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Installation & Maintenance Data IM 283-8
Group: Fan Coil
Part Number: 106332300
Date: August 2000
Additional Installation Instruction for
Type HSS HiLine SeasonMaker Twin Units
Refer to Installation and Maintenance Bulletins 254 and 255 for additional information.
Twin opposite hand units share a common riser system; i.e.,
supply, return, and drain riser. This is commonly called a
“master/slave” arrangement. The master unit is shipped with
the risers attached. These special risers have stub-outs
which must be field connected to the slave units. In addition
to the instructions in bulletins IM 254 (KZZ units) or IM 255
(HSS units), the following procedures must be followed for
all twin unit installations.
1. The slave unit has no risers and no stub-outs. Knockout holes are provided for internal piping connections.
2. HSS-S10 and -S12 units will not match up with the
smaller units sizes S03, S04, S06 and S08 due to
differences in riser stub-out locations.
3. Master units are offered in two-pipe or four-pipe systems
with either right-hand or left-hand. Slave units are offered
to accomodate internal connections to any of these riser
systems or locations.
4. The riser location (right or left) is determined by facing
the return air grille panel. The risers are located on either
the right or left of the unit. This defines the riser location.
See Figure 1.
5. The riser block-off plates are located in the base of the
slave unit. Block-offs must be installed on slave before
putting unit into position. See Figure 8.
6. Install the master unit per IM 254 or IM 255.
7. Recommended wall opening sizes for the slave unit
stub-outs are shown in Figure 6.
8. The openings must provide enough space to allow
easy installation of the unit. During installation, the unit
is tilted at an angle to set into place. Unless the opening
in the wall is large enough, there will be interference
and the unit cannot be set into position.
9. Openings must be large enough to accommodate riser
stubs with foam insulation. An allowance must be made
for insulation thickness, fitting connections, and hand
valves on the stub-outs.
10. The opening in the wall must provide space for vertical
movement of riser stubs as a result of riser expansion
and contraction.
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11. The slave unit piping terminates with
⁄8" sweat connection. The piping is also supported inside the cabinet to
prevent any damage to them during shipment. This
support bracket must be removed to allow expansion or contraction in the piping after unit is installed.
12. On the slave units, the ball valves will not be attached to
the unit. The ball valves (quantity 2 on two-pipe, 4 on
four-pipe), if ordered from McQuay, will be shipped in a
separate box. The ball valves are not factory mounted to
the slave unit piping because there would be insufficient
room between ball valve and cabinet to make field
connections to the unit. The correct installation procedure as outlined in subsequent paragraphs is to first
mount the ball valves to the riser stub-outs and then set
the slave unit in place with the ball valves protruding
through the slave unit riser knockouts. The connections
can then be made between ball valves and unit piping
within the HiLine slave unit.
Figure 1. HiLine Twin Unit Arrangements
Right-Hand
Master
Left-Hand
Slave
Left-Hand
Master
Wall
Right-Hand
Slave
Note: Arrows refer to return air panel position
©2000 McQuay Incorporated
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Figure 2. Return Air Grille and Plaster Frame HSS/KZZ Sizes S03 Thru S08
Figure 3. Riser Location Plan View
Page 2 / IM 283
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Figure 4. Return Air Grille and Plaster Frame HSS/KZZ Sizes S10 & S12
Figure 5. Riser & Discharge Locations (Plan View)
IM 283 / Page 3
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Figure 6. HSS HiLine Twin Unit (sizes S03, S04, S05, S06, S08)
Recommended Wall Openings for Riser Stub-outs
Note: Wall openings are shown as seen looking at riser side of master unit.
Master unit riser stub-outs should be centered vertically in wall opening.
Two-Pipe System Four-Pipe System
Left-Hand
Unit
Outline
5" (127mm) 5" (127mm)
3" (76mm)
14"
(356mm)
3"
(76
mm)
1"
(25mm)
1" (25mm)
3" (76mm)
Wall Opening
for Supply and
Return Stubs
Wall Opening
for Drain Stub
1" (25mm)
14"
(356mm)
20"
(508mm)
14"
(356mm)
Wall Opening
for Supply and
Return Stubs
41"
(1041mm)
Wall Opening
for Drain Stub
5" (127mm)
1" (25mm)
5" (127mm) 5" (127mm)
Right-Hand
Unit Outline
3"
(76
mm)
5" (127mm) 5" (127mm)
(356mm)
1"
(25mm)
14"
20"
(508mm)
5" (127mm)
1" (25mm)
Page 4 / IM 283
5"
(127mm)
5" (127mm)
Wall Opening
for Supply and
Return Stubs
Wall Opening
for Drain Stub
1" (25mm)
(356mm)
20"
(508mm)
14"
5"
(127mm)
5" (127mm)
Wall Opening
for Supply and
Return Stubs
Wall Opening
for Drain Stub
1" (25mm)
(356mm)
20"
(508mm)
41"
(1041mm)
14"
Page 5
Figure 7. HSS HiLine Twin Unit Field Piping
Figure 8. HSS HiLine Twin Unit Riser Block-offs
Master Unit
Floor
Risers
Partition
Slave Unit
Riser Stub-out
Field
Supplied
Tubing
Master
Unit
Block-off for
Master Unit
Riser Block-offs
for Slave Unit
Drain
Riser
13. The length of tubing between the
5
⁄8" O.D. slave unit
stub-out and the hand valve for the slave unit is to be
provided by the contractor (see Figure 7). The length will
be determined by the dimension between the walls.
After the master unit is set in place, the field supplied
tubing should be sweated to the riser stub-outs and ball
valves sweated to the field supplied tubing. Hand valves
should be closed and risers pressurized to locate any
leaks. Leaks should be repaired before slave units are
installed and access is restricted.
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14. Stub-outs from the supply and return risers are 43
(1105mm) on center from the bottom of the unit. They
are to be made of
5
⁄8" copper tubing on unit sizes S03
⁄2"
through S08. The standard stub-out length is 23⁄4"
(70mm) beyond the outside diameter of the riser.
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15. The drain stub-out is either
⁄2" PVC or 5⁄8" O.D. copper,
depending on which was ordered for the job.
16. Slave unit stub-outs should be well insulated by the
contractor to prevent condensation problems.
17. Remove the appropriate riser and drain knockouts in the
lower cabinet of the slave unit.
18. Slit the fiberglass insulation so that the riser ball valves
can be pushed through and into the slave unit.
19. Install the slave unit riser block-off plates as shown in
Figure 8.
20. Position the slave unit to the hand valves. The horizontal
stub-outs should be centered in the opening in the
cabinet.
21. Solder connections if sweat valves have been supplied.
22. Attach plastic drain hose to the drain line. Be sure hose
clamp is properly installed and that there are no kinks in
the hose.
23. With unit in final location, check level to insure proper
condensate drainage and operation.
24. Use IM 254 or IM 255 to complete the installation of the
slave unit.
25. Figure 9 shows a typical example of a master/slave
arrangement for a two-pipe system. For four-pipe master/slave riser location, refer to Certified Drawing
#405017Y.
IM 283 / Page 5
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Figure 9. Typical 2-Pipe Master/Slave Arrangement
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7
⁄8"
(181mm)
7" (178mm)
Left-Hand Master UnitRight-Hand Slave Unit
Supply &
Return Risers
Knockouts Provided
for Internal Piping
Connections 3" x 3"
(76mm x 76mm)
43
(1105mm)
57⁄8" (149mm)
Supply &
Return
Stub-outs
1
⁄4" (83mm)
3
1
⁄2"
Drain Riser
*Drain Stub-out
4" Dia.
(102mm)
4"
(102mm)
20"
(508mm)
*Stub-outs are of 1⁄2" PVC plastic or 5⁄8" O.D. copper for
drain risers and
5
⁄8" copper for supply and return riser.
Installation and maintenance are to be performed only by qualified personnel who are familiar with and in
compliance with state, local and national codes and regulations, and experienced with this type of equipment.
Caution: Sharp edges and coil surfaces are a potential injury hazards. Avoid contact with them.
Page 6 / IM 283
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Notes
IM 283 / Page 7
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AAF-McQuay Incorporated
4900 Technology Park Boulevard, Auburn, NY 13021-9030 USA (315) 253-2771
Printed on recycled paper containing at least 10% post-consumer recycled material.
IM 283 (Rev. 8/00)
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