MrCool DIY-MULTI2-18HP230C, Service Manual

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 Product Features 2 
1. Abbreviation
Unit element abbreviations
Abbreviation Element
T1 Indoor room temperature
T2 Middle indoor heat exchanger coil
temperature
T2B Indoor heat exchanger exhaust coil
temperature (located on the outdoor
unit)
T3 Coil temperature of condenser
T4 Outdoor ambient temperature
TP Compressor discharge temperature
2. Electric Control Working
Environment
• Input voltage: 198V~264V.
• Input power frequency: 50/60Hz.
• Indoor fan standard working amp.: <1A
• Outdoor fan standard working amp.: <1.5A.
• Four-way valve standard amp.: <1A.
3. Main Protection
3.1 Compressor three-minute delay at
restart
Compressor functions are delayed for up to one minute
upon the first startup of the unit, and are delayed for up to
three minutes upon subsequent unit restarts.
3.2 Automatic shutoff based on fan speed
If the outdoor fan speed registers below 100RPM or above
2400RPM for an extended period of time, the unit ceases
operation and the corresponding error code is displayed on
the outdoor unit.
3.3 Temperature Protection of Compressor
Discharge
When the discharge temperature of the compressor rises,
the running frequency is limited according to the following
rules:
• If TA ≤ TP<TB maintain the current frequency.
• If the temperature increase and TP≥TB, decrease the
frequency to a lower level every 2 minutes till to F1.
• If TP≥TC for 10 seconds, the compressor stops and
then restart untill TP<90°C (194°F).
R32 models:TA=100°C (212°F), TB=103°C (217.4°F),
108°C (226.4°F)
Other models: TA=105°C (221°F), TB=110°C (230°F),
115°C (239°F)
3.4 Voltage Limit Protection
If AC voltage registers below stop value for an extended
period of time, the corresponding error code is displayed
on the indoor unit and the unit ceases operation. After 30
seconds, if AC voltage is greater than the restart value.
3.4 Compressor Current Limit Protection
The temperature interval for the current limit is the same
as the range of the T4 frequency limit.
3.4.1 Cooling mode:
CoolReturnI The difference between current limit and
shutdown current
CoolT4Zone5I Cooling T4≥50°C current limit value
CoolT4Zone4I Cooling 49°C>T4≥45°C current limit
value
CoolT4Zone3I Cooling 44°C>T4≥41°Ccurrent limit
value
CoolT4Zone2I Cooling 40°C>T4≥33°C current limit
value
CoolT4Zone1I Cooling 32°C>T4current limit value
CoolStopI
Cooling stop protection current value