Shoebox Heat Pump Manual Version 9.4
Page 25 of 40
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Enable Signal connection is supplied with a temporary link across it . This should be
removed after commissioning and connection to the heating control system.
(Terminals DI1 and L)
Heat Pump Enable Signal
No Call 0
-
50V
Call >120V
50V < Call voltages < 120V are not
permitted
4.7.3.3 Main PCB terminals description
Terminal Block 1
Terminal
Block 2
Terminal
Block 3
Terminal Block 4
Terminal
Block 5
Terminal Block
1
—Space heating/Cooling
Earth
—Earth connection for space heating timeclocks/ control devices connected and powered by the
Heat Pump such as underfloor control units, heating timeclocks and thermostats.
Neutral
—Neutral connection for space heating timeclocks/ control devices connected and powered by
the Heat Pump such as underfloor control units, heating timeclocks and thermostats.
Live
-
240V AC, 1A Live connection for space heating timeclocks/ control devices connected and powered
by the Heat Pump such as underfloor control units, heating timeclocks and thermostats. If the load from
the underfloor control is likely to be near or exceed 2.5A, live should be taken from the output side of the
6A MCB instead.
DI1
—Live return 240V AC, 1A (On signal) call for heating returned from space heating timeclocks/ control
devices connected to the Heat Pump.
DI4
–
2nd Heating Signal—Live return 240V AC, 1A (On signal) call for a second heating set point returned
from space heating timeclocks/ control devices connected to the Evo. This allows a heating zone to be
controlled which requires a higher temperature than other zones. For example a zone of underfloor which
requires a lower flow temperature can be controlled by a timeclock connected to DI1 and DI4 can be used
to control a zone of radiators requiring a higher flow temperature by a second timeclock. If both call
signals occur simultaneously the higher temperature will have priority. In this type of system architecture
the underfloor manifolds must be fitted with thermostatic mixing valves.
DI3
—Cooling call signal 240V AC, 1A. This is the enable signal to the heat to provide cooling. The heat
pump and heating distribution system needs to be configured / specified for cooling applications.
Simultaneous calls for heating and cooling will result in the unit returning an error code. Cooling
applications can also affect eligibility for grant schemes.
DO8 and DO9 must use an external power supply and relay.
*
if the load from the underfloor control is likely to be
near or exceed 2.5A, live should be taken from the out-
put side of the 6A MCB instead
*
Figure 22 Main PCB terminals
