Thermia Atria Optimum, Installation Manual

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9.8 Sub-menu HGW
The menu applies to the heat pumps with de-superheater and only appears if ON in SERVICE -> INSTALLATION -> SYSTEM -> ADDITION -
> HGW menu is selected.
Menu selection Meaning Factory setting
HGW TEMP.
Shows the HGW sensor after the de-superheater (the supply temperature to water heat-
er) in °C.
-
TEMP DIFF
Desired difference between the HGW sensor and water heater’s start sensor. 20K(range: 15K /
35K)
HOT WATER DIFF.
Shows actual difference between the HGW sensor and water heater’s start sensor. -
HOT WATER TO RAD.
If there is a heat demand, the HGW shunt switches to the heating system when the
weighted value is greater than the total of the START temperature for hot water and this
value. Example: 40°+3K = at a temperature of 43°C in the water heater, the shunt
switches to the heating system.
3K(range: 1K /
10K)
MAX TEMP.
Max temperature of the water in the water heater. The temperature is measured on the
peak sensor in the water heater.
N
Domestic hot water can have this temperature, which can
mean that an external mixer valve may be required.
95°C(range:
60°C / 100°C)
START HGW
The number of seconds the HGW shunt is to open at HGW start is the starting point of
shunt opening. The opening time for the HGW shunt from fully closed to fully open to-
wards the water heater is 30 seconds.
7S(range: 0S /
30S)
INITIALIZING HGW
The time in seconds before control of HGW shunt starts after HGW start. 60S(range: 10S /
90S)
INTEGRAL DELAY
Delay of integral calculation in seconds after the integral value for HGW has been
reached.
10S(range: 5S /
120S)
HGW-SHUNT TIME
The time that the signal is active to open or close the HGW shunt completely. 35S(range: 15S /
60S)
HGW INT. BOUND.
Integral value (parameter) for HGW. 60(range: 10 /
120)
HGW INTEGRAL
Shows the actual value for the HGW integral. Plus indicates that the shunt opens towards
the water heater and minus indicates that the shunt opens towards the heating system.
-
PULSE WIDTH
How long the plus or minus signal to the shunt is to be high when the HGW integral has
been reached.
0.25S(range:
0.20S / 1.00S)
Installation Guide Domestic heat pumps
VMGFP202 Thermia Värmepumpar
58