Hitachi UTOPIA RAS-4HVRP2E - Alternate Defrost Mode (F5); Defrost; Intermittent Operation of Outdoor Fan (F1)

6 Optional functions
RAS-3HVRC2
SMGB0136 rev.0 - 07/2021
122
6.1.3.19 Intermittent operation of outdoor fan (F1)
It can be used as a simple snow prevention measure (auxiliary function) for outdoor fans.
Intermittent operation of outdoor fan is enabled when external input function number “4” is set or when function selection
setting “F1” is set to “1” to “4”. When the outdoor unit is stopped (compressor is stopped), the fan of the outdoor unit
starts intermittent operation when the outdoor air temperature becomes 10°C or lower, and stops when the outdoor air
temperature becomes 16°C or higher.
If the outdoor unit is operated (compressor is operated) in this state, the fan of the outdoor unit will switch to normal
operation.
The operation during intermittent operation of the outdoor blower is as shown below.
Fan operation
Fan stop
A (s)
600 s
? NOTE
Repeatsintermittentoperationwith600[s]asonecycle.
Setting condition Operation mode Outdoor fan operation time A(s)
0 Not available (default setting) Continuous operation (600 s)
1 Outdoor Fan Start/Stop Operation 1 30
2 Outdoor Fan Start/Stop Operation 2 60
3 Outdoor Fan Start/Stop Operation 3 120
4 Outdoor Fan Start/Stop Operation 4 300
? NOTE
• Thisfunctionisanauxiliaryfunctiontopreventsnowaccumulation.Insnowfallareasorareaswheresnowaccumulates,thepropeller
fanmaybreakduetosnowfall.Insnowfallareasorareaswheresnowaccumulates,besuretoinstallasnow-proofroof,enclosure,
snow-proofhood(optionalpart),etc.ontheoutdoorunittopreventthepropellerfanfromcrackingduetosnowfallorabnormalvibra-
tionduetounbalancedpropellerfan.
• Ifthefanmotormalfunctionsduringoperationwiththisfunction,thefanoftheoutdoorunitwillbestoppedandthisfunctionwillbe
suspended.Asforthealarmcode,therelevantalarmwillbereportedthenexttimetheoutdoorunitisoperated(whenthecompressor
isoperating).Pleasecheckthecontentsofthealarmcodebeforetakinganyaction.
• Whenusingtheunit,topreventinjuryduetounexpectedfanoperation,indicateonaclearlyvisiblepartoftheunitthatthefanisset
tooperatewhiletheoutdoorunitisstopped(compressorisstopped).
6.1.3.20 Alternate defrost mode (F5)
When “F5” is set to “1” for “Alternate defrost mode” in the function selection, defrosting is performed alternately when
there are two or more outdoor units connected to H-LINK II.
Setting condition Operation mode
0 Not available (default setting)
1 Effectivity of Alternation Defrost Mode
The other outdoor unit will not defrost until the other outdoor unit nishes defrosting.
Prepare for Defrosting
Prepare for Defrosting
Defrost
Prepare for Defrosting Defrost
Delay