Ecotec EAS SERIES Installation & User Manual - page 5
© Ecotec Heat Pumps Ltd | Installation Manual & User Guide 5
EAS HEAT PUMP
CIRCULATING PUMP
EXPANSION TANK
BY-PASS VALVE
AUTOMATIC AIR
VENT
THERMAL STORE
Radiator heating systems
Radiator sizing: Always look to use high efficiency
radiators. Convection radiators are a good option.
Radiators should be sized to heat the room with an
entering water temperature of 50°-60°c. This
should be checked with the radiator manufacturer
as different radiators will require varying output
factors.
System design: EAS heat pumps are designed to be
part of a fully pumped pressurised system; fitted
with a variable speed pump and require a suitably
sized diaphragm expansion vessel automatic air
bleed, pressure gauge and a filling loop
incorporating a stop valve, double check valve with
test point and removable flexible hose. A safety
(pressure relief) valve should also be fitted, set to
lift at a maximum pressure of 3 bar. The heat pump
should always be used with a reverse return
heating circuit to ensure equalization of pressure
losses to all parts of the system.
Thermostatic radiator valves: TRV’s should be fitted
in accordance with building regulations. To ensure
adequate water flow to the heat pump the radiators
in the room with the thermostat should be left open
without TRV’s. In addition a bypass should be fitted
in the system to prevent loss of flow which could
result in the heat pump cycling on and off more
regularly than it should due to the reduced
temperature drop caused by too little heat transfer.
Pipe work: In order for the heat pump to work
efficiently it is important to size the system pipe to
minimise the pressure drop and ensure adequate
flow at all times. Severe pressure drops and low flow
will result in reduced performance and possible
tripping of the heat pump protective circuit.
Filling a radiator system: The radiator system should
have its own expansion tank. Open the tap between
the cold water system and the heating system in
short intervals and then close it and note the
pressure gauge reading. When the system is full or
the right pressure has been reached, vent the system
and top it up if necessary