Khd-S1 - Remak VCS Installation And Operating Instructions Manual

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KHD-S1_ _.R Backup System Wiring Diagram
Capacity
control
0...10 V
RKJ
Faults
Unit
HP
Alarm
Comp
Mode:
Heat/Cool
ON/OFF
Main switch
Failure
T
D
Note: The 4-way valve is displayed in the "cooling" position (SV
without power); the E1 heat-exchanger is in evaporator mode.
Function description
Unit start and operating mode (heating/cooling) can be selected by an external signal. The E2 heat exchanger is alternatively
used for heating or cooling of fresh air supplied to the air-conditioned object. The heat potential of the outlet air is always used.
In winter, the outlet air transfers the heat to the E1 heat exchanger. Thus, heat recovery is achieved. The unit works in heat pump
mode. The valve is without power. Cold inlet air is heated in the E2 heat exchanger (condenser).
In summer, fresh air is cooled as needed in the E2 heat exchanger. The SV valve is energized and the 4-way valve is moved to
the opposite position. The E2 heat exchanger now works as an evaporator. Relatively cold outlet air exhausted from the building
effectively cools the E1 heat exchanger (condenser). Surplus heat is transferred out of the building.
Proper functionality of the system is ensured by the control switchboard (RKJ) with the integrated PLC control system. The
application software optimises the unit's operation and protects it against overloading. The heat recovery level can be steplessly
controlled (0...10V signal) depending on the inlet air temperature TA (behind the E2 heat exchanger). If the maximum permissible
condensation temperature is reached, the output is automatically reduced. The system is also protected against freezing of the
evaporator by an automatically limited lowest evaporation temperature.
110
Header
Filter
Filtr
SG
SV
HP
HPA
(21/28bar)
4...20 mA
Valve in position
without power
(Cu8 -50)
C1
SV1
LP
LPA
(1.7/2.7bar)
4...20 mA
Z3
Z4
Z2
Z1
Legend:
C1
Cooling compressor
SV1
Power valve
SV
4-way valve
SG
Sight glass
EX
Expansion valves
E1, 2 Evaporator/condenser
Td, Ts Temperature sensors
Z1-4 Back valves
LP
Low-pressure pressostat
HP
High-pressure safety pressostat
RKJ
Unit power and control distribution board
TA
Room temperature
T
A
E2
Fresh air
EX2
E1
Relief air
EX1
Building wall

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