A.O. Smith Theta T Series, Installation, User And Service Manual

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Installation-, User- and Service Manual
74
3.6 Electrical
connections
Note
The composition of the Theta duel service module has influence on the selection of the
required heating pump. To select the right heating pump, the table below shows the
characteristics, of the heating side, that affect the choice of heating pump.
Theta Dual
Service Module P
(kW)
ΔT
Specifications plate heat exchanger
heating side
flow
(m
3
/h)
ΔP
(kPa)
T(M) 20 6 20 36-30 2,9 8
T(M) 20 10 20 40-30 1,7 9
T(M) 20 20 20 70-50 0,9 2,5
T(M) 30 6 30 36-30 4,3 10
T(M) 30 10 30 40-30 2,6 6,5
T(M) 30 20 30 70-50 1,3 5
T(M) 40 6 40 36-30 5,8 17
T(M) 40 10 40 40-30 3,5 11
T(M) 40 20 40 70-50 1,8 9
Note
Place, in the return pipe of the DHW-system a non-return valve (2.4.2 "Controller" and
3.4 "Installation Diagram"). Place this non-return valve between the DHW-system and
the Theta dual service system.
This non-return valve ensures that there will not flow cold water, beyond the DHW-
system, when hot water is drawn. The non0return valve ensures that the pressure
difference over the 3-way mixing valve is not too large.
Note
The non-return valve is not a part of the Theta dual service module. The installer must
provide this valve.
Warning
The installation should be carried out by a competent person, in compliance with general
and locally applicable regulations (1.3 "Regulations").
This section covers the following topics:
 Preparation;

Connecting the mains power (only BFC);

Connecting the DHW-pump;

Connecting the heating pump;

Connecting the heating sensor;

Connecting the 3-way mixing valve;

Connecting the room thermostat;

Connecting the communication cable (only BFC).