SN0500 / SN0501 REFRIGERANT GAS LEAK DETECTOR INSTALLATION / USER GUIDE Copyright © 2004 Honeywell Control Systems Ltd.
GAS LEAK DETECTOR INSTALLATION & USER GUIDE CONTENTS 1. INTRODUCTION .................................................................................................... 3 2. EXTERNAL CONNECTIONS ................................................................................. 3 3. POWER SUPPLY................................................................................................... 4 4. ANALOGUE OUTPUTS ......................................................................................... 4 5.
GAS LEAK DETECTOR INSTALLATION & USER GUIDE 1. INTRODUCTION The Honeywell Refrigerant Gas Detection sensors, SN0500 (for refrigerant R404a) and SN0501 (for refrigerant R410) are used to detect the leakage of refrigerant gas and notify a monitoring system or provide a local indication (i.e. audible or visual signal). Remedial action can then be taken to stop and replace the lost gas. 2. EXTERNAL CONNECTIONS All external connections are made to the motherboard through a cable gland.
GAS LEAK DETECTOR INSTALLATION & USER GUIDE 3. POWER SUPPLY The Power supply is connected at Con 1 (see Fig. 1) Green LED on - shows power connected. Pin 1 = 0V, Pin 2 = 12 to 24 VAC or 12 to 30VDC, Pin 3 = Earth. The 0V (pin 1) on the power supply terminal block (CON 1) can withstand 50V AC or DC with respect to the 0V (Pin 1) on the output terminal block (CON 3). If this is likely to be exceeded use an isolated power supply. On the power supply side 12V is the minimum voltage at the terminals.
GAS LEAK DETECTOR INSTALLATION & USER GUIDE 5. RELAY CONTACTS Note: If changing any jumper - power must be removed. There are two relays rated up to 1 Amp at 24V DC/AC. The status of the relays is jumper selectable. Relay 1 at Con 6. Low-level alarm. Yellow LED on when in alarm. Normally closed when JP4 link inserted, JP3 link removed, as shown on Fig. 1. Normally open when JP3 link inserted, JP4 link removed, as shown on Fig. 1.
GAS LEAK DETECTOR INSTALLATION & USER GUIDE 7. STANDARD DEFAULT SETTINGS Relay 1 Relay 2 Low-level relay set at 500 PPM, NO, Auto reset mode High-level relay set at 900 PPM, NO, Auto reset mode. Delays on both alarm outputs are 0 minutes (no delay). CON 1: Power Supply input Power on indicated by Green LED. Supply voltages to be either 12V to 24V AC or 12 to 30V DC Power consumption is 4W max at 12V. The connectors will accept wire of 0.5-1.5mm² Refer to Section 3 for maximum cable run. CON 2: Not Used.
GAS LEAK DETECTOR INSTALLATION & USER GUIDE 8. CONNECTIONS AT A GLANCE Connector CON1 CON1 CON1 Pin 1 2 3 Description 0V Supply Voltage. 24V Supply Voltage. Earth. CON2 CON2 CON2 CON2 CON2 CON2 CON2 CON2 CON2 CON2 1 2 3 4 5 6 7 8 9 10 Display Connection – not used. Display Connection – not used. Display Connection – not used. Display Connection – not used. Display Connection – not used. Display Connection – not used. Display Connection – not used. Display Connection – not used.
Automation & Control Solutions Refrigeration Control Newhouse Industrial Estate Motherwell Lanarkshire ML1 5SB Phone: (44) 01698 481698 Fax: (44) 01698 481699 www.honeywell.com/refrigeration Subject to change without notice.
