Gree ULTRA heating GMV5 Multi VRF Series Service Manual page 70

Ultra Heating GMV5 Multi VRF
for North America
(2) Low-pressure protection
Ｍｅ ａｓｕｒｅ ｗｈ ｅｔｈｅ ｒ ｔｈｅ ｌｏｗ
ｐｒｅｓｓｕｒｅ ｉ ｓ ｔ ｏｏ ｌｏｗ ｗｉｔｈ
refr igerant- charging v olum e
C h eck wh ethe r ga s valv e
and liquid v al ve a re o pe n
Ch eck wh ether the
panel of o utdo or u nit is
covered and seal ed wel l
Ch eck wh ether the ai r can blow
sm oo thly a t the heat e xchanger
of i n d oo r un it a nd o utdo or u nit
C h eck wh ethe r the indoor f a n
and ou tdoor fan can op erate
C h eck wh ethe r the indoor
C h eck wh ethe r the el ectr on ic
expa ns ion valv e for indoor
unit a nd o utdoor u nit can
68
Ｌｏｗ ｐｒｅｓｓｕｒｅ
ｐｒｏｔｅｃｔｉ ｏ ｎ
Me asure wh ether the
no
ｍａ ｎｏ ｍｅ ｔｅｒ
yes
yes
C h eck wh ethe r the
is i n s uffi ci en t
no
no
comp letely
yes
no
yes
no
yes
no
yes
no
sw ing blade is o pe n
comp letely
yes
no
op erate no rm ally
yes
no
Blockage f o r s ystem unit a nd mai n pipe , and the expa ns ion valv e for indoor u nit
pipe line and ou tdoor u nit. Replace e lect ronic expa ns ion valv e , dry
yes
R e place ma in b oa rd o f
pressure s witc h is
ou tdoor u nit
no rm al
R e place pressure
no
C h arge r e fri g e rant a ccording to t h e v olum e on n am ep late; check
wh ethe r there‹ s leakage for the syst em
Op en t h e v al ve
comp letely
C o ver the pa ne l of
ou tdoor u nit we ll
E l iminate ob st acles and
sund ri e s
Me asure the ci rcum st ances
of f a n motor a nd s ignal inpu t
Me asure the
ci rcum st ances of s wing
mo tor and si gn al i n p ut
E nga ge v al ve a nd c oil
Ma inly c he ck t h e a ir i n let a nd a ir o utlet conne ct ing indoor
st rainer, ect.
sw it c h