Honeywell HA71 Technical Manual page 2

HA71 Digital Gas Controller
Important Safety Issues
The following symbols are used in this manual to alert the user of
important instrument operating issues:
This symbol is intended to alert the user to hazards or
unsafe practices which could result in severe personal
injury or death.
This symbol is intended to alert the user to the presence
of important operating and maintenance (servicing)
instructions.
This symbol is intended to alert the user to the presence
of dangerous voltage within the instrument enclosure that
may be sufficient magnitude to constitute a risk of electric
shock.
WARNINGS:
• Shock Hazard - Disconnect or turn off power before servicing
this instrument.
• NEMA 4X wall mount models should be fitted with a locking
mechanism after installation to prevent access to high voltages
by unauthorized personnel (see Figure 6-2).
• Only the combustible monitor portions of this instrument
have been assessed by CSA for C22.2 No. 152 performance
requirements.
• This equipment is suitable for use in Class I, Division 2, Groups
A,B,C and D or non-hazardous locations only.
• Use a properly rated CERTIFIED AC power (mains) cable installed
as per local or national codes
• A certified AC power (mains) disconnect or circuit breaker should
be mounted near the controller and installed following applicable
HA71 Technical Manual
local and national codes. If a switch is used instead of a circuit
breaker, a properly rate CERTIFIED fuse or current limiter is
required to installed as per local or national codes. Markings
for positions of the switch or breaker should state (I) for on and
(O) for off.
• Clean only with a damp cloth without solvents.
• Equipment not used as prescribed within this manual may impair
overall safety.
WARNING
Explosion hazard- substitution of components may impair suitability
for Class I, Division 2.
WARNING
Explosion hazard- do not replace fuse unless power has been switched
off or the area is known to be non-hazardous.
WARNING
Explosion hazard- do not disconnect equipment unless power has
been switched off or the area is known to be non-hazardous.
Modbus ® is a Registered Trademark of Schneider Electric
i Revision 3 (04/08)