Dwyer RSM User Manual download pdf (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

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Dwyer RSM User Manual Page 2

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