SiUS281811EA Special Control
Part 4 Functions and Control 111
3.1.2 Startup Control in Heating
Outdoor unit
actuator
Electric Symbol
Pressure equalization
control prior to startup
Startup control
18/24
class
30/36/42/48
class
STEP 1 STEP 2
Compressor M1C M1C 0 Hz Minimum
frequency
Increases 2 steps every 20
seconds from minimum
frequency until
Pc – Pe > 0.39 MPa
(56.6 psi) is achieved
Outdoor fan M1F M1F
M2F
From starting
Ta > 20°C (68°F): STEP 1
Ta ≤ 20°C (68°F): OFF
STEP 8 STEP 8
Main electronic
expansion valve
Y1E Y1E 0 pulse 0 pulse 0 pulse
Subcooling
electronic
expansion valve
— Y3E 0 pulse 0 pulse 0 pulse
Four way valve Y1S Y1S Holds ON ON
Hot gas bypass
valve
Y2S — OFF OFF OFF
Ending conditions A lapse of 10 sec.
• Pc – Pe < 0.3 MPa
(43.5 psi)
•
A lapse of 1 to 5 min.
OR
x A lapse of 130 sec.
x
x
Pc > 2.70 MPa
(392 psi)
Pc – Pe > 0.39 MPa
(56.6 psi)
OR
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