25
Par
t 3 - I
nstalla
tion and F
ield S
ettings
TW_COOL_DIFF sets the minimum temperature difference between the total leaving water temperature (Tw) and the total
leaving water set temperature (TwS) above which the unit will start for cooling mode. When Tw - TwS ≥ TW_COO 1,
unit starts. When TwoS - Tw ≥ 2 lasts for 5s, unit stops.
TW_HEAT_DIFF sets the minimum temperature difference between the total leaving water temperature (Tw) and the total
leaving water set temperature (TwS) above which the unit will start for heating mode. When TwS – Tw ≥ TW_HEA 1,
unit starts. When Tw - TwS ≥ 1 lasts for 5s, unit stops.
RATIO_COOL_FIRST sets the number of initial startup units for cooling mode.
RATIO_HEAT_FIRST sets the number of initial startup units for heating mode.
1.2.5 SET UNIT PROTECTION
MENU > Project Menu > SET UNIT PROTECTION
T_DIFF_PRO set the absolute difference between entering water temperature(Twi) and leaving water temperature(Two). If |
|Twi - Two | ≥ T_DIFF_PRO, unit stops and error code P9 appears. When | Twi - Two | ≤ 6, error code disappears.
TWI_O_ABNORMAL sets the difference between entering water temperature(Twi) and leaving water temperature(Two). For
cooling mode, if Two – Twi ≥ TWI_O_ABNORMAL and lasts for 20min, unit stops and error code PA appears. If Two – Twi ≤ TWI_
O_ABNORMAL – 1, error code disappears. For heating mode, if Twi – Two ≤ TWI_O_ABNORMAL and lasts for 20min, unit stops
and error code PA appears. If Two – Twi > 1 - TWI_O_ABNORMAL, error code disappears.
1.2.6 SET DEFROSTING
MENU > Project Menu > SET DEFROSTING
T_FROST sets the time between the end of the last defrost mode and the beginning of the next defrost mode.
T_DEFROST_IN sets the temperature for T3 of entering defrosting mode. When T3 reaches T_DEFROST_IN, unit enters
defrosting mode.
T_FROST_OUT sets the temperature for T3 of exiting defrosting model. When T3 reaches T_DEFROST_IN, unit exits defrosting
mode.
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