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AUTO FRESH DEFROSTING
:
* If auto fresh conditions are established when heating operation stops, defrosting operation can be executed during the stop period.
Auto fresh defrosting consists of [balancing period of 90 seconds when defrosting starts > reverse cycle period for 12 minutes maximum]
.
(1) Auto fresh defrosting start conditions
* Auto fresh defrosting is performed when all the following conditions are satisfied:
1) Heat-exchanger at low temperature (heat-exchanger temperature
& DEF -> ON)
2) Units in all cycles stop
3) Auto fresh defrosting inhibit time (15 minutes) is up
4) Compressor is tumed on during operation stop
5) There is a delay of compressor from indoor units during operation stop
(2) Auto fresh defrosting stop conditions
* Auto fresh defrosting is released when any of the following conditions is established:
1) Heat-exchanger temperature is recovered (heat-exchanger temperature=DEF — OFF)
2) Maximum defrosting time (12 minutes) is up
3) A failure occurs
4) Either indoor unit of all cycles starts operation.
% Release during balancing at start: To stop or start operation when remaining balancing time is up.
Release during reverse cycle period: To stop or start operation when balancing time (3 minutes) is up.
(3) Outputs during auto fresh defrosting
[Defrosting request between outdoor microcomputers] Not to be transferred.
[Indoor defrosting request] To be transferred only to object unit of auto fresh defrosting (indoor unit which has stopped last).
[Compressor] To increase the speed at the rate of DFSTEP rpm/TDFSPT second and reach the maximum defrosting speed [DEFMAX}.
[Expansion valves] Non-object units of auto fresh defrosting : To be fully closed when defrosting starts and the balancing time (30 seconds) is up.
Object units of auto fresh defrosting: To be opened by [DFSPPS] pulses, synchronized with a step-up of rotation speed, and fully opened
(4) Special remarks
{DFPSMX] when the speed reaches [DEFMAX].
¢ Other cycles should remain in the stop mode.
* When operation stops during defrosting, the unit should directly shift to auto fresh defrosting.
* All indoor units should stop for auto fresh defrosting. Therefore, if two cycles stop operation simultaneously, auto fresh defrosting will not
commence because of delay in communications.
Defrosting signal
Detrosting request
outdoor microcomputers
a ont
AC
5 [sawn |
urns on
F | toreoaing
Tums on
for heating
Heating output
z
Auto fresh inhibit period 15 s
Balancing period of 90s' | Reverse cycle period (max. 12 minutes)
Balancing periodo! 3 minutes
1
'
1
@Detrosting sequence!
DFSTEP mins
DERMAS
TDFSI
Compressor
rotation speed
DFCTPS
Expansion
valve
3 © See other sections for details of expansion valve TD control, AN correction and distribution control.
* TSKTM1, SDRCT1, DFSTEP, TDFSPT, DEFMAX, DFCTPS, DFSPPS, DFPSMX and PCLOSH are EEPROM data.
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