New Features for 4 Series ESTIA:
A-rated water circulating pump installed in hydro unit
Minimum target water temperature reduced to 7°C in cooling mode for improved compatibility with fan
coil units
Hydro unit pump ON / OFF cycling function – to momentarily operate water pump during long periods of
system OFF
Option to use an external cylinder thermostat, on locally supplied hot water cylinders, for domestic hot
water production
Improved control for second remote controller when used with under floor heating
Improved control for ESTIA / boiler connection
New expansion vessel for hydro unit
New compressor for single phase ESTIA outdoor units
Note:
Under floor heating components, fan coil units, radiators, valves and other installation materials must be
procured locally.
Notes on System Design
• The input water temperature to the hydro unit must be 50°C or less. This is especially important if the
hydro unit is used in conjunction with any other external heating source (auxiliary boiler, electric booster
heaters etc.)
Unit failure or water leaks may result if the return water temperature, to the hydro unit, exceeds 50°C
• The minimum flow rate for the circulating water in the heating/cooling circuit must meet the following
range:-
11, 14 and 16 kW: 17.5 L/minute or more
8 kW: 13 L/minute or more
If the flow rate becomes less than the flow rate specified above, the flow switch in the hydro unit is activated
to stop operation.
When thermostatic devices are used for temperature control a bypass valve must be fitted to the heating
circuit, to ensure the minimum water flow rate is maintained in the event of all thermostatic devices closing
at the same time
• Only use the water pump, built into the hydro unit, to circulate the water in the heating circuit
• The hydro unit back up heaters will operate to assist the heat pump capacity output during low ambient
conditions
• The hydro unit has been designed for indoor installations. Do not install outside where there is a risk of
low ambient conditions. This may cause the water in the pipe work to freeze
• Make the water circuit closed. Never use it as an open circuit.
• To prevent damage to the system the volume of the circulating water must be 20 litres or more. If total
volume of water amount is less than 20 litres, then the unit may not function fully due to the operation of
protective controls.
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