User Instructions for GECO GH21TA controller
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Page 3 Edition I
19.06.2013
1.
Description of controller
The GH21TA controller is assembled using microprocessor techniques utilising automatic
surface mounting.
This controller is a device used to control the process of preparing domestic hot water
(the DHW circuit), and provides support for the main circuit (circuit CH). Parameters can be
adapted according to the condition and the type of boiler.
The controller is equipped with a system to guard against power failure and various types of
interference. The controller identifies each emergency and gives a visual and audio warning.
The controller automatically supports three installation configurations, which meet the
requirements of the installer fully. The device supports three temperature sensor inputs,
digital input for reed relay switch, additional output for room panel GA03HA, and four outputs
for external devices.
The GH21TA controller is equipped with:
• Temperature inputs:
- to measure the temperature of the water coming from the boiler
- to measure the temperature of the feeder tray
- to measure the temperature of the water in the boiler / returning CH temperature
•
Digital input
-
for connecting cotter pin break sensor to boiler piston feeder – reed relay
•
Input (RS485)
- Dedicated connector for GECO GA03HA room panel
2.
Technical specifications
Supply voltage
230V
~
+10% -15%
Resistance
characteristics of NTC
sensor
Operating temperature
od +5°C do +40°C
Humidity
od 20% do 80% RH
Temp.
°C
Resistance
Ω
Fuse – Fan, Feeder
3.15A
0
7174.89
Sensor type
NTC 2.2k
Ω
10
4374.83
Sensor temperature
operating range
NTC: 0°C÷100°C
20
2747.10
30
1774.91
40
1172.09
Input
Maximum continuous
load
50
795.08
60
547.95
CWU pump
1A
250W
70
384.62
CO pump
1A
250W
80
275.86
Fan*
1A
250W
90
202.37
Feeder*
1A
250W
100
149.16
