ZYMBO AATT Ventilarredo RX-200/ECO, Service Manual

Page: 76 / 94

ZYMBO AATT
Ventilarredo Service Manual – English Pag. 76
4) If indoor coil temperature sensor is damaged, the protection mode will become obsolete and the unit
will work as the Pre-heat and Post-heat set times.
Static operation in heat mde
1) AUX2(Cold water free contact) and always off.
2) If Tr(Room air temperature) <= Ts(Setting temperature)
﹣
1 ºC, heat operation is activated,
AUX1(Hot water free contact) and MTV2 (Hot water motorized valve) ( is turned on. Indoor fan stop.
3) If Tr(Room air temperature) >Ts(Setting temperature), heat operation is terminated, AUX1(Hot water
free contact) and MTV2 (Hot water motorized valve) is turned off. Indoor fan remain off
4) The range of Ts is 5 °C~30 ºC. If PR setting is activated, Ts range is same as PR setting
5) Indoor fan speed settled on static speed ( no fan ).
6) This setting is only through command on board.
7.4.3.4 Dehumidification mode
** When unit is selected with heat only mode(PR1 setting), dehumidification mode would be invalid.
** There are two logic for Dehumidification mode. When unit is connected with humidistat kit, PCB
would check humidistat automatically, and work with 2nd solution “Humidistat control” accordingly.
Traditional logic
1) AUX1(Hot water free contact) is always off.
2) If Tr(Room air temperature) >= 25 ºC, MTV1(Chilled water motorized valve) and AUX2(Cold
water free contact) will be ON for 10 minutes . After both will be OFF for 6 minutes.
3) If 16 ºC < =Tr(Room air temperature) < 25 ºC, MTV1(Chilled water motorized valve) and
AUX2(Cold water free contact) will be ON for 10 minutes, after both will be OFF for 12 minutes.
4) If Tr(Room air temperature) <16 ºC, MTV1(Chilled water motorized valve) and AUX2(Cold water
free contact) will be turned off for 4 minutes, and check the temperature one more time. At the end of
the above dehumidification cycle, system will decide the next dehumidification control option.
5) Indoor fan will run at low speed throughout the dehumidification process.
6) With dehumidification mode, “ Low temperature protection” is valid.
Humidistat control
Humidistat control:
Humidistat must be connected only to the master unit .
1) AUX1(hot water free contact) is always off.
2) If humidistat contact is ON(close), indoor fan and AUX2(cold water free contact) will be ON.
3) If humidistat contact is OFF(open), indoor fan and AUX2(cold water free contact) will be OFF.
4) Indoor fan will run at 1
st
speed when RH< 70%, or 3
rd
speed when RH>= 70%.
5) During humidistat dehumidification, RH setting range is 40-70%. By pressing temperature Up/Down
buttons to adjust RH set point. Every time by pressing temp Up/Down button, 2% would be adjusted.
6) When Hr(room humidity)
≤
Hs(setting humidity)-2%, no matter how is room temperature, MTV1
and AUX2 would be close.
7) When Hr(room humidity)
≥
Hs(setting hu 2%, unit would work with dehumidification cycle.
8) During dehumidification cycle, the default setting temperature is 22
℃
. When Tr(room temperature)
≥
22
℃
, unit would work with low cooling. When Tr(room temperature)
＜
22
℃
, unit would be on
with 10min, and off with 6 min. When Tr(room temperature)
≤
16
℃
, unit would stop working.
9) Humidistat control is set only by wire wall pad.
10) With dehumidification mode, “ Low temperature protection” is valid.