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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. A cable
tie should be fitted within 20mm of the cable gland inside the enclosure. The
connectors will accept wire of 0.5-1.5mm sq.
Note: Earth connection must be made when using the vented metal enclosure or Exd
enclosure. The safety of this equipment is dependent on the integrity of the power
supply and the earthing of the enclosure.
On power up the sensor may take some time (minutes up to hours) to fully normalize.
You can monitor this by checking the 0-10V output as it falls towards zero. If during
this normalisation period the red / yellow LED activates indicating the high / low level
relay has switched then the reset button (see Fig. 1.) on the sensor must be pushed
(if in latched position) after normalisation is complete.
Figure 1. External Connections
3 EN1B-0014UK07 R0404