Danfoss SM Series Instructions page 2

Instructions
SH / WSH 090 - 105 - 120 - 140 *- 161* -184*
SM 084 - 090 - 100 - 110 - 112 - 120 - 124 - 147 - 148 - 161
SZ 084 - 090 - 100 - 110 - 120 - 147 - 148 - 161
These Danfoss scroll compressors compressors are protected against
overheating and overloading by an internal safety motor protector.
However, an external manual reset overload protector is recommended
for protecting the circuit against over-current.
All models except SH/ SH140-3 & 161-3 & 184
WSH140-3 & 161-3 & 184 WSH140-3 & 161-3 & 184
SM 115 - 125 - 160 - 175 - 185
versions with thermostat
SZ 115 - 125 - 160 - 175 - 185
These Danfoss scroll compressors compressors are provided with a
bimetallic single pole single throw thermostat which is located in the
motor windings. Because the thermostat is an automatic reset device, it
must be wired in a lockout safety circuit with a manual reset to restart
the unit. For over-current protection, an external manual reset overload
protector must be used.
SH 180
SM 115 - 125 - 160 - 175 - 185
versions with electronic module
SZ 115 - 125 - 160 - 175 - 185
This Danfoss scroll compressors compressor motor is protected by an
external module protecting against overheating and high current draw.
SM 115 - 125 - 160 - 175 - 185
SH180
SZ 115 - 125 - 160 - 175 - 185
L1
N
1
2
12
14
11
2 FRCC.EI.003.A6.02 © Danfoss Commercial Compressors 01/14
CC
L1 L3 L2
Q1
F1 F1
KM
KA KS
KM KA KA
A1
LPS
T1 T2
A3
KS
180 s
HP
A2 T3
TH
LP
KS
M
DGT
KM KA LLSV KS
CC
L1 L3 L2
Q1
F1
F1
KM
KS
KM KA KA KA
F2
T1 T2
LPS
A1
A3
180s T3
HP
KS
A2
TH
LP
M
DGT
KS
1 2
KM KA LLSV KS
CC
A1
LPS
A3 MPM
A2
LP
S
Instructions
SH 240 - 295 - 300 - 380 -485
SY 240 - 300 - 380
SZ 240 - 300 - 380
These Danfoss scroll compressors compressors' motors are protected
by an external module protecting against phase loss/reversal, over-
heating and high current draw.
Legend:
Fuses ..........................................................................................F1 High pressure safety switch.................................................HP
Compressor contactor .........................................................KM Control device .........................................................................TH
Control relay ...........................................................................KA Liquid Line Solenoid valve ............................................... LLSV
Safety lock out relay .............................................................. KS Discharge gas thermostat ................................................DGT
Optional short cycle timer (3 min) ............................... 180 s Fused disconnect ...................................................................Q1
External overload protection ...............................................F2 Motor safety thermostat ................................................... thM
Pump-down pressure switch ...............................................LP Compressor motor ................................................................. M
1 – Introduction
4 – Assembly
These instructions pertain to the Danfoss scroll
compressors SM, SY, SZ, SH & WSH scroll com- • In parallel assemblies of SH, WSH, SM112 - 124
pressors used for air-conditioning systems. They - SM/SZ147 the compressor requires a rigid
provide necessary information regarding safety mounting on the rails. Use the rigid spacers
and proper usage of this product. from the tandem mounting kit or the rigid
spacers delivered with dedicated tandem
2 – Handling and storage
compressors.
• Handle the compressor with care. Use the • Slowly release the nitrogen holding charge
dedicated handles in the packaging. Use the through the schrader port.
compressor lifting lug and use appropriate • Remove the gaskets when brazing rotolock
and safe lifting equipment. connectors.
• Store and transport the compressor in an • Always use new gaskets for assembly.
upright position. • Connect the compressor to the system as
• Store the compressor between -35°C and 50°C. soon as possible to avoid oil contamination
• Don't expose the compressor and the packa- from ambient moisture.
ging to rain or corrosive atmosphere. • Avoid material entering into the system while
cutting tubes. Never drill holes where burrs
3 – Safety measures before assembly
cannot be removed.
Never use the compressor in a ammable • Braze with great care using state-of-the-art tech-
atmosphere. nique and vent piping with nitrogen gas ow.
• Connect the required safety and control de-
• The compressor ambient temperature may vices. When the schrader port is used for this,
not exceed 50°C during o -cycle. remove the internal valve.
• Mount the compressor on a horizontal at • Do not exceed the maximum tightening
surface with less than 3° slope. torque for rotolock connections:
• Verify that the power supply corresponds to Rotolock connections Tightening torque
1" rotolock
the compressor motor characteristics (see
1 1/4 " rotolock
nameplate).
1 3/4" rotolock
• When installing SZ or SH or WSH, use equip-
2 1/4" rotolock
ment speci cally reserved for HFC refrige-
5 – Leak detection
rants which was never used for CFC or HCFC
refrigerants. Never pressurize the circuit with oxygen or
• Use clean and dehydrated refrigeration-grade dry air. This could cause re or explosion.
copper tubes and silver alloy brazing material.
• Use clean and dehydrated system components. • SM 084 to 185, SY 380, SZ 084 to 185, SZ 380, SH
• The piping connected to the compressor must be 090 to 184, WSH 090 to 184: Pressurize the sys-
exible in 3 dimensions to dampen vibrations. tem on HP side rst and then on LP side. Never
FRCC.EI.003.A6.02 © Danfoss Commercial Compressors 01/14
CC
A1
LPS
A3
MPM
A2
KS
S
Motor Protection Module ............................................... MPM
Thermistor chain.......................................................................S
Safety pressure switch ........................................................ LPS
Control circuit ........................................................................CC
All Wiring diagrams are with pump-down cycle
let the pressure on LP side exceed the pressure
on HP side with more than 5 bar. Such pressure
di erence could cause internal compressor da-
mage.
• Do not use dye for leak detection.
• Perform a leak detection test on the complete
system.
• The test pressure must not exceed :
Models LP side HP side
SY / SZ 240 - 380 20 bar 32 bar
SM / SZ 84 - 185 25 bar 32 bar
SH 180 - 485 30 bar 45 bar
SH / WSH 090 - 184 33 bar 45 bar
• 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) absolute.
• Do not use a megohmmeter nor apply power
to the compressor while it is under vacuum as
this may cause internal damage.
80 Nm 7 – Electrical connections
90 Nm
• Switch o and isolate the main power supply.
110 Nm
See overleaf for wiring details.
130 Nm.
• All electrical components must be selected as per
local standards and compressor requirements.
• Refer to page 2 for electrical connections details.
• The Danfoss scroll compressors scroll com-
pressor only works correctly in one rotation
direction. Line phases L1, L2, L3 must abso-
lutely be connected to compressor terminals
T1, T2, T3 to avoid reverse rotation.
3