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

Page: 87 / 109

Installation-, User- and Service Manual
87
7 Shutting down
7.1 Introduction
7.2 Decommissioning
for a short period
7.2.1
This chapter covers the following topics:

Decommissioning, the system, for a short period;

Decommissioning, the system, for a long period.
The system consists out of two parts:
1. DHW-system;
2. Theta dual service system.
DHW-system
To decommission the DHW-system for a short period, you must activate the frost
protection of the water heater. The frost protection will prevent water from freezing in the
water heater.
Note
By activating the frost protection you will water from freezing in the DHW-system and
dual service system and NOT the heating system. To prevent water freezing in the
heating system is responsibility of the installation engineer of the heating system.
Important
When switching on the frost protection, on the water heater, the water heater can still
respond to any heat demand from the heating system. When the heating system
generates heat demand the heating cycle of the water heater will start. The display of the
controller is shown as in the figure.
Activate the frost protection as follows:
1. Press button to select the main menu.
2. Using

and

, place the cursor beside OFF.
Confirm with ENTER.
The frost protection cuts in when the water temperature drops below 5°C. The text
FROST will then appear on line one of the display. The water heater will heat the water
to 20°C (T
set
) before dropping back to mode OFF.
Note
These values of 5°C and 20°C cannot be adjusted.