This page will help assist on Heating and Cooling
System:
| Door Entry: | Standard | ORC-7TF-WH | installed flush |
| Heating: | Standard 2-10 | ORC-HAGW-EXT-B, ORC-HC2-24F-RS485 | Fan and actuator, 2-10V DC PWM |
| Cooling: | Standard 2-10 | ORC-HAGW-EXT-B, ORC-HC2-24F-RS485 | Fan and actuator, 2-10V DC PWM |
| Alarms: | Water / Smoke / Doorbell | ORC-ALARM-16 + ORC-LEAK-WD | Doorbell, Smoke and Water leaks in some rooms |
| Lighting: | Home / Away (default) | ORC-HAGW + CONTACTOR | Lighting ON/OFF to all lights only |
Other information:
Heating and cooling control is provided by Orcomm controls installed with in the utility area. The controls give a signal 2-10V DC via PWM outputs to Actuators installed on the Cooling and Hot water pipes. The Fan is also controlled by the PWM 2-10V outputs.
The system was installed and pre-commissioned with values as per spec.
During installation it was recognised that the actuators require a minimum of 2.1V DC to work correctly. Without this value the Actuator may reset or re calibrate. If the system is not giving this minimum value, check cable connections by removing from the ORC-HAGW-EXT-B inside the enclosure and test output with no cables connected.
If value is higher than 2.1V then check cables / connections.
If value is lower than 2.1V, then adjust voltages via the Touch screen hidden menu.
MORE > HIDDEN MENU > ZONES > Enter "DEVICES" with desired room > Choose thermostat > Enter SETTINGS" COG symbol > amend voltages > SAVE > EXIT
Once done reboot screen and try adjusting temperature.
During commissioning the site recognised that the valves may revert to fully open when incorrect voltage.
To check this, turn OFF the orcomm system via the Electrical enclosure (ORCOMM breaker)
Wait 2 minutes and check no water flow on LTHW and CHILLED meter. If the water is still flowing then an actuator is not calibrated.
NOTE: the actuators are powered locally by the FCU - orcomm only sends 2-10V signal to operate up / down.
Q: Can the orcomm give a constant output on 2-10V
A: Yes - if the PWM output has received a return voltage (ie 24V AC) then the safety diode will fall open, to allow pipes to work.
Q: the system randomly operates for few minutes
A: Yes this is known as Flush or Valve exercise, and was decided to be set during the day time. It will operate for approx 3 minutes. This is best practice by mechanical designs to ensure valves do not seize and pipes are flushed
Q: When I select a higher temperature the system is not working.
A: there are a few test to check before calling your site support team.
1: If this room has an FCU heating system, then check you have a fan speed (this will show a FAN icon, LOW, Medium,
HIGH or AUTO) on the room thermostat.
If no fan is selected then the FCU will not operate.
2: If this is a bathroom, then this has EUFH (Electric under floor heating) - The "HAND ICON" must be ON for the system to
communicate. By pressing M on the room stat it will toggle between OFF and "HAND ICON"
If the "HEAT ICON" is ON constantly and NO heat after an hour then this is an Electrical issue.
If the "HEAT ICON" is flashing then the safety cutoff has activated. The system will not heat the EUFH until the heat drops below set point
If the "HEAT ICON" is not ON, then select up to see what current Set temperature is, this must be 1 degree higher than ambient to activate