Johnson Controls HIDH018B21S, Engineering Manual

Page: 154 / 668

OUTDOOR UNITS
2-114
TC-15001-rev.3
1
2
3
No
Yes Big
Small
Heating Operation
Defrosting Operation
RVR2 : OFF
RVR1 : ON
RVR1 : OFF
Outdoor FAN MOF : OFF
Temperature Difference
between Outdoor Temperature
and Evaporating Temperature (Te)
at Heat Exchanger
Heating Operation Time
40 minutes or Above
No No
Yes
No
Yes
Discharge Gas Pressure
is 450psi(3.1MPa) or Above
and
Defrosting Time is
20 seconds or Above
Evaporating Temperature
(Te) at Heat Exchanger is
59°F(15°C) or Above
and
Pd > 218psi(1.5MPa)
Yes
No
Pd > 479psi(3.3MPa)
and
Defrosting Time is
less than 20 seconds
Yes
Defrosting Time is
9 minutes or Above
Defrosting
Completion
Fixed Opening
Degree of Electronic
Expansion Valve
PID Control for
Super Cooling Electronic
Expansion Valve
RVR2 : ON
Compressor Operating
at Low Frequency
High Frequency
Operation
1 Minute Later
Heating Operation
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number
Temperature
Conditions
under
Defrosting
Operation
Defrosting Operation
Stop Area
Defrosting Operation
Start Area
Outdoor Temperature [°F(°C)]
28
(-2)
14
(-10)
-6
(-21)
5
(-15)
23
(-5)
42
(6)
59
(15)
Outdoor Evaporating
Temperature (T
e) [°F(°C)]
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