1. Manuals
  2. Brands
  3. Mitsubishi Electric Manuals
  4. Air Conditioner
  5. PURY-P72
  6. Service handbook

Mitsubishi Electric PURY-P72 Service Handbook page 143

Hide thumbs Also See for PURY-P72:
Table of Contents
I
I
\
\
I
[VII
Control)
·5· Bypass Control
Bypass solenoid valves (SV1a), which bypass the high- and low- pressure sides, perform the following functions.
(1) Bypass solenoid valve (SV1a) (ON
=
Open)
Operation
SV1a
ON
OFF
When each indoor unit compressor startup
ON for 4 minutes.
After the restoration of thermo or 3 minutes
ON for 4 minutes.
after restart
During cooling or heating operation with the
Always ON.
compressor stopped
Exception: OFF when 63HS1-63LS is 02MPa[29psi) or Jess
After the operation has stopped
ON for 3 minutes.
Exception: OFF when 63HS1-63LS is 0.2MPa[29psi] or less
During defrost operation
ON
While the compressor is operating at the
When low pressure (63LS) drops
When low pressure (63LS) ex-
minimum frequency and when the low pres- below O.23MPa[33psi].
ceeds 0.38MPa[55psi).
sure (63LS) drops (3 or more minutes after
compressor startup)
When high pressure (63HS1) rises
When 63HS 1 exceeds
When 63HS1 is or below
3.62MPa[525psi]
3.43MPa[497psi] and 30 seconds
have passed
(2) Bypass solenoid valve (SV9) (ON
=
Open)
Operation
SV9
ON
OFF
When high pressure (63HS1) rises during
When 63HS1 exceeds 3.50MPa
When SV5b is ON and the pressure
the heating operation
[507psi]
is 2.70MPa[391psi)or below
Others
Always OFF
(3) Bypass solenoid valve (SV2) (ON
=
Open)
Operation
SV2
ON
OFF
When high pressure (63HS 1) rises during
When SV5b is OFF and the pres-
When 63HS1 exceeds 2.70MPa
the heating operation
sure is 3.S0MPa[S07psi]or below
[391 psi)
When startup or resuming operation after a
OFF
defrost cycle
During defrost cycle
ON
Others
Always OFF
(4) Bypass solenoid valve (SV5b) (ON
=
Open)
Operation
SVSb
ON
OFF
When high pressure (63HS1) rises dUring
When SV2 is OFF and the pressure
When SV9 is ON and the pressure
the heating operation
is 2.70MPa[391psi]or below
is 3.S0MPa[S07psi]or below
At startup
ON
During defrost cycle
ON (open)
When retuming to normal operation after
ON for S minutes and goes OFF
completion of the defrost cycle
Others
Always OFF
HWE0803A
- 133-
GB
Table of Contents
loading

Related Manuals for Mitsubishi Electric PURY-P72

Related Products for Mitsubishi Electric PURY-P72

This manual is also suitable for:

Pury-p168Pury-p192Pury-p240y(t)shmu-aPury-p96Pury-p120y(t)hmu-aPury-p144

Table of Contents