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Table 3.1 List of Protective Devices
Description
Pressure differential switch for
chilled/hot water
Chilled water low temp. switch
Inter lock for cooling water pump
Gas high pressure switch
Gas low pressure switch
Air pressure switch
Flame detector
Pressure switch for high pressure
generator
Float less switch for high pressure
generator
Temperature switch for high
pressure generator
Exhaust gas temperature switch
Over-current relay for forced fan
motor
Over-current relay for solution
pump #1 motor
Over-current relay for solution
pump #2 motor
Over-current rely for solution
pump #1 motor
Symbol
Set Point
63EW
Approx. 80% of
Contact to be open when
rating flow
flow falls
TE-1
3.5℃
Protected when temp.
falls
CWR
-
Voltage contact signal for
pump start
63FH
120% of gas
Contact to be open when
rating pressure
gas pressure rises
63FL
50% of gas
Contact to be open when
rating pressure
gas pressure falls
63DS
50% of rating
Contact to be open when
pressure
air pressure falls
－
UV
Detect misfire and
reduced fire
63GH
0kg/㎠
Contact to be open when
pressure rises
－
LC-01
Relay to trip when sol.
level falls
TE-3
170℃
Protected when sol.
Temperature rises
TE-4
350℃
Protected when exhaust
gas temperature rises
49FM
Rating current
Relay to trip when motor
over-current
M1-49
Rating Current
Rely to trip when motor
over current
M5-49
Rating Current
Rely to trip when motor
over current
INV1
Rating current
Do
Active Condition
Combustion shut-down, sol. pump
and refrigeration pump stop
Instantaneous combustion shut-
down and dilution operation
22
Protective Action
Freeze and boiling prevention
Do
Freezing prevention
High pressure generator
protection
Do
Abnormal combustion protection
(Applied for gas fired type)
Do
(Applied for gas fired and oil fired
with proportional control type)
Do
(Applied for gas fired and oil fired
with proportional control type)
Do
Do
High pressure generator
protection
Do
Void combustion prevention
Do
High pressure generator
protection
Do
Abnormal combustion prevention
Do
Forced fan motor protection
Do
Solution pump Motor #1
Do
Solution pump Motor #2
Protection
Do
Solution pump #1 motor
protection(option)
Protection Purpose
Do
Do
Do
Protection
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