Toshiba Estia RUA-CP1701H, Service Manual

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Monobloc Outdoor Unit Service Manual
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8. Operational description
This chapter describes the working circuit and control of Air to Water Heat Pump about the following operations.
8.1. Basic Operation
8.1.1.
Operation control
Remote controller (WUI)
MonoBloc outdoor unit
Compressor control
1. Purpose
The operation of the Monobloc outdoor unit
are controlled according to user-defined
operating / condition setting.
2. Details
The operation controls include those shown on
the left.
3. Operations
a) An operation condition is selected with the
remote controller.
b) Setting the remote controller button to “ON”
transmits a signal to the NHC PCB.
c) The NHC PCB controls the operations
shown on the left while also controlling the
water 3-way valve, circulation pump, hot water
cylinder
heater, and backup heater.
d) The NHC PCB transmits an operation
instruction to MCC-1599 (interface PCB), and
uses serial signals to transmit and receive the
control status.
e) MCC-1599 performs the operation control
shown on the left while also controlling the
compressor, outdoor fan motor, pulse motor
valve, and 4-way valve.
Selection of
operating condition
Heating: Start/Stop
DHW: Start/Stop
Cooling: Start/Stop
Serial signal:
transmit & receive
Remote controller functions:
i)
Heating – ON/OFF
ii) DHW ON/OFF
iii) Cooling ON/OFF
iv) Setpoint temperature control
v) Holiday mode
vi) Alarm display
vii) Header/follower control
viii) Time & schedule setting
New hydronic
control PCB
(NHC)
Serial signal:
transmit & receive
JBus/Modbus communication
ON / OFF input
Mode (CLG/HTG) input
Comfort/ECO input
Safety switch input
Water flow switch input
User defined input # 1
User defined input # 2
User defined input # 3
User defined input # 4
DHW tank temp. sensor
Chiller water system temp.
sensor
Indoor air temp. (room sensor)
Outdoor air temp. sensor
DHW diverting valve
Electrical heater EH#1 /
boiler ON/OFF
User defined output # 1
User defined output # 2
Variable speed pump-PWM
Additional fixed speed
pump ON / OFF
Main water pump ON/OFF
Compressor control
Monobloc unit control
Inverter frequency control
Waveform synthesis function
Calculation function (Temperature
calculation)
AD conversion function
Rapid heating function
Compressor restart
Delay function
G-Tr overcurrent prevention function
Defrosting operation function
Inverter
Compressor
CDU fan
Td sensor
Ts sensor
Te sensor
To sensor
PMV
4 way valve