Instructions
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on
order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
FRCC.PI.015.A2.22 - February 2014
Copyright Danfoss Commercial Compressors - DSS - 02/14
• Connect the compressor to the system as soon as
possible 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
technique and vent piping with nitrogen gas flow.
• Connect the required safety and control devices.
When the schrader port, if any, is used for this,
remove the internal valve.
• For parallel assemblies of the compressors in
version 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
repeat 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, however,
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 compressor 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 terminal (C type). Fasten with 3 Nm torque.
• Use ø 6.3 mm tabs for quick connect spade
terminals (P type).
• Use a self tapping screw to connect the
compressor 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
refrigerant
charge limit
hRM032-034-038-040-042-045-047
3.6 kg / 8 lb
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
5.4 kg / 12 lb
hRP048-051-054-058-060 /
hLP068-072-075-081
hhP030-038-045
hRh044-049-051-054-056 /
hLh061-068 - hLJ072-083
hCM094-109-120
7.2 kg / 16 lb
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
regulations and safety standards. Ensure that they
are operational and properly set.
Check that the settings of high-pressure
switches 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
fastened 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.
• Please respect a 90 Nm ± 20 Nm for tightening
torque of all rotolock nut.
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 differential between suction and discharge,
and line warming rather than immediate cooling. A
service technician should be present at initial start-
up to verify that supply power is properly phased
and that the compressor is rotating in the correct
direction. h-series Scroll compressors 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.
• Observe the oil level in the sight glass (if
provided) for about 60 minutes to ensure proper
oil return to the compressor.
• Respect the operating limits.
• Check all tubes for abnormal vibration.
Movements in excess of 1.5 mm / 0.06 in require
corrective measures such as tube brackets.
• When needed, additional refrigerant in liquid phase
may be added in the low-pressure side as far as
possible from the compressor. The compressor must
be 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
cleanliness, noise and leak detection.
• Record type and amount of refrigerant charge
as well as operating conditions as a reference for
future inspections.
12 – Maintenance
Internal pressure and surface temperature
are dangerous and may cause permanent injury.
Maintenance operators and installers require
appropriate skills and tools. Tubing temperature
may exceed 100°C / 212°F and can cause severe
burns.
Ensure that periodic service inspections to
ensure system reliability and as required by local
regulations are performed.
To prevent system related compressor problems,
following periodic maintenance is recommended:
• Verify that safety devices are operational and
properly 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
adequately fastened.
• Keep the compressor clean and verify the
absence 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,
welding, broken feet and shock marks.
• Compressor opened or returned unsealed.
• Rust, water or leak detection dye inside the
compressor.
• Use of a refrigerant or lubricant not approved by
Danfoss.
• Any deviation from recommended instructions
pertaining 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
