Filling; Theta Dual Service System; Heating System - A.O. Smith Theta T Series Installation, User And Service Manual

4 Filling

4.1 Theta Dual service
system
4.2

Heating system

Installation-, User- and Service Manual
Warning
The installation should be carried out by a competent person, in compliance with general
and locally applicable regulations (1.3 "Regulations").
This chapter describes the filling activities to be carried out before final commissioning
the installation.
Fill the DHW-system first. Consult the Installation-, User- and Service Manual of the
water heater for filling the DHW-system.
Warning
During filling the water heater and controller of the Theta dual service module should be
isolated from the mains power supply, this to avoid the activation of the DHW- and
heating pump when there is no water in the system.
In order to fill the Theta dual service side of the system proceed as follows:
1. If present, open the stop valve (4) in the DHW-system for the circulation pump (6).
2. Pull the knob, on the top of 3-way mixing valve motor, and turn it about 45° to the left
(counter clockwise) until it stops.
3. Bleed the Theta dual service system. If present, open the (manual) stop valve near
the 3-way mixing valve.
4. The system is now under water pressure.
5. After bleeding, turn the knob 45° (clockwise) to the right to its original position and
push the knob in.
In order to fill the heating side of the system use the fill and drain valve (57) in the
heating system.
Warning
During filling the water heater and the controller of the Theta dual service module needs
to be isolated from the main power supply, in order to prevent that the DHW-pump and
the heating pump will be activated.
Note
The heating system should be filled with drinking water according to the European
Drinkwater Directive 98/83/EC. If it is desired to add additives to the heating system, the
heating water must meet the liquid classes 1, 2 or 3 described in the EN 1717.
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