COMPRESSOR SERVICE TOOL
CROSS-REFERENCE TO RELATED APPLICATION
[0001] Benefit is claimed of'U.S. Patent Application Ser. No. 60/824,885, filed
September 7, 2006, and entitled ''Compressor Service Tool", the disclosure of which is
incorporated by reference in its Entirety herein as if set forth at length.
BACKGROUND
[0002] The disclosure relates to refrigeration systems. More particularly, the disclosnre
relates to servicing of compressors of chiller systems.
[0003] FIG. 1 shows an exemplary chiller system 20 including a compressor 22. The
compressor drives refrigerant along a refrigerant circuit. The refrigerant is used to cool water
or another liquid for various purposes including building climate control. The exemplar/
compressor is housed within a bay 30 of a structure (support structure) 32. The exemplary
structure 32 includes longitudinal rails 34 supporting the system atop a ground surface 500
(e.g., a floor or roof surface of the building). Transverse rails 36 are mounted atop the
longitudinal rails 34. A pair of longitudinal compressor rails 38 and 40 are mounted atop the
rails 36 by vibration isolators 42. A pair of L-brackets or base flanges 44 and 46 form abase
of the compressor and are mounted atop the rails 38 and 40, respectively to support the
compressor 22. Behind the compressor, an oil separator 50 is also mounted atop the rails 38
and 40. Condenser coil units 60 of the refrigerant circuit are supported above the bay 30 by
the structure 32. For purposes of illustration, the exemplary system 20 is shown broken away
with other equipment (e.g., evaporators, additional compressors, and the like) not shown.
[0004] The compressor 22 must be periodically serviced. Servicing the compressor may
require its removal from the bay 30.
SUMMARY
[0005] One aspect of the disclosure involves a method for servicing an apparatus laving
a compressor mounted to a support structure. A guide structure is placed adjacent to the
support structure. The compressor is lifted from an installed position. The compressor is
withdrawn by rolling the compressor along the support structure and guide structure.
[0006] In various implementations, the rolling may include rolling the base of the
compressor along at least one plurality of rollers supported by the support structure and the
guide structure. Alternatively, the method may include moving a jack in a first direction

along the guide structure and at least partially on to the support structure. The raising may
comprise raising an end effector of the jack to lift the compressor. The withdrawing may
comprise retracting the jack opposite the first direction.
[0007] Other aspects of the disclosure involve the apparatus (e.g., a conveyor or means
for moving such a compressor or a system including the conveyor/means in combination with
aspects of the compressor, support structure, or other components). For example, a chiller
apparatus may include such a support structure, compressor, and conveyor/means.
[0008] The details of one or more embodiments are set forth in the accompanying
drawings and the description below. Other features, objects, and advantages will be apparent
from the description and drawings, and from the claims.

BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 is a partial view of a chiller system.
[0010] FIG. 2 is a partial view of a first service tool in an extracted condition.
[0011] FIG. 3 is a partial, partially exploded, view of a second service tool with the
compressor in an inserted/installed condition.
[0012] FIG. 4 is a partial side view of the tool of FIG. 3.
[0013] FIG. 5 is a partial side view of the tool of FIG. 3 with the compressor in an
extracted condition.
[0014] FIG. 6 is a partial view of a third service tool with the compressor is an
inserted/installed condition.
[0015] FIG. 7 is a side view of a carriage of the tool of FIG. 6 in a lowered condition.
[0016] FIG. 8 is a side view of the carriage of FIG. 7 in a raised condition.
[0017] FIG. 9 is a top view of the carriage of FIG. 7.
[0018] FIG. 10 is a perspective view of the carriage of FIG. 7.
[0019] FIG. 11 is a partial side view of the tool of FIG. 6.
[0020] FIG. 12 is a partial side view of the tool of FIG. 6 with the compressor in an
extracted condition.
[0021] Like reference numbers and designations in the various drawings indicate like
elements.

DETAILED DESCRIPTION
[0022] In one implementation, inboard portions 70 (FIG. 1) of the brackets 44 and 46
may be removed to expose inboard portions 72 (FIG. 2) of the tops of the rails 38 and 40. For
example, the portions 70 may be cut away in a retrofit of a compressor or eliminated relative
to a baseline in original manufacture of the compressor. A service tool 100 (FIG. 2) may then
be assembled to the chiller system. The exemplary tool 100 includes a pair of rails 102 and
104. Each rail 102 and 104 has a first end 106 configured to mate with the associated
outboard end of the associated one of the rails 38 and 40 to provide a pair of continuous
tracks or guide members. The rails may accommodate/engage/support/guide respective left
and right pairs of flanged wheels 108 of a trolley unit 110. The trolley unit includes a
hydraulic jack 112 having an upwardly-facing end effector 114. The opposite ends of the nils
each receive leveling means. Exemplary leveling means are jacks. Exemplary jacks are
endless jack screws 120.
[0023] The exemplary rails 102 and 104 are mounted to each other by adjustable
crossmembers 122 to permit appropriate alignment with the chiller rails. The rails 102 and
104 may be installed to the chiller as a unit. Thereafter, the trolley may be placed on the rails
102 and 104 in a relatively outboard position and with the jack 112 relatively lowered. The
trolley may then be translated forward by rolling along the rails. In a relatively inserted
position, at least the front two wheels are along the inboard portions 72 of the associated
chiller rails. The jack may then be raised so that the end effector 114 engages the underside of
the compressor to lift the compressor. Thereafter, the trolley and compressor may be
extracted as a unit to permit servicing. The exemplary extraction is from a first
condition/position wherein the compressor is within a footprint of the support structure (eg.,
at least half of a footprint of the compressor within a footprint of the support structure, more
typically entirely) to a second condition/position mostly clear of the support structure (the
compressor footprint at least half outside the support structure footprint, more typically
entirely outside the footprint).
[0024] FIG. 3 shows an alternate system 200 wherein rails/tracks/guide members 202 and
204 are formed similarly to the rails 38 and 40 as centrally upwardly-open, C-sectioned,
flat-flanged channels. The brackets 44 and 46 may be left intact. When installed, the inboard
ends of the tracks 202 and 204 align/mate with the outboard ends of the rails 38 and 40 to
form continuous tracks. With the tracks installed, the compressor may be raised slightly. For
example, it may be raised by jack screws 210 mounted to the brackets 44 and 46. The jack
screws 210 may be added and may engage the rails 38 and 40 or the floor.

[0025] Roller arrays 220 (e.g., a group of rollers 222 mounted between side plates 224
(e.g., of a channel)) may be used to extract and reinsert the compressor. In one example, the
arrays 220 are inserted along the rails 38, 40, 202, 204 extending from under the compressor
to adjacent outboard ends of the rails 202, 204 (rather, the side plates do not support the
rollers for free rotation). The rollers of such arrays do not contact the rails. The compressor
may be lowered (e.g., via the jack screws) onto the rollers (FIG. 4) and rolled out/extracted in
a direction 502 to a location remote of the support structure footprint 504 (FIG. 5), with the
rollers only rotating and their arrays not translated. The installation may be via a reverse of
this process.
[0026] In other implementations, the roller arrays may move (e.g., if the rollers engage
both the compressor and the trails, the arrays will move half the compressor translation
distance of the rail; if the rollers engage only the compressor, the arrays will move with the
compressor (e.g., as a carriage)). The arrays may be sized to permit this.
[0027] In yet other implementations, partial roller arrays are preinstalled along the rails
38 and 40.
[0028] In yet other implementations, a winch may replace or supplement the use of a jack
on a trolley or a jack used with rollers.
[0029] FIG. 6 shows an alternate system 300 wherein components in common with this
system 200 are referenced with like numerals. The system 300 uses a pair of moving (rolling)
roller units formed as carriages 302 in place of the roller arrays 220. The carriages 302 may
initially be positioned respectively in the tracks 202 and 204 and shifted (e.g., rolled) thereon
to positions below the compressor brackets 44 and 46, respectively. As is discussed further
below, the carriages may have a feature for jacking up the compressor to permit the
compressor to be rolled along the tracks via the carriages. Thus, the brackets 44 and 46 may
lack the jack screws 210.
[0030] FIG. 7 shows an exemplary carriage 302. The carriage has a frame 304 and a
plurality of rollers (e.g., wheels) 306 for rolling the carriage along the associated rails (e.g.,
along the rail web). For jacking the compressor, a jack mechanism 308 includes first and
second partial scissor jack elements 310 and 312 (shown raised in FIG. 8) commonly driven
by a jack screw 314 (e.g., which is rotated by a user such as by using a wrench). FIG. 7
shows a partially raised position in solid line and a lowered position in broken line. The
exemplary jack screw 314 acts directly upon the first element 312 and indirectly upon the
second element via connecting bars 316 (FIG. 9). Hinge portions 318 of the jack elements
310 and 312 serve as a jack end effectors for engaging the undersides of the brackets 44 and

46 to lift the compressor. After an exemplary unbolting of the brackets 44 and 46 from the
rails 38 and 40, the carriages 302 may be (in their lowered condition) rolled along the rails to
an inserted position below the compressor. Thereafter, the carriages may be jacked to a raised
condition to jack up the compressor. FIG. 11 shows the carriages inserted below the
compressor and jacking up the compressor. Once jacked up, the compressor and carriages
may be rolled out as a unit to the extracted position. FIG. 12 shows the compressor in the
extracted position. As with the other embodiments, insertion/reinstallation may be via a
reversal of the extraction/removal process.
[0031] One or more embodiments have been described. Nevertheless, it will be
understood that various modifications may be made. For example, details of the particular
compressors involved may influence details of the associated tools. Accordingly, other
embodiments are within the scope of the following claims.

CLAIMS
What is claimed is:
1. A method for servicing an apparatus (20), the apparatus having a compressor (22) mounted to a
support structure (32, 38, 40), the method comprising:
placing a guide structure (102, 104; 202, 204) adjacent the support structure (38, 40);
lifting the compressor (22) from an installed position; and
withdrawing the compressor by rolling the compressor along the support structure and the guide
structure.
2. The method of claim 1 further comprising at least one of:
inserting one of a plurality of roller units (220; 302) and a single trolley/jack (110, 112) on the
support structure beneath the compressor; and
moving a jack (112; 308) in a first direction along the guide structure and at least partially onto
the support structure, the raising comprising raising an end effector (114; 318) of the jack to lift the
compressor and the withdrawing comprising retracting the jack opposite the first direction.
3. A method for servicing an apparatus (20), the apparatus having a compressor (22) mounted to a
support structure (32, 38, 40), the method comprising:
placing a guide structure (102, 104; 202, 204) adjacent the support structure;
moving a jack (112; 308) in a first direction along the guide structure and at least partially onto
the support structure;
raising an end effector (114; 318) of the jack to lift the compressor from an installed position;
and
retracting the jack opposite the first direction to withdraw the compressor.
4. The method of claim 3 wherein:
the guide structure comprises first and second rails (102, 104);
the jack comprises first and second flanged wheels (108); and
the moving and retracting roll the first and second wheels along the first and second rails guided
by their flanges.

5. The method of claim 3 further comprising:
returning the jack in the first direction carrying the compressor;
lowering the compressor back to the installed position; and
unfastening the compressor from first and second support rails of the support structure, the
placing comprising engaging the first and second support rails with first and second rails (102, 104; 202,
204) of the guide structure.
6. The method of claim 3 wherein:
the installed position is below a condenser coil (60).
7. A chiller apparatus (20) comprising:
a compressor (22);
a support structure (32, 38, 40); and
a conveyor (100; 200; 300) apparatus coupled to the support structure to convey the compressor
from a first position within a footprint of the support structure to a second position in which the
compressor is mostly clear of the footprint.
8. The apparatus of claim 7 further comprising:
a condenser coil (60) above the compressor in the first position; and
an oil separator (50) behind the compressor in the first position, and
wherein the conveyor apparatus comprises:
first and second roller arrays (220) atop the support structure;
first and second extension rails (202, 204) extending forward from the support structure; and
third and fourth roller arrays (220) atop the first and second extension rails, respectively.
9. A compressor service tool comprising:
a first guide rail (102, 202);
a second guide rail (104; 204);
leveling means (120) for leveling the first guide rail and second guide rails when first ends of the
guide rails are coupled to a support structure; and

at least one roller unit (220; 302) engageable to the first guide rail and second guide rail for
guiding a compressor from a first position within a footprint of the support structure to a second position
in which the compressor is mostly clear of the footprint.
10. The compressor service tool of claim 9 wherein:
the at least one roller unit comprises a pair of roller units (302), each having:
a frame (304);
a plurality of rollers (306); and
a jack mechanism (308) comprising:
a first partial scissor jack element (310);
a second partial scissor jack element (312);
connecting bars (316); and
a jack screw (314) acting directly upon the first element and acting upon the second element via
the connecting bars.

In a method for servicing an apparatus having a compressor (22) mounted to a support structure (32, 38, 40), a guide structure (102, 104; 202, 204) is placed adjacent to the support structure. The compressor is lifted from an installed position. The compressor is withdrawn by rolling the compressor along the support structure and guide structure.