McQuay HSS Installation Manual
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.
5
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
Figure 2. Return Air Grille and Plaster Frame HSS/KZZ Sizes S03 Thru S08
Figure 3. Riser Location Plan View
Page 2 / IM 283
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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