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First, make sure that your ZoneHVACLowTempRadiantConstFlow object has the following parameters:

• availabilitySchedule set to an Always Off schedule.
• temperatureControlType set to MeanRadiantTemperature and that temperature set to something substantially lower than your surface setpoint (in your case 21 C).

Then, write an EMS routine that will do the following:

• Read the Surface Inside Face Temperature for the ceiling in question.
• If the temperature is above 25 C (from your requirements), it will change the availability schedule an Always On schedule.
• If the temperature is below 21 C (from your requirements), it will change the availability schedule an Always Off schedule.

That should let you use the equipment as intended. You probably won't be able to autosize correctly the equipment to work under these conditions, so you should hard-size the parameters. Also, this would most likely only work for cooling.