Johnson Controls YVAHP0721CW Series, Service Manual

Page: 380 / 416

5-20
SM-16007
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.
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)]
< Night Shift >
Reduction Rate of Maximum
Outdoor Fan Rotation Compressor Frequency
“ ni ” Setting
Condition
Operation
Cooling
(Including Dry Operation)
Heating
Cooling
(Including Dry Operation)
Heating
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 Heating Operation
86 (30) 92 (33)
75%
90%
Outdoor Temperature [
o
F (
o
C)]
Reduction Rate
of Upper Limit
Outdoor Fan
Radiation