JOHNSON CONTROLS
229
SECTION 7 - OPERATION
FORM 201.23-NM2
ISSUE DATE: 3/9/2015
7
SOUND LIMIT CONTROL
(Local and Remote Reset Control)
Sound Limiting and Local Sound Limit
Setpoint
Sound limit control to reduce overall chiller noise lev-
els at specified times of the day is accomplished by set-
ting a Sound Limit Setpoint. There are several ways to
set the Sound Limit Setpoint. The first is by changing
the Local Sound Limit Setpoint under the PROGRAM
key. This is the value the unit will use for sound limit-
ing, if neither of the other methods is active. If any
other sound limit methods are active, the lowest value
will be used. A sound limit of 0% will allow the unit to
run up to the unit’s maximum frequency. A sound limit
of 100% will not allow the unit to run above the mini-
mum frequency. All other sound limit values are linear
between these 2 points.
A sound limit schedule must be programmed under the
SCHEDULE key when sound limiting is utilized. The
schedule defines the time period that sound limiting
will be active.
Sound Limiting is only possible if the option is enabled
by both the OPTIONS key selection and the factory
programmable password protected Unit Setup Mode.
If Sound Limiting is disabled under the
Unit Setup Mode, nothing relating to
Sound Limiting will show up on any dis-
play screen or printout.
ISN Sound Limit Setpoint
The ISN Sound Limit Setpoint can be set via the ISN
II comms. The control panel will only accept a Sound
Limit Setpoint from the ISN if the control panel is in
Remote Control Mode. If the control panel is in Local
Control Mode, the ISN setpoint will be ignored. The
minimum and maximum allowable values will be the
same as the minimum and maximum allowable values
for the Sound Limit Setpoint under the PROGRAM
key. If these values are exceeded, the minimum or
maximum value will be used.
Contact a local Johnson Controls ISN Representative
for details on ISN controls and capabilities.
Remote Sound Limit
The Sound Limit Setpoint can be set via the Remote
Sound Limit analog input. A zero signal input (0% input)
equates to the minimum sound limit setpoint as defined
under the PROGRAM key Sound Limit Setpoint. A full
scale signal input (100% input) equates to the maximum
sound limit setpoint as defined under the PROGRAM
key Sound Limit Setpoint. The input is linear and may
be adjusted between 0% (minimum sound limiting) and
100% (maximum sound limiting) points.
This input may be used either in Local or Remote Con-
trol Mode. The input will be ignored if the Remote
Sound Limit is disabled under the OPTIONS key. Once
a change to the input is registered, a timer is set to the
value of the Remote Inputs Service Time as program-
mable under the Unit Setup Mode at the factory for the
default value of 15 minutes. The low limit is 5 minutes
and the high limit is 60 minutes. The Remote input will
be ignored until this timer expires. The timer assures
that rapid changes in a remote reset signal don’t result
in poor temperature control and excessive compressor
cycling. In most instances, this timer will not need to
be changed, since reset more often than 15 minutes
will create problems with chilled liquid temperature
control. Factory Service should be contacted if a timer
change is required.
Control board jumper JP6 must be positioned correctly
to receive either a voltage (0 to10VDC or 2 to 10VDC)
or current (0 to 20mA or 4 to 20mA) signal. Place the
jumper in the “V” position for a voltage signal or mA
for a current signal
(See Figure 27 on page 178 and
The software must be con-
figured under the OPTIONS key for the type of input
signal to be used.
The maximum sound limit is achieved at either 10VDC
or 20mA. Sending the minimum signal (0VDC, 2VDC,
0mA, or 4mA based on the OPTIONS key setting)
causes the sound limit to be set to its minimum (no
limiting) value.
0 through 10VDC Reset Input
A 0VDC signal produces a 0% sound limit (no change
to max VSD freq). A 10VDC signal produces a 100%
sound limit (max VSD freq equals min VSD freq). The
sound limit is ramped linearly between these limits as
the input varies between 0VDC and 10VDC. In or-
der for this input to work properly, the Remote Sound
Limit must be programmed for 0 through 10VDC input
(OPTIONS key) and Chiller Control Board jumper JP6
placed in the “V” position.
Summary of Contents for YCIV0157
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