POTTER RHA Rate Of Rise Fixed Temperature Heat Detector Owner’s Manual
- June 9, 2024
- POTTER
Table of Contents
POTTER RHA Rate Of Rise Fixed Temperature Heat Detector Owner’s Manual
Features
- Adjustable fixed 135° to 174° Fahrenheit
- Rate of rise feature with 10-12°F per minute detection
- LEDs for 360° viewing
- Low profile
- Reliable detection technology
Description
The combination Rate of Rise/Fixed Temperature Heat Sensor (RHA) is a listed
Analog/Addressable combination temperature heat sensor compatible with any
fire alarm control panel that has the Potter/ Nohmi protocol.
The heat sensing portion utilizes a proven thermistor for accurate and
reliable heat detection.
The sensor and base (not included) are made of a durable plastic in an
eggshell white (off white) to blend in with the ceiling.
The RHA is UL and cUL listed with a selectable fixed temperature point from
135° to 174° and a rate of rise feature.
The rate-of-rise operates when the temperature increases 12-15°F occurs.
The heat sensor is ideal for installations needing the earlier heat detection.
The RHA has two LEDs that allow for 360° viewing.
The sensor is compatible with any of the Potter/Nohmi bases and simply twists
on.
The RHA is addressed using the hand held programmer or the control panel
addressing function.
Spacing
The RHA spacing is dependent on the alarm set-point.
The unit is listed from 135°F to 174°F. However as the temperature setting
increases, the spacing decreases.
| Alarm set-point | RHA Spacing |
|---|---|
| 135 to 170 °F (57 to 76 °C) | Max. 50 ft |
| 171 to 174 °F (77 to 79 °C) | Max. 15 ft |
The system has a maximum of 13 LEDs that can be turned on simultaneously.
If the system already has 13 LEDs on, the RHA will operate even though the LED
will not illuminate.
Setting the Address
Each addressable module, smoke sensor, heat detector and combination
sensor/detector must have the address set before connecting the device to the
SLC loop.
The address is set using the hand held device programmer or the addressing
feature on the control Setting the Address Each addressable module, smoke
sensor, heat detector and combination sensor/detector must have the address
set before connecting the device to the SLC loop.
The address is set using the hand held device programmer or the addressing
feature on the control panel.
Before connecting a device to the SLC loop, take the following precautions to
prevent potential damage to SLC or device.
Verify the following:
- Power to the device is removed
- Field wiring is correctly installed.
- Field wiring has no open or short circuits.
Document discrepancies and notify appropriate personnel.
Specifications
| Item | FHA |
|---|---|
| Working voltage range | 22.0 to 24.0 V |
| Standby current | 325 µA |
| Alarm indicator | 2 LEDs |
| Alarm indicator current | 1.2 mA D.C. |
| Alarm set-point range | 135 to 174 °F/ 57 to 79 °C |
| Rate-of-rise | 12 to 15°F |
| Installation temperature range | 32 to 100 °F / 0 to 38 °C |
| Operating relative humidity range | 0% to 93% (Non-condensing) |
| Start-up time | Max. 1 sec. |
| Maximum number of addresses per loop | 127 |
| Maximum number of lighted indicators in alarm per zone. | 13 |
| Color | Eggshell White |
| Weight (without base) | 73g (2.57oz) |
| Dimensions (without base) | Height: 1.50 in (38mm) |
Diameter: 4.0 inches (99mm)
Approvals / Listings| UL, ULC, CSFM, MEA
Operation
The RHA is an analog/addressable sensor that uses one address on the Signaling
Line Circuit (SLC) of a compatible fire alarm control panel.
The unit communicates with the control panel as it is polled.
The LEDs flash every time the unit is polled and they will latch steady if the
unit is in an active status.
The RHA is a single sensor that may be used in a wide variety of applications
for property protection.
The RHA has a the rate of rise heat detection to provide detection of an
escalating fire.
The unit has a sleek design and low profile for pleasing aesthetics.
The temperature sensor is protected within the mold of the unit to prevent
accidental damage.
Compatible Bases
All bases will mount on a single gang, double gang, octagon, 4” square or mud ring electrical box.
| Device | Description |
|---|---|
| AB-4 | 4” Standard Base |
| AB-6 | 6” Standard Base |
| AIB | 6” base with an isolator module included. |
The base is pre-wired with a pluggable jumper to the module.
ARB| 6” base with a dual relay module included. One relay is rated for 8 amps
at 240 VAC/30 VDC and the second is rated for 2 amps at 240 VAC/30 VDC. The
base is pre-wired with a pluggable jumper to the module.
ASB| 6″ base with sounder module included. Sound pattern is provided from
external source.
The base is pre-wired with a pluggable jumper into the module.
CUSTOMER SUPPORT
Potter Electric Signal Company, LLC
St. Louis, MO
Cust Service: 866-240-1870
Tech Support: 866-956-1211
Canada: 888-882-1833
Web: www.pottersignal.com
References
- Fire Alarm Resources | Download fire alarm documents
- Potter Electric: Fire Alarms & Fire Sprinkler Systems
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