Quincy QSI-90, Instruction Manual

Page: 17 / 92

Section III - Installation
Relief Valves
Pressure relief valves are sized
to protect the system. Never
change the pressure setting or
tamper with the valve. Only
the relief valve manufacturer
or an approved representative
is qualifi ed to make such a
change.
DANGER!
Relief valves are to protect system
integrity in accordance with ANSI/
ASME B19 safety standards. Failure
to provide properly sized relief valves
could result in death or serious injury.
Electrical
Before installation, the electrical supply
should be checked for adequate wire size
and capacity. During installation, a suitable
fused disconnect switch or circuit breaker
should be provided. Any unreasonable
voltage unbalance (5%) between the legs
must be eliminated and any low voltage
corrected to prevent excessive current
draw. The installation, electric motor,
wiring and all electrical controls must
be in accordance with National Electric
Code, and all state and local codes. A
qualifi ed electrician should perform all
electrical work.
Air compressors must be
grounded in accordance with applicable
codes.
See control panel for the proper
wiring diagram.
Quincy would like to emphasize the
importance of providing adequate
grounding for air compressors. The
common practice of grounding units to
building structural steel may not actually
provide adequate grounding protection, as
paint and corrosion buildup may exist.
CAUTION!
NEMA electrical enclosures and
components must be appropriate to
the area in which they are installed.
Relief valves are to be placed ahead of
any potential blockage point that includes,
but is not limited to, such components
as shutoff valves, heat exchangers and
discharge silencers. Ideally, the relief
valve should be threaded directly into the
pressure point it is sensing, not connected
with tubing or pipe and pointed away from
any personnel. Always direct discharge
from relief valves to a safe area away from
personnel.
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