Johnson Controls YVAHP072B31S, Service Manual

Page: 1677 / 1796

Service Manual
5-21
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING
NOTE:
Reduction rates are approximate, these may change slightly depending on the outdoor unit model.
(2) Night Shift (Low Noise) (Function Setting “ni”)
Press “PSW3” and select the setting condition “1” or “2” for the Night Shift (Low Noise) “
”. Then, this
function can be set. “ni”=1 reduces the upper limit of the outdoor fan rotation and the compressor frequency
as shown below in any operation. “ni”=2 is adapted only for cooling operation. In heating operation, “ni”=2
is same as “ni”=0.
The Night Shift operation should be used if the capacity has the margin to be allowed for the capacity
decrease and the low sound operation is required especially in the nighttime.
< Night Shift >
at Heating Operation
Reduction Rate of Upper Limit
Outdoor Fan Radiation
= 75%
at Cooling Operation
Reduction Rate
of Upper Limit
Outdoor Fan
Radiation
72 (22) 77 (25)
65%
75%
90%
86 (30) 92 (33)
Outdoor Temperature [
o
F (
o
C)]
Reduction Rate of Maximum
Outdoor Fan Rotation Compressor Frequency
“ ni ” Setting
Condition
Operation
Cooling
(Including Dry Operation)
Except for
Cooling
Cooling
(Including Dry Operation)
Except for
Cooling
0
No Effect
(Default Setting)
Not Changed
(=100%)
Not Changed
(=100%)
Not Changed
(=100%)
Not Changed
(=100%)
1 Night Shift1 Shown as below Shown as below 60% 60%
2
Night Shift2
(only for Cooling)
Shown as below Not Changed 60% Not Changed
at Heat Recovery Operation
86 (30) 92 (33)
75%
90%
Outdoor Temperature [ o F (
o
C)]
Reduction Rate
of Upper Limit
Outdoor Fan
Radiation