Temporary Operation; Pulse Modulating Valve (P .M.v.) Control - Carrier 42NQV050M Service Manual

Item Operation flow and applicable data, etc.
10. Temporary Pressing [RESET] button starts the temporary opera-
tion of [AUTO] operation. When keeping [RESET]
operation
button pressed for 10 seconds or more, the temporary
[COOL] operation is performed.
Filter lamp ON
NO
Did you press [RESET] button
for 3 seconds or more?
YES
Did you press [RESET] button
for 10 seconds or more?
NO
Switch to [AUTO RESTART] control.
This function controls throttle amount of the
11. Pulse
refrigerant in the refrigerating cycle.
Modulating
valve
According to operating status of the air conditioner,
(P.M.V.)
this function also controls the open degree of valve
control
with an expansion valve with pulse Modulation.
Starting up
Initialize
Move to
initial position
SH control
PMV open degree control
Stop by
remote controller
Power OFF
* SH (Super Heat amount) =
Ts (Temperature of suction pipe of the compressor) –
Tc or Te (Heat exchanger temperature at evaporation side)
* PMV: Pulse Modulating Valve
YES
Press RESET button.
NO
Temporary [AUTO] operation
YES
Temporary [COOL] Operation
Compressor ON
Td
release control
Room temp. sensor
(Ta sensor) control
– 36 –
1) When pressing [RESET] button, the
temporary [AUTO] operation starts.
2) When keeping [RESET] button pressed
for 3 seconds or more, Pi, Pi, Pi sound is
heard and [AUTO RESTART] control is
changed.
3) When keeping [RESET] button pressed
for 10 seconds or more, "Pi" sound is
heard and the temporary [COOL]
operation starts.
4) If the filter lamp goes on, press [RESET]
button to go off the filter lamp, and then
press [RESET] button again.
5) To stop the temporary operation, press
the button again.
1) When starting the operation, move the
valve once until it fits to the stopper.
(Initialize)
* In this time, "Click" sound may be
heard.
2) Adjust the open degree of valve by super
heat amount. (SH control)
3) If the discharge temperature was exces-
sively up, adjust the open degree of valve
so that it is in the range of set tempera-
ture.
(Discharge temp. control)
4) When defrost operation is performed, the
open degree of valve is adjusted accord-
ing to each setup conditions during
preparation for defrost and during defrost
operation (4-way valve is inversed.).
5) To turn off the compressor while the air
conditioner stops by control of the
thermostat or by remote controller, adjust
the open degree of valve to the setup
value before stop of the compressor.
Defrost
FILE NO. SVM-10052
Description