Daikin DPS Installation And Maintenance Manual page 88

Table 62: Alternate Initialization Sequence
Device
Inverter Compressor & Comp 3
Inverter Compressor Only
Outdoor Fan
4 Way Valve
(Heat Pump only)
Outdoor Coil
Expansion Valve (EVO)
(Heat Pump only)
SVR (Heat Pump only)
SVB
Indoor Coil Expansion Valve (EVI)
Time Duration
A . Inverter compressor speed is increased until the 4-way valve is seated (discharge minus suction pressure >57 psi) and as
long as the suction pressure is above 43 psi . inverter compressor speed is also increased if the suction pressure remains
above 71 psi . Comp 3 turns on if the inverter compressor speed is at maximum and these conditions are not met . Comp 3
is turned back OFF after 20 seconds if the suction pressure drops below 43 psi .
B . Outdoor fan capacity is controlled to maintain the discharge pressure between 171 psi and 221 psi . Outdoor fan capacity is
set to 100% if discharge pressure is above 427 psi . Outdoor fan capacity runs at least at minimum capacity if inverter board
(fin) temperature >167°F.
C . EVI is controlled to keep the suction superheat between 3 .6°F and 14 .4°F .
D . Alternate Initialization lasts a maximum 15 minutes . It is completed early anywhere between 10 seconds and 15 minutes if
once the 4-way valve is seated (differential pressure above 57 psi and the discharge superheat above 9 .0°F) .
OM 1141-3 • MICROTECH UNIT CONTROLLER
Step 1
Inverter Compressor Speed=Minimum
Comp3=Off
Inverter Compressor Speed= Minimum
Outdoor Fan=0%
OFF
EVO=100%
Closed
Normally Open
Close if Discharge superheat>9°F
EVI= 0%
5 seconds
Step 2
Inverter Compressor Speed=Smaller of Step 12 or Maximum
Comp3=Off
If OAT≥50°F or RAT≥73°F, Inverter Compressor Speed=Smaller of Step
12 or Maximum
If OAT<50°F & RAT<73°F, Inverter Compressor Speed= Minimum
5 seconds
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Step 3
A
A
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D