Toyotomi MTN-MTG 256DV Service Manual page 28

9.11 Action of Electronic Expansive Valve
Electronic Expansive Valve (EEV) is controlled according to the discharge temperature.
Opening range of EEV is 80p~480p.
EEV will be closed completely(-520p) when the unit is firstly got through the power.
Then it will be at the maximum opening(480p) and the unit will be standby.
EEV will be open at different initial openings after compressor's start in different running modes.
Initial opening will be kept for 3 minutes before it is controlled according to the discharge temperature.
Mode
Cooling/Drying
Heating
EEV will be adjusted to opening-target immediately when discharge temperature increases.
EEV will be adjusted to opening-target gradually(take action every 2 minutes) when discharge temperature decreases.
In cooling or dry mode:
PMV_COOL_UTEMP3_ADD
PMV_COOL_UTEMP2_ADD
PMV_COOL_UTEMP1_ADD
In heating mode:
PMV_HEAT_UTEMP3_ADD
PMV_HEAT_UTEMP2_ADD
PMV_HEAT_UTEMP1_ADD
EEV opening will be PMV_DEFROST_PLS_ADD during defrosting.
EEV opening will be fixed at PMV_COOL_RAT_PLS_ADD when the unit is on rating cooling capacity test.
EEV opening will be fixed at PMV_HEAT_RAT_PLS_ADD when the unit is on rating heating capacity test.
When the unit is turned off, EEV will be closed completely(-160p) and then be at the maximum opening(480p).
Initial opening of EEV
PMV_COOL_INIT_ADD
PMV_HEAT_INIT_ADD
PMV_COOL_PLAT4_ADD
PMV_COOL_PLAT3_ADD
PMV_COOL_PLAT2_ADD
PMV_COOL_PLAT1_ADD
PMV_HEAT_PLAT4_ADD
PMV_HEAT_PLAT3_ADD
PMV_HEAT_PLAT2_ADD
PMV_HEAT_PLAT1_ADD
PMV_COOL_DTEMP3_ADD
PMV_COOL_DTEMP2_ADD
PMV_COOL_DTEMP1_ADD
PMV_HEAT_DTEMP3_ADD
PMV_HEAT_DTEMP2_ADD
PMV_HEAT_DTEMP1_ADD
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