Emerson Copeland 2D User Manual

12 AGL_HA_ST_Discus_A2L_A1_EN_Rev00
3.2.2 Low-pressure protection
CAUTION
Operation outside the application envelope! Compressor breakdown! A
low-
pressure protection shall be fitted in the suction line to stop the
compressor when it operates outside the envelope limits. Do not bridge or by-
pass the low-pressure limiter.
CAUTION
Low suction pressure operation! Compressor damage! Do not operate
compressor with a restricted suction or with the low-pressure limiter bridged.
Do not operate compressor at pressures that are not allowed by the operating
envelope. Allowing the suction pressure to drop below the envelope limit for
more than a few seconds may overheat the pistons and cause damage to
parts.
Applicable regulations and standards shall be followed to apply appropriate control and ensure that
the pressure is always above the required minimum limit.
The low-pressure control must be installed correctly into the suction line, which means that no service
valve is allowed between the compressor and the pressure protection.
The minimum cut-out setting shall be determined according to the refrigerant and the allowed
operation envelope – see Select software at www.climate.emerson.com/en-gb
.
The low-pressure cut-out should have a manual reset feature for the highest level of system
protection.
3.2.3 Protection of A2L-refrigerant systems operating below atmospheric pressure
WARNING
Operation below atmospheric pressure! Fire hazard!
During operation
below atmospheric pressure, a flammable mixture can form inside the system.
Ensure system tightness to prevent any ingress of air.
CAUTION
Operation outside the application envelope! Compressor breakdown! A
low-pressure protection shall
be fitted in the suction line to stop the
compressor when it operates outside the envelope limits.
CAUTION
Low suction pressure operation! Compressor damage! Do not operate
compressor with a restricted suction or with the low-pressure limiter bridged.
Do not operate compressor at pressures that are not allowed by the operating
envelope. Allowing the suction pressure to drop below the envelope limit for
more than a few seconds may overheat the pistons and cause damage to
parts.
Special requirements for safety and tightness apply to 2D*, 3D* or 8D* compressor systems that are
to be operated below atmospheric pressure. The following precautions must be observed:
 Check all the critical points on the system and piping connections; tightness has to be ensured
also at very low pressure.
 Minimum absolute working pressure: 0.5 bar.
 The installation of mechanical high-pressure and low-pressure cut-outs is mandatory. For
systems provided with a service shut-off valve on the discharge side of the compressor, only
mechanical pressure cut-outs shall be used. Electronic pressure limiters, which could cause
delayed sensor response, are not allowed.
 The high- and low-pressure cut-outs must be installed correctly on the discharge and suction
lines, which means that no service valve is allowed between the compressor and the pressure
protection (refer to EN 378 or ISO 5149).
 A discharge temperature control is mandatory to stop the compressor when the maximum
discharge temperature is exceeded.
 Additional warning notices shall be affixed to any system equipped with shut-off valves. The
warnings must contain instructions to open the shut-off valves completely after each repair or

Emerson Copeland 2D Specifications

General

Brand	Emerson
Model	Copeland 2D
Category	Air Compressor
Language	English