OK folks many thanks for the suggestions so far.
I have investigated temperatures on the unit and canvassed opinion from Nurses. Digistats in the individual rooms indicate 28-30C (doesnt feel it though)but a central computerised control panel indicates the rooms are 26.0 - 26.3C. Our HVAC Tech in Estates assures the latter is the accurate readings. either way its not too cold. Nurses state it is a problem throughout but especially in 2 draughty bed spaces.
A quick look at all ventilatory devices in use shows circuits are visibly wet with lots of rainout, however this is "the norm" to me and because i have never seen a circuit in use without heavy condensate in it i have to ask is it (a rain out free circuit)actually achievable?
Mark, it was Owen who suggested the Manual HC mode to me. Obviously as a no cost option i would like to trial this but have concerns over the need for increased staff training and interaction with the MR850. For example if they are put into Manual mode will they retain this as default on power up? Also, service manual states that the user may have to alter the (0.0) setting to suit the conditions whilst in use, as i understand via a diagnostic hidden menu. Obviously this is asking for trouble but i would welcome your experiences before i speak to F&P about it.
Again many thanks to all.
Rojo, i will also keep in mind the suggestion of dual HW circuit - thanks.
Topper