Dwyer RSM - Manual (Page 2)

1.2 RSM FUNCTION
The Series RSM senses very low differential pressure using high accuracy
capacitive sensor technology. The pressure difference for these
applications is the difference in static pressure between a critical
environment room and its surrounding reference area (usually a hallway or
another room). Maintaining and monitoring a static room pressure
difference ensures that the critical environment room is either protected or
isolated from a surrounding environment. Protection strategy requires a net
positive room static pressure difference, while isolation requires a net
negative static pressure difference. The RSM can be programmed to
monitor either positive or negative room static pressure. The RSM low
pressure sensing technology is coupled with multifunctional alarming and
simple touch-screen user interface with password security protection. The
BACnet communication option allows the device to communicate with
other BACnet devices to allow the supervisory system to change
configuration setups and monitor alarms in an open network.
User Interface: LCD display 128 x 128 COG module, with custom RGB
LED backlight and custom 4-wire resistive touch screen.
RGB Backlight: The SRPM indicates the status of the room being
monitored using visual backlight color.
Color status:
Green — Room pressure is within alarm limits.
Yellow — Door is open (door input must be enabled).
Red — Room pressure is outside alarm limits and alarm delay period has
been exceeded.
Visual Feedback: LEDs, green for normal, red for alarm.
Audible Feedback: Buzzer will sound when pressure is out of range and
alarm delay has timed out. Volume can be adjusted between 1 to 4 in
relative sound levels up to the max level spec of the buzzer of 85 dB at 4˝.
Audible alarm can also be disabled.
Quick Room Mode Change: Sometimes the room needs to be changed
quickly from in use (Occupied) to out of use (No Isolation). This is
accomplished by using two levels of password protection. The Operator
level allows access to change room modes but no other changes. The
Supervisor Level allows full access to all menus. In No Isolation mode no
alarms are generated even if the pressure is outside limits. To change
modes press the Menu key, press Setup Room key and press No Isolation.
2.0 PARTS LIST
2.1 RSM INCLUDED PARTS
Quantity
1
RSM assembly
2 Barbed Coupling, Brass
2 1/4˝ Tube, Silicone, Inter-Connect
4 6-32 x 1/2” Mounting Screws for RSM Base
2.2 OPTIONAL A-285 INCLUDED PARTS
Quantity
1
Annunciator Assembly
3.0 MOUNTING AND WIRING
To mount and install properly, the following components are required:
3.1 NOT INCLUDED RSM PARTS
Quantity
1
Double Gang Metal Electrical Box with Grounding Stud
1 4˝ x 4˝ Metal Plaster Ring
1 Door Switch SPDT or SPST, N.O., as needed
3.2 NOT INCLUDED A-285 PARTS
Quantity
1
Single Gang Electrical Box
Note: In the following wiring sections, abbreviations are used (e.g. J1, P3).
Please see section 13.0 for complete wiring diagrams with abbreviations.
3.3 MOUNTING
(For 120/240 VAC Version Only): Do not open or remove RSM cover
(flathead screwdriver required) with input power applied unless performed
by a licensed electrician. “Hazardous Live” voltage is present at connector
J3 when power is applied. Please observe the warning symbol ( ) near
the J3 power connector.
The RSM is designed to be mounted on a standard double gang metal
electrical box using a 4˝ x 4˝ plaster ring adaptor. Remove the RSM cover
and mount the baseplate to the plaster ring adaptor using four 6-32, 1/2˝
long mounting screws. Note: The plaster ring external mounting face needs
to be positioned flush to recessed, relative to the surface of the wall. Also
note the orientation of the 4 mounting screws in the plaster ring, as the
plaster ring is rotated 90° from conventional mounting.
3.4 WIRING ELECTRICAL BOX (ROUGH IN)
Layout the system in terms of wiring: power, annunciator, analog output,
BACnet, relay output and plumbing to connect to the monitored spaces
(pressure taps). Bring all power, earth ground, signal communications and
analog output wiring into the 4˝ x 4˝ electrical box. In order to conform to
the CSA safety standard the electrical installer must comply with the
following ground earth instructions. Pre-wire electrical box with power (24
VAC or 120/240 VAC depending on RSM model), and provide grounding to
the electrical box and plaster ring adaptor. The safety ground path consists
of the four 6-32 x 1/2˝ metal screws that connect the RSM metal base to
the 4˝ x 4˝ metal plaster ring. The plaster ring is grounded to the 4˝ x 4˝
electrical box by 2 mounting screws. The 4˝ x 4˝ electrical box is grounded
to the building earth ground. It is also highly recommended to use armored
cable (Type AC) for all the wiring in applications where high levels of radio
interference may be present.
Power leads and wiring should be 14 to 22 AWG braided wire. 18 AWG
braided wire is recommended for wiring J3 power connector to RSM. For
120/240 VAC the hot wire connects to L and neutral to N (See Section
13.0). BACnet suggested wiring is 22 AWG stranded wire in a shielded
cable, a +, -, Gnd (S) and shield should be run. This can be two twisted
pairs with a separate cable shield. One twisted pair is used for
communications, the second twisted pair can be used for communications
ground and the shield wire can be connected to the other device shield
wires.
Mounting Screws [x 4]
CAUTION
P-3-RSM:TEMPLATE 2/17/11 2:22 PM Page 2