Sabroe Mounting of new type of capacity rod on SAB 83, 85, 87, 89 screw compressors Installation guide

Brand
Sabroe
Model
Mounting of new type of capacity rod on SAB 83, 85, 87, 89 screw compressors
Type
Installation guide
0171--977 1
Mounting Instruction
A newsletter from YORK Refrigeration, Technology & Products
Christian X’s Vej 201, P O Box 1810, DK-8270 Højbjerg, Denmark
Phone +45 87 36 70 00, Fax +45 87 36 77 05
4 Dec 2001
Subject: Mounting of New Type of Capacity Rod on
SAB 83, 85, 87 and 89 Screw Compressors
As described in Technical Information 2001/03, a new capacity measuring system for SAB 83,
85, 87 and 89 screw compressors was introduced in May/June 2001.
The electronic control system used so far can still be used for the new system, but the capacity
rod (capacity transmitter) must be replaced. The capacity rod can be replaced by following a
straightforward mounting procedure, which is described in this Mounting Instruction. This in-
struction also describes how the capacity measuring system is adjusted to the new sensor.
A kit is used for mounting the new capacity rod. This kit consists of the parts mentioned below
(see fig. 1).
Fig. 1
200/203 143 208 241
281
167
280
45
232
42
283
280a
282 40
f
44a
39
0171--977
2
Compressor SAB 83
Quantity Pos no Part no
Complete Kit 3084-638
consists of:
Capacity rod with threaded
bushing pos. 280a 1 280 1553-274
Cover 1 45 3013-299
Bushing for capacity transmitter 1 281 3043-251
Dowty ring 1 167 1331-433
Retainer with aluminium pipe 1 282/44a/42 3045-072
Hexagon socket screw M6X35 2 283 1413-344
O-ring ID 104.5x3 1 208 1331-355
O-ring ID 79.5x3 1 200 1331-353
Mounting Instruction 0171-977
Compressor SAB 85
Quantity Pos no Part no
Complete Kit 3084-639
consists of:
Capacity rod with threaded
bushing pos. 280a 1 280 1553-275
Cover 1 45 3013-264
Bushing for capacity transmitter 1 281 3043-251
Dowty ring 1 167 1331-433
Retainer with aluminium pipe 1 282/44a/42 3045-072
Hexagon socket screw M6X35 2 283 1413-344
O-ring ID 104.5x3 1 208 1331-364
O-ring ID 79.5x3 1 200 1331-353
Mounting Instruction 0171-977
0171--977 3
Compressor SAB 87
Quantity Pos no Part no
Complete Kit 3084-640
consists of:
Capacity rod with threaded
bushing pos. 280a 1 280 1553-276
Cover 1 45 3013-244
Bushing for capacity transmitter 1 281 3043-251
Dowty ring 1 167 1331-433
Retainer with aluminium pipe 1 282/44a/42 3045-074
Retainer for regulating piston 1 42 3013-365
Stop screws M6X6 2 44a 1413-229
Hexagon socket screw M6X35 2 283 1413-344
O-ring ID 104.5x3 1 208 1331-360
O-ring ID 109.5x3 1 203 1331-354
Mounting Instruction 0171-977
Compressor SAB 89
Quantity Pos no Part no
Complete Kit 3084-641
consists of:
Capacity rod with threaded
bushing pos. 280a 1 280 1553-277
Cover 1 45 3013-278
Bushing for capacity transmitter 1 281 3043-251
Dowty ring 1 167 1331-433
Retainer with aluminium pipe 1 282/44a/42 3045-075
Hexagon socket screw M6X35 2 283 1413-344
O-ring ID 104.5x3 1 208 1331-368
O-ring ID 109.5x3 1 203 1331-354
Mounting Instruction 0171-977
Dismounting
When the pressure in the compressor has been reduced to atmospheric pressure and the com-
pressor has been secured against unintentional start-up as described in the instruction
manual, proceed as follows (see sectional views in the instruction manual):
SDismount electric plug on existing capacity rod.
0171--977
4
SDismount existing capacity rod pos. 280 with open-end spanner (JW 24) and pull it out
of compressor carefully. Both capacity rod and gasket pos. 167 are not going to be re-
used.
SDismount hexagon socket screws pos. 241 (Allen key, JW 10) and push out cover pos.
45 by mounting screws pos. 241 in the two treaded holes in flange. Cover pos. 45 and
O-ring pos. 208 are not going to be reused.
Important!
For compressors without economizer, check that there is no excess pressure in capacity slide
chamber pos. 40. This is carried out as follows:
SIf one of the two threaded holes in retainer for regulating piston pos. 42 is marked with
an”X”,therewillbea2mmholeinbottomofthreadedholetoequalizepressurein
chamber, and disassembly may thus proceed as described below.
SIf retainer for regulating piston pos. 42 is not marked with an ”X”, a 2 mm hole must be
bored in retainer. This must be carried out before dismounting Seeger ring pos.143 and
two hexagon socket screws pos. 232 as excess pressure in chamber may project re-
tainer with great force.
Bore equalization hole as shown in drawing fig. 1. Mark the side turning outwards with an “X”,
which will facilitate subsequent compressor service.
Equalization hole must not be blanked off, but remain open for permanent pressure
equalization.
Fig. 1
dia. 2 mm
42
X
X
SAfter having checked that there is no excess pressure in capacity slide chamber, dis-
mount Seeger ring pos. 143 and two hexagon socket screws pos. 232 (Allen key, JW 8).
SBy mounting two hexagon socket screws pos. 232 in threaded holes, retainer for regulat-
ing piston pos. 42 can be pulled out. Both retainer for regulating piston and O-ring pos.
200 are not going to be reused.
0171--977 5
Mounting
When the parts to be mounted have been cleaned and suitably oiled, proceed as follows:
SPlace retainer for regulating piston pos. 42 on aluminium pipe pos. 282 with distance A
as illustrated in fig. 2. Tighten two stop screws pos. 44a (Allen key, JW 2.5).
A
B
282 42
44a
AB
S83
S85
S87
S89
320
359
399
439
23
8
8
8
Fig. 2
SWhen O-ring pos. 200 has been mounted, place arrangement with retainer for regulating
piston pos. 42 in regulating piston pos. 39/40 as illustrated in fig. 1.
Lock arrangement with Seeger ring pos. 143.
Mount and tighten two hexagon socket screws pos. 232.
SWhen O-ring pos. 208 has been mounted on cover pos. 45, mount cover on compressor
as shown in fig. 1.
SMount and tighten screws pos. 241 (Allen key, JW 10).
SMount Dowty ring pos. 167 and tighten threaded bushing pos. 280a.
SBy pressing bushing pos. 281 against cover pos. 45 (remember to turn bushing as il-
lustratedindrawing),place capacity rod pos. 280 in its position.
Mount and tighten screws pos. 283.
The same electric plug can be used for the new capacity rod as for the previous rod. It is, how-
ever, recommended to check that the wiring connections comply with fig. 3.
0171--977
6
1 = OUT 4--20mA
2 = SUPPLY +24V DC
3 = COMMON --
=GND
Fig. 3
Term in al 3 1
Term in al 2 9
Term in al 3 0
UNISAB II
Nottobeused
Adjusting capacity measuring system
As shown in fig. 4 the capacity transmitter is equipped with a single calibration button sur-
rounded by a green and red LED.
Fig. 4
During normal operation the red LED is flashing at a rather slow rate. The green LED is con-
stantly on when the transmitter is in 100% position, and it flashes quickly when the transmitter
is in 0% position.
Calibration is carried out as follows:
0171--977 7
Note! Make sure that UNISAB II is not in alarm.
1. Apply supply voltage minimum 5 minutes before calibration.
2. Press calibration button for 5 seconds to get transmitter in calibration
mode. Red LED changes from normal flash to OFF.
3. Decrease capacity to minimum and press calibration button
once. Red LED turns immediately ON. After 10 seconds red LED turns
OFF again, indicating that it is ready for 100% calibration.
4. Increase capacity to maximum and push calibration button
twice. Red LED starts flashing quickly. After 10 seconds red LED
changes to normal flash rate, indicating that calibration has been completed.
5. Calibration will be remembered even in case of power failure.
To return to “Factory Set Point”, press CAL. Switch for 20 seconds.
Indication of this is shown by a short flash of green and red LED (one after the other).
The 4--20 mA signal from the transmitter is permanently available. However, during calibration
the signal is based on the default calibration values so it will not show 0% at minimum capacity,
nor 100% at maximum capacity! Note that it is possible to reset to the default calibration by
keeping the button pressed for 20 seconds. However, it is the transmitter manufacturer’s de-
fault values which may differ very much from the correct values for the actual compressor. The
reset is indicated by the red and the green LED flashing briefly in turn a couple of times.
0171--977
8
YORK REFRIGERATION
Chr. X’s Vej 201 ·P. O . B o x 1 81 0 ·DK-8270 Højbjerg ·Denmark
Phone+4587367000 ·Fax +45 87 36 77 05
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Sabroe Mounting of new type of capacity rod on SAB 83, 85, 87, 89 screw compressors Installation guide

Brand
Sabroe
Model
Mounting of new type of capacity rod on SAB 83, 85, 87, 89 screw compressors
Type
Installation guide
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