 7 to ON.
09.04. VCC (PKV) and GENESIS (PRV)
Notes for Return Air Temperature Sensor: A 6m Return Air Temperature sensor is supplied with the unit. Requires connection by the installer, referring to the VCC PKV720-960T Installation and Commissioning Guide (0525-122) or Genesis PRV72AT-96AT Installation and Commissioning Guide (0525-139). The RH sensor has a built-in temperature sensor that can be used instead.
Note for Humidity Sensor Wires: Must be 4 Core (2 pair) twisted pair 0.5mm² (16/0.20) shielded data cable.
Notes:
- For Room Air Relative Humidity sensor, set DIP switch 1, 6 and 7 to ON.
- For Outside Air Relative Humidity sensor, set DIP switch 6 and 7 to ON.
10. Configuration Procedure
Notes:
- The sensor (model: CRH-S) is used to measure the Outside or Room Relative Humidity.
- The sensor (model: CRH-D) is used to measure the Supply Air Relative Humidity.
10.01. Outside Air Relative Humidity Sensor Configuration
1. Activate the sensor for Outside Air Relative Humidity via Service menu screen:
Menu Progression: Main Menu ➔ G. Service ➔ Gf. Service settings ➔ Gfc. Thermoregulation
Hercules
Tri-Capacity
Notes:
- Thermoregulation is under Service settings sub-menu level, which is password protected.
- Enter the Service Password (7378) using the ⇧ (Up), ⇓ (Down) and ⇔ (Enter) keys in order to gain access to Service menu.
- Use the ⇧ (Up), ⇓ (Down) and ⇔ (Enter) keys to change the prompts from No to Yes.
- Make sure the DIP switches 6 and 7 on the Sensor 1 are set to ON.
2. Check the current reading of the Outside Air Relative Humidity sensor via "Status AIN" screen.
Menu Progression: Main Menu ➔ E. Status
Hercules Status
Tri-Capacity Status
Action: Check the Outside Humidity Sensor readings.
NOTES: If the values are 0, CM100 is not communicating with the Outside Humidity Sensor. Check your wiring connections, DIP switch settings on the sensor and configuration procedure.
10.02. Room Air Relative Humidity Sensor Configuration
1. Activate the sensor for Room Air Relative Humidity via Service menu screen:
Menu Progression: Main Menu ➔ G. Service ➔ Gf. Service settings ➔ Gfc. Thermoregulation
Hercules
Tri-Capacity
Notes:
- Thermoregulation is under Service settings sub-menu level, which is password protected.
- Enter the Service Password (7378) using the ⇧ (Up), 凸 (Down) and ⇔ (Enter) keys in order to gain access to Service menu.
- Use the ⇧ (Up), 凸 (Down) and ⇔ (Enter) keys to change the prompts from No to Yes.
- Make sure the DIP switches 6 and 7 on the Sensor 1 are set to On.
2. Check the current reading of the Room Air Relative Humidity sensor via "Status AIN" screen.
Menu Progression: Main Menu ➔ E. Status
Hercules Status
Tri-Capacity Status
Action: Check the Room Humidity Sensor readings.
NOTES: If the values are 0, CM100 is not communicating with the Room Humidity Sensor. Check your wiring connections, DIP switch settings on the sensor and configuration procedure.
10.03. Procedure when the Sensor is used as Room Air RH Sensor - Reheat Operation (Hercules models only)
- Activate the sensor by following steps 2.1 and 2.2 from procedure when sensor is used as Room RH.
- Set the "Room Humidity" parameters via G. Service menu and then "f. Service settings" (Gf Screen).
- Go to "c. Thermoregulation" (Gfc Screen) sub-menu and then to "Thermoregulat. Gfc2", to set the Return Humidity parameters.
NOTE: "Return Humidity" means "Room Humidity".
10.04. Room Air Relative Humidity Setpoint Adjustment (Hercules models only)
Consumer / End User will use screen B1 to adjust Relative Humidity setpoint to suit their desired condition.
10.05. Economy Cycle Settings
1. Set-up the Relative Humidity sensor “Economy Cycle" settings via Service menu, as applicable:
NOTE: For the following settings; outside humidity sensor should be set to Yes.
Settings:
- Humidity: Min = 0.0%, Max = 99.9%, Default = 60.0%
- Enthalpy: Min = 0.0kJ/kg, Max = 99.9kJ/kg, Default = 45.0kJ/kg
- Dew Point: Min = 0.0°C, Max = 99.9°C, Default = 13.0°C
- Moisture: Min = 0.0g/kg, Max = 99.9g/kg, Default = 8.0g/kg
Menu Progression: Main Menu ➔ G. Service ➔ Gf. Service settings ➔ Gfd. Economy settings
NOTE: For the following settings; room and outside humidity sensor should be set to Yes.
Settings:
- Enthalpy Difference: Min = 0.0kJ/kg, Max = 50.0kJ/kg, Default = 10.0kJ/kg
Menu Progression: Main Menu ➔ G. Service ➔ Gf. Service settings ➔ Gfd. Economy settings
10.06. VCC Economy Cycle
Humidity Sensor may be activated by setting the Outdoor Board. See Installation and Commissioning Guide for details.
- Option 1: Single sensor. Enable the Outside damper. Set - ECoE - oAdC
- Option 2: Two sensors. Enable the Outside damper and Economiser control. Set - ECoE - oAdC and ECEo
- Option 3: Three sensors. Enable the Outside damper, Economiser control and Humidity sensor source. Set - ECoE - oAdC, ECEo and EHCS
The table below is from the Variable Commercial Capacity Installation and Commissioning Guide (Configuring and Commissioning Setup section) when navigating through the Outdoor board menu.
diS (Display) | SEr (Service) | Display system's status and settings |
---|---|---|
ECoE | Service use only | |
oAdC = Outside air damper enable | ||
oAdo = Outside air damper On Off | ||
ECEo = Economiser control enable | ||
EHCE = Humidity control enable | ||
EHCo = Humidity control mode | ||
EHCS = Humidity sensor source | ||
CCE = CO2 control enable |