FMS-1655M
LIT-12013119
8
Overview
The Johnson Controls FMS-1655M Room
Pressure Monitor is an ultra-sensitive
instrument used to monitor differential
pressure in hospital rooms, isolation
rooms, surgical suites, laboratories,
and clean rooms. This unit is capable of
measuring and displaying differential air
pressures as low as 0.0001” WC (0.0249
Pa).
Key features of the FMS-1655M Monitor
include:
• Full-color touchscreen display with
programmable display options and
adjustable backlight
• Safety Halo™ edge lighting
• Intuitive user interface that simplifies
setup and configuration of unit
• Graphical display that indicates room
status
• Audible and visual alarms
• Multi-level password protection
• Zero calibration feature allows in-field
recalibration of zero pressure reading
• 2 factory-calibrated analog outputs,
one for PID control and one for remote
monitoring room DP
• BACnet® BMS network comms port
The FMS-1655M Monitor is equipped
with a 3.2” full-color touchscreen display
in portrait orientation (240 pixels by 320
pixels). The password-protected menu
tree is intuitive and simplifies the setup
and configuration of the unit. The menus
incorporate touch-based interfaces such
as sliders, radio buttons, and dialog pop-
ups to facilitate the ease-of-use of the
FMS-1655M Monitor.
The display has a bright background
color that changes to indicate the three
different room statuses. The background
colors indicate
“Normal”
when pressure
is within defined limits,
“Warning”
when pressure is nearing an out-of-
limits condition, and
“Alarm”
when
pressure is outside defined acceptable
limits. The pressure ranges for these
conditions are easily set by the user for
the specific installation. The background
color changes provide an at-a-glance
conditions of the monitored room.
Alarm conditions may be defined by
the user, in terms of desired differential
pressure settings for the room being
monitored. When an alarm condition
occurs, it may be annunciated in three
user-definable ways:
1. On the display
2. With an audible alarm
3. Safety Halo™ edge lighting
4. Over the BMS network
The alarm will automatically reset when
the unit has sensed that the room
differential pressure has returned to
proper limits. The user may easily mute
the audible alarm by touching the
Alarm
Audible
button at the bottom of the
touchscreen display.
The FMS-1655M Monitor provides a
single digital input that may be used
for monitoring a door switch. The
configuration of the door switch input
is configured for normally-closed
operation, and is active-high triggered.
A SPDT magnetic door switch type is
recommended for use with function.
The user may set up multiple multi-level
passwords to prevent unauthorized
or casual access to the FMS-1655M
Monitor configuration settings. Up to
ten passwords of up to eight digits
may be programmed, with each having
one of four associated access levels.
Administrators and facility management
personnel may have unrestricted access,
while general staff may be assigned
restricted access passwords which limit
the functionality of the user menus.
Room pressure selection of
Positive
,
Negative
, or
Neutral Isolation
may
be protected using limited access
passwords, thereby eliminating the
need for keylock switches and keys. In
some locales, it is prohibitive to allow
an isolation room controller to switch
between positive and negative modes
of isolation. To accommodate this
situation, the FMS-1655M Monitor may
be configured at the factory for either
Positive- and Neutral-isolation modes only
or Negative- and Neutral-isolation modes
only.
The FMS-1655M Monitor isolation monitor
is powered by a supplied universal
120/240 VAC to 24 VAC isolation power
supply that is fused at the secondary with
a 1-amp slow blow fuse. This powers both
the touchscreen display along with the
connected differential pressure sensor
module.
A 10 ft. length of 4-conductor cable is
provided with the FMS-1655M Monitor to
interface the two modules. If the distance
between the display and remote sensor
modules exceeds 10 ft, then this cable
may be substituted with the required
length of 4 conductor, dual twisted pair,
shield cable (Belden part no. 1325A).
The FMS-1655M Monitor includes a
remotely mounted sensor for measuring
the differential pressure of the monitored
room or space. This remote sensor
must be installed in the wall between
the monitored isolation room and the
adjoining corridor or anteroom. The front
port (P1) must be oriented towards the
isolation room and the rear port (P2)
towards the corridor or anteroom. Please
see the illustration on pages 8-9 for more
details.
The FMS-1655M Monitor incorporates
a PID output signal that may be used to
control a damper actuator. The factory-
calibrated analog signal is available as a
voltage between 0-10VDC or 2-10VDC
at the remote sensor connector. Refer to
page 12 and 13 for more information.
