Geco GH20SB User Manual

GH20SB – User Manual PAGE 26
5. Additional Functions
5.1. Collector Freezing Prevention Function
When this function is enabled, the collector pump will activate if the temperature at the T1
sensor is lower than or equal to the freezing point defined in the Heat transfer fluid setting and the
T2 temperature is higher than 7°C. The pump will deactivate if the T2 temperature falls below 5°C
or the (T1 – 2) temperature is higher than the freezing point defined in the Heat transfer fluid
setting.
Additionally, in schemes 15 and 16, where a second collector is used, when this function is
enabled, pump K will activate if the temperature at the T3 sensor is lower than or equal to the
freezing point defined in the Heat transfer fluid setting and the T2 temperature is higher than 7°C.
The pump will deactivate if the T2 temperature falls below 5°C or the (T3 – 2) temperature is
higher than the freezing point defined in the Heat transfer fluid setting.
5.2. Anti-Legionella Function
The anti-legionella function applies only in schemes 3, 4 and 14. It is always activated once
a week, in the night from Sunday to Monday, at 12 midnight. When the anti-legionella function is
activated, the collector pump is deactivated and the boiler and, additionally, the circulation pump,
are turned on. When the temperature measured by the T4 sensor exceeds 70°C, the circulation pump
and the boiler turn off and the anti-legionella function deactivates. Next time it will be activated in a
week, in the night from Sunday to Monday.
The anti-legionella function does not work during holidays.
5.3. Holiday Function
The holiday function consists in totally disabling the control of the heater, the gas boiler, the
heat pump, the boiler pump etc. Additionally, when the holiday function is active, the collector
cooling function (regardless of whether it is enabled) and the collector overheating prevention
function (regardless of the value in the “ZabPrzeg” setting) are also active. When the Controller
finishes the application of the holiday function, the function is automatically deactivated so as not to
activate next year. This function should be set manually before any planned holidays.
5.4. Manual Cooling Function
The manual cooling function is available in the main menu. When the cooling option is
enabled or the holiday function is active and the temperature in the tank measured by the T2 sensor
is higher than the cooling activation temperature, the collector pump activates and remains active
until the temperature in the tank measured by the T2 sensor falls below cooling deactivation
temperature. The pump activation is always linked with the freezing prevention function.
The manual cooling function is time-based and is active between 12 midnight and the
cooling end hour defined in the settings. During the collector cooling, only the main collector pump
P operates, while all other devices are inactive. The only exception here is the dump valve in
scheme 17, i.e. it will be active if the T4 temperature is higher than the T4
max
temperature and it will
be inactive if the T4 temperature is lower than the (T4
max
– 1) temperature.

Geco GH20SB Specifications

General

Brand	Geco
Model	GH20SB
Category	Controller
Language	English