Danfoss H Series Instructions For Use page 2

Instructions
• Use clean and dehydrated system components.
• The piping connected to the compressor must be
flexible in 3 dimensions to dampen vibrations.
• The compressor must always be mounted with the
rubber grommets supplied with the compressor.
4 – Assembly
• Slowly release the nitrogen holding charge
through discharge and suction ports.
• Connect the compressor to the system as soon as possi-
ble to avoid oil contamination from ambient moisture.
• Avoid material entering into the system while cutting
tubes. Never drill holes where burrs cannot be removed.
• Braze with great care using state-of-the-art techni-
que and vent piping with nitrogen gas flow.
• Connect the required safety and control devices.
When the schrader port, if any, is used for this, re-
move the internal valve.
• For parallel assemblies of the compressors in ver-
sion C8, contact Danfoss.
5 – Leak detection
Never pressurize the circuit with oxygen or dry
air. This could cause fire or explosion.
• Do not use leak detection dye.
• Perform a leak detection test on the complete system.
• The low side test pressure must not exceed 31 bar
/450 psi.
• When a leak is discovered, repair the leak and re-
peat the leak detection.
6 – Vacuum dehydration
• Never use the compressor to evacuate the system.
• Connect a vacuum pump to both the LP & HP sides.
• Pull down the system under a vacuum of
500 µm Hg (0.67 mbar) / 0.02 inch Hg absolute.
• Do not use a megohmmeter nor apply power to
the compressor while it is under vacuum as this
may cause internal damage.
7 – Electrical connections
• Switch off and isolate the main power supply.
• All electrical components must be selected as per local
standards and compressor requirements.
• Refer to page 1 for electrical connections details.For
three phase applications, the terminals are labeled T1,
T2, and T3. For single-phase applications the terminals
are labeled C (common), S (start), and R (run).
• Danfoss scroll compressors will only compress gas
while rotating counter-clockwise (when viewed from
the compressor top). Since single-phase motors will
start and run in only one direction, reverse rotation is
not a major consideration. Three-phase motors, howe-
ver, will start and run in either direction, depending on
the phase angles of the supplied power. Care must be
taken during installation to ensure that the compres-
sor operates in the correct direction.
• Use ø 4.8 mm / #10 - 32 screws and ¼" ring terminals
for the power connection with ring connect screw ter-
minal (C type). Fasten with 3 Nm torque.
• Use ø 6.3 mm tabs for quick connect spade termi-
nals (P type).
• Use a self tapping screw to connect the compres-
sor to earth.
8 – Filling the system
• Keep the compressor switched off.
• Keep the refrigerant charge below the indicated
charge limits if possible. Above this limit; protect
the compressor against liquid flood-back with a
pump-down cycle or suction line accumulator.
• Never leave the filling cylinder connected to the circuit.
Compressor models
HRM032-034-038-040-042-045-047
HRP034-038-040-042-045-047
HHP015-019-021-026
HRH031-032-034-036-038-040
HRM048-051-054-058-060 /
HLM068-072-075-078-081
HRP048-051-054-058-060 /
HLP068-072-075-081
HHP030-038-045
HRH044-049-051-054-056 /
HLH061-068 - HLJ072-083
HCM094-109-120
HCP094-109-120
HCJ090-105-120
9 – Verification before commissioning
Use safety devices such as safety pressure
switch and mechanical relief valve in compliance
with both generally and locally applicable regu-
lations and safety standards. Ensure that they are
operational and properly set.
Check that the settings of high-pressure swit-
ches don't exceed the maximum service pressure
of any system component.
• A low-pressure switch is recommended to avoid
low pressure operation.
Minimum setting for R22
1.5 bar (absolute) / 22 psia
Minimum setting for R407C
Minimum setting for R410A 2.5 bar (absolute) / 36 psia
• Verify that all electrical connections are properly faste-
ned and in compliance with local regulations.
• When a crankcase heater is required, it must be
energized at least 24 hours before initial start-up
and start-up after prolonged shutdown.
10 – Start-up
• Never start the compressor when no refrigerant is
charged.
• Do not provide any power to the compresor
unless suction and discharge service valves are
open, if installed.
• Energize the compressor. It must start promptly.
If the compressor does not start, check wiring
conformity and voltage on terminals.
• Eventual reverse rotation can be detected by following
phenomena; the excessive noise, no pressure differen-
tial between suction and discharge, and line warming
rather than immediate cooling. A service technician
should be present at initial start-up to verify that sup-
ply power is properly phased and that the compressor
is rotating in the correct direction. H-series Scroll com-
pressors are designed to operate for a maximum of
150 hours in reverse, but as a reverse rotation situation
can go unnoticed for longer periods, phase monitors
are recommended. For compressors HLM078, HLP081,
HLJ083 and larger, phase monitors are required for all
applications. Danfoss recommends phase protection
for residential compressors.
• If the internal overload protector trips out, it must cool
down to 60°C / 140°F to reset. Depending on ambient
temperature, this may take up to several hours.
11 – Check with running compressor
Check current draw and voltage. Measurement
of amps and volts during running conditions must
be taken at other points in the power supply, not in
the compressor electrical box.
• Check suction superheat to reduce risk of slugging.
FRCC.PI.006.A2.22 © Danfoss Commercial Compressors 04/10
• Observe the oil level in the sight glass (if provi-
ded) for about 60 minutes to ensure proper oil
return to the compressor.
Refrigerant
• Respect the operating limits.
charge limit
• Check all tubes for abnormal vibration. Move-
ments in excess of 1.5 mm / 0.06 in require cor-
3.6 kg / 8 lb
rective measures such as tube brackets.
• When needed, additional refrigerant in liquid phase
may be added in the low-pressure side as far as pos-
sible from the compressor. The compressor must be
5.4 kg / 12 lb
operating during this process.
• Do not overcharge the system.
• Never release refrigerant to atmosphere.
• Before leaving the installation site, carry out a
general installation inspection regarding cleanli-
7.2 kg / 16 lb
ness, noise and leak detection.
• Record type and amount of refrigerant charge as
well as operating conditions as a reference for fu-
ture inspections.
12 – Maintenance
Internal pressure and surface temperature are
dangerous and may cause permanent injury. Main-
tenance operators and installers require appropria-
te skills and tools. Tubing temperature may exceed
100°C / 212°F and can cause severe burns.
Ensure that periodic service inspections to en-
sure system reliability and as required by local re-
gulations are performed.
To prevent system related compressor problems, fol-
lowing periodic maintenance is recommended:
• Verify that safety devices are operational and pro-
perly set.
• Ensure that the system is leak tight.
• Check the compressor current draw.
• Confirm that the system is operating in a way
consistent with previous maintenance records
and ambient conditions.
• Check that all electrical connections are still ade-
quately fastened.
• Keep the compressor clean and verify the absen-
ce of rust and oxidation on the compressor shell,
tubes and electrical connections.
• Acid / moisture content in system and oil should
be checked regularly.
13 - Warranty
Always transmit the model number and serial number
with any claim filed regarding this product.
The product warranty may be void in following cases:
• Absence of nameplate.
• External modifications; in particular, drilling, wel-
ding, broken feet and shock marks.
• Compressor opened or returned unsealed.
• Rust, water or leak detection dye inside the com-
pressor.
• Use of a refrigerant or lubricant not approved by
Danfoss.
• Any deviation from recommended instructions per-
taining to installation, application or maintenance.
• Use in mobile applications.
• Use in explosive atmospheric environment.
• No model number or serial number transmitted
with the warranty claim.
14 – Disposal
Danfoss recommends that compressors
and compressor oil should be recycled by
a suitable company at its site.
H series
2