Low Noise Mode; Setting And Corresponding Operations; Low Noise Mode And Operation Contents; Automatic Switching - Fujitsu Airstage VR-II Series Service Manual

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Low noise mode

When the low noise mode setting ON from Push SW or External input or System controller Input, the outdoor unit operates
in the low noise mode as follows.
«

Setting and corresponding operations

External Input (CN131)
or
on Master O.U
ON
«

Low noise mode and operation contents

LOW NOISE MODE
LOW NOISE MODE
The operating noise is reduced by limiting the rotational speed of compressor and fan motor
LOW NOISE MODE
LOW NOISE MODE

* Automatic switching

Operation in low noise mode
*Capacity -
Capacity is enough even
shortage
when switched to low noise
mode
Normal operation
* Automatic switching
Operation in low noise mode
*Capacity -
shortage
Operation in low noise mode
*Capacity -
shortage
Normal operation
»
Low noise mode setting
Capacity priority setting
(Push SW)
»
Fan upper limit speed
COOL
Upper limit compressor capacity
Fan upper limit speed
HEAT
Upper limit compressor capacity
Fan upper limit speed
COOL
Upper limit compressor capacity
Fan upper limit speed
HEAT
Upper limit compressor capacity
The operating sound lowers from about 3 to 5 dB more than the rated value
The operating sound lowers from about 3 to 5 dB more than the LOW NOISE MODE
Not switched for 30 minutes
after being once switched.
Not switched for 30 minutes
after being once switched.
Capacity is enough even
when switched to low noise
mode
Capacity is enough even
when switched to low noise
mode
Low noise level setting
(Push SW)
(Push SW)
OFF
ON
6 ton 8 ton
620rpm 620rpm
50rps
54rps
620rpm 620rpm
62rps
50rps
500rpm 500rpm
50rps
50rps
500rpm 500rpm
50rps 52rps
*
Capacity shortage condition
- When the compressor capacity is not enough
(Compressor operates with upper limit capacity for long time.)
- When condensing capacity is not enough in cooling / cooling main operation
(When the following condition keeps for 5 minutes,
All of HEX in use and FAN spped can not increase and High pressure satu-
ration temperature
- When evaporating capacity is not enough in heating / heating main operation
(When the following condition keeps for 5 minutes,
All of HEX in use and FAN spped can not increase and low pressure satu-
ration temperature
02-14
Operation mode
LEVEL 1
LOW NOISE MODE
LEVEL 2
LOW NOISE MODE
LEVEL 1
* Automatic switching
LEVEL 2
* Automatic switching
10 ton
620rpm
56rps
620rpm
56rps
500rpm
47rps
500rpm
53rps
136.4 F (517.65psi) / 58
32 F ( 0 C))
(3.57MPa))