Mitsubishi Electronics P500YMF-C, PURY-P400 specifications SV1

2) Bypass solenoid valves (SV1, SV4) [Both SV1 and SV4 are on (open)]

Item	SV1					SV4a
	ON		OFF		ON			OFF
At compressor is started	ON for 4 minutes					—
Compressor stopped during cool-	ON					—
ing or heating mode
After operation has been stopped	ON for 3 minutes					—
During defrosting ((*1) in Fig below)	ON				Normally ON
During oil recovery operation	ON during oil recovery operation af-					—
	ter continuous low-frequency com-
	pressor operation.
When low pressure (Ps) has
dropped during lower limit fre-	—			Ps < 1.0 kg/cm2G			Ps	2.0 kg/cm2G
quency operation(15 minutes af-					(0.098 MPa)			(0.196 MPa)
ter start)
When the high pressure (Pd) is	Pd 27.5 kg/cm2G	Pd	24 kg/cm2G	Pd	27 kg/cm2G		Pd	24 kg/cm2G
	(2.70 MPa)	(2.35 MPa) and
risen up during lower limit fre-					(2.65 MPa)		(2.35 MPa) and after
quency operation (3 minutes after		after 30 seconds.
							30 seconds
starting)
When the discharge temperature					130° C			°
					(No. 1 compressor)			115 C
(Td) is risen up	—			• Td >			Td	(No. 1 compressor)
					115° C			100° C
					(No. 2 compressor)			(No. 2 compressor)
				and
				• Pd > 20 kg/cm2G
				or	(1.96 MPa)
				Ps < 3.5 kg/cm2G
					(0.34 MPa)
* Example of operation of SV1

Compressor

Bypass

solenoid Start valve (SV1)

(4-minute)

Thermo. Thermo.

OFF ON

(2-minute)

Defrost

(4-minute)

Stop

(3-minute)

3)Capacity control solenoid valve (SV22, SV32). :P500 only

• Operation of solenoid valve

Solenoid valve	SV22		SV32
Status	Coil	Valve	Coil	Valve
Full-load
(Operating at 100 %	OFF	Open	OFF	Closed
capacity)
Un-load
(Capacity control	ON	Closed	ON	Open
operation)

SV22

SV32

COMP

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