EasyManuals Logo

Fujitsu ASU18RLF Service Manual

Fujitsu ASU18RLF
100 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #30 background imageLoading...
Page #30 background image
3. Defrost Flow Chart
The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.
3 sec later Compressor : OFF
3 sec later Outdoor fan motor : OFF
35sec later 4WAY valve : OFF
41sec later Compressor : ON
Heating operation start : Compressor ON
Outdoor HEX temp. : Over 59°F(15°C)
Compressor ON time : Maximum 15 minutes
Defrost end
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
Defrost start
Tn < 1.4°F(-17°C)
Ta > 14°F(-10°C)
Tn < 0.8 ×Ta - 11.6
Tn < -18.4°F(-28°C)
=
=
Tn - Tn-1 < 28.4°F(-2°C)
and Sn = Sn-1
=
Ta < 4°F(-20°C)
Normal defrost Integrating defrost Integrating defrost
(Integrating OFF count defrost)
4°F(-20°C) < Ta < 14°F(-10°C)
Tn < 21.2°F(-6°C) More than 210 minutes
( For continuous operation )
or
Tn < 26.6°F(-3°C)
(and after 30 minutes,
if the Tn < 26.6°F(-3°C)
(and after 3 minutes,
if the Tn < 23°F(-5°C)
Tn < 23°F(-5°C)
or
=
=
Tn < 0.8 ×Ta - 11.6
Tn < -18.4°F(-28°C)
=
=
=
Compressor OFF count :
40 times
(Less than 10 minutes)
or or
Tn
Ta
Tn-1
Sn
Sn-1
: Outdoor heat exchanger temp.
: Outside air temp.
: Before 5 minutes detected Tn
: Number of operation indoor units
: Before 5 minutes detected Sn
01-27

Table of Contents

Other manuals for Fujitsu ASU18RLF

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Fujitsu ASU18RLF and is the answer not in the manual?

Fujitsu ASU18RLF Specifications

General IconGeneral
BrandFujitsu
ModelASU18RLF
CategoryAir Conditioner
LanguageEnglish

Related product manuals