IVT Optima 1000 Assembly, Commissioning And Maintenance Manual page 61

3. Set the running time on the mixing valve motor if using a mixing valve
on the electric/oil-fired boiler. The running time is the time it takes the
mixing valve to move from the fully closed position to the fully open
position. The running time is usually punched on the mixing valve
motor.
Menu displays you might need to adjust or check
1. Set the hysteresis for heat pump on/off switching on the return
sensor T1 (GT1). A lower value gives a shorter interval between start
and stop. Less than 5ºC should be avoided.
2. Set the temperature in the hot water heater's outer shell. Note that the
setting does not apply to the temperature inside the hot water heater.
Set too high and the heat pump can shut down on a high return or high
pressure switch. Applies to sensor T3 (GT3) only. A higher setting than
45ºC can cause problems.
3. Set the hysteresis for the hot water temperature. The function
measures below and above the value set in menu 2.3. Applies to sensor
T3 (GT3) only. Less than 5ºC should be avoided.
4. Change the time delay for the mixing valve. The opening of the mixing
valve can be delayed to after the boiler has started. This is to prevent
cold water from being mixed into the system before the boiler is hot.
5. Change the time delay for stop of electric/oil-fired boiler. The function
is used to stop the boiler from starting and stopping all the time. For
reasons of safety there is a time delay from when the mixing valve
has not received a signal to open until the boiler may stop completely.
When the boiler has stopped completely, the additional heat timer
must count down to zero again.
6. Here you set the neutral zone for the additional heat mixing valve SV1.
In the neutral zone the mixing valve does not receive an open or close
signal.
7. Ramp time open and close is the time the mixing valve takes to go
from closed to fully open and from fully open to closed. In some cases
the ramp time open (menu 8.3.4) may need to be adjusted to eliminate
overexciting the system.
8. Check whether the mixing valve to the oil-fired boiler opens or closes.
61
Commissioning the heat pump
Mixed add. heat
Setting of SV1
open/close 8.3.6
Return Select
Temperature settings
Heat curve
hysteresis 1.4
Return Select
Hot water settings
Setting of hot water
temperature 2.3
Return Select
Hot water settings
Setting of
DHW hysteresis 2.4
Return Select
Mixed add. heat
Time delay for
mix. valve SV1 8.3.1
Return Select
Mixed add. heat
Time delay for
stop boiler 8.3.2
Return Select
Mixed add. heat
Mixing valve curve
neutral zone 8.3.3
Return Select
Mixed add. heat
Setting of
ramp time open 8.3.4
Return Select
Mixed add. heat
Setting of ramp
time close 8.3.5
Return Select
Additional heat
Show mixing valve
opening 8.6
Return Select