HEAT PUMP WATER HEATER COMPRESSOR CRITERIA
PAGE：8/30
8
Discharge pipe temperature
Discharge pip
e temperature is measured at a distance 300mm from the surface of compressor
and should be less than 110℃. The tip of the thermocouple is fixed by soldering when
measuring discharge pipe temperature .Furthermore, soldering point is covered with urethane
foam to prevent the effect of wind.
9
Dust of compressor hermetic terminals
Compre
ssor hermetic terminals should be mounted with specified cover in right way to prevent
dust entering, and should be used in direction which dust is hard to enter in.
10
Lead wire of compressor hermetic terminals
Measur
ing the temperature of hermetic terminals , lead wire should be resist to the temperature
an
d be clamped so as not in touch with the surface of compressor and pipe.
1
1
Start-stop frequency
The frequency s
hould be less than 6 times per hour. Operating time from start to stop should
be more than 3 minutes. Stopping time should be more than 3minutes.
12 Rate of rotational speed change
The rate o
f compressor rotational speed (acceleration) should be less than 133min
-1
/s, But if
The variable range is below 120min
-1
, rate can also be less than 600min
-1
/s when rotational
speed is reduced to avoid temporary over-current.
13
Air and moisture in refrigerating system
The degree
of vacuum in refrigerating system should be less than 20Pa (150×10
－3
mmHg) at
room temperature just before charging refrigerant. The quantity of water should be less
than 0.15ml.
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