Johnson Controls (H, Engineering Manual

Page: 12 / 124

FEATURES
1-2
TC-16006
Improved Defrosting Function
Ŷ Sensor Function for Frost Formation on Coil
The newly-adopted sensor function detects frost formation on the coil.
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the defrosting operation is decreased.
The interval for defrosting can be extended approximately to a maximum of 250 minutes.
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Advanced Technologies to Provide High Heating Performance
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Heat is
Absorbed into
Heat Exchanger
Heat is
Absorbed into
Heat Exchanger
Current
Model
New
Model
Heating Heating Heating Heating Heating
Heating Heating Heating
Defrosting Period (Including heating start-up time)
Extended Max. 250 Mins.
Reverse Cycle Hot Gas Bypass
In case of much frost formation qty., residual heat
from the indoor unit heat exchanger and the piping is
used for defrosting. In case of less frost formation qty., waste heat from
the compressor is used for defrosting.
Advantage:
Defrosting Performance:
High
Disadvantage:
Start-Up Heating Time:
Normal
During defrosting, indoor
heat exchanger & piping get
cold.
Advantage:
Start-Up Heating Time:
Fast
Disadvantage:
Defrosting Performance:
Normal
Less frost formation on the coil
э
Hot Gas Bypass
High defrost performance is needed э Reverse Cycle
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compressor, heating performance under the low
ambient temp. conditions is improved without
using burner or electric heater. Heating operation
is available under -13
o
F (-25
o
C) of ambient temp.
circumstances.
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Defrosting operation concurrently with heating
cycle is available without switching four-way
valve for defrosting.
Adequate quantity of liquid refrigerant is
provided to each compressor, and injected
into the intermediate pressure chamber of
compressor.
Liquid Injection Circuit
High Circulating Qty.
at High Pressure Side
Liquid
Injection
+
Gas
Liquid
Injection
Gas
(Conceptual
Drawing)
Enthalpy
Pressure
Indoor Unit
Scroll Compressor
(equipped
with
Liquid
Injection)
Outdoor Unit
Hot Gas Bypass Circuit
With this circuit, discharge gas from
the compressor is directly distributed
to the heat exchanger without
switching 4-way valve during
defrosting operation.
(Conceptual Drawing)
4-way Valve
Expansion
Valve
Heating Cycle
Hot Gas Bypass
Sub-Heat Exchanger
Protect heat exchanger bottom
Liquid Injection Cycle
Flow Control
Valve
Outdoor Heat
Exchanger
Fixed
Speed
Compressor
Inverter
Compressor
Indoor Unit
Heat
Exchanger
Expansion
Valve