Daikin DPS Installation And Maintenance Manual page 117

Table 67: Alternate Initialization Sequence
See page 86 for more information about what is a compressor "step".
Inverter Compressor & Comp 3
Inverter Compressor Only
Outdoor Fan
4 Way Valve (HeatPump)
Outdoor Coil Expansion Valve (EVO)
(HeatPump)
SVR (HeatPump)
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 discharge pressure is below 221 psi . inverter compressor speed is also increased if the discharge pressure
remains below 171 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 discharge pressure rises above 221 psi .
B . The outdoor expansion valve is controlled to keep the suction superheat between 3 .6°F and 5 .4°F .
C . 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 either the discharge superheat above 18°F or the
discharge pressure is above 384 psi) .
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Step 1
Inverter Compressor Speed=minimum
Comp 3=Off
Inverter Compressor Speed=minimum
Outdoor Fan=100%
ON
B
Closed
Normally Open
Closed If Discharge superheat>18°F
EVI=100%
5 seconds
Step 2
Inverter Compressor Speed=Smaller of Step 12 or
Maximum
Comp 3=Off
If OAT≤59°F, Inverter Compressor Speed=
Smaller of Step 12 or Maximum
If OAT>59°F, Inverter Compressor Speed=minimum
5 seconds
117 OM 1141-3 • MICROTECH UNIT CONTROLLER
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Step 3
A
A
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C