Installation and Maintenance IM 168-6
Hi-Line™ Fan Coil Unit
Models HSS S10 and S12
Group: Fan Coil
Part Number: 667753900
Date: December 2005
© 2005 McQuay International
Contents
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Receiving and Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Furring In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Ducts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Finishing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Twin Units Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Drain Pans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Fan and Motor Removal - S10 & S12 . . . . . . . . . . . . . . . . . . 12
Electric Heater Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 12
Electric Heater Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
McQuay and MicroTech II are registered trademarks of McQuay International.
Copyright © 2005 McQuay International. All rights reserved throughout the world.
General Information
McQuay HiLine fan coil air conditioning units are designed
for use in multiple floor apartments, office buildings, hotels,
and other similar applications. They require a minimum
amount of floor space and one unit may do the job that
formerly required more than one conventional unit.
The 1000 and 1200 cfm draw-through configuration units
described in this manual are designed for multiple discharge
arrangements so that one unit can serve more than one room.
Two-pipe and four-pipe systems are available, with single,
double, triple, and top discharge arrangements. Optional
equipment is available to provide complete application
flexibility.
Installation and maintenance must follow accepted industry
practices as described in the ASHRAE Handbook, the National
Electric Code, and other applicable s t a n da r d s . Install this
equipment in accordance with regulations of authorities having
jurisdiction and with all applicable codes.
Installation and maintenance must be performed by qualified
personnel familiar with applicable codes and regulations and
experienced with this type of equipment.
CAUTION
SHARP EDGES ON SHEET METAL AND COIL SURFACES
if not avoided could result in cuts.
Figure 1: HiLine fan coil unit
Couplings
Risers
Discharge Air
Cabinet
Controls
Sweat ball valves
Access & sound
baffle panel
Receiving and Handling
Carefully check items against the bills of lading to verify all
crates and cartons have been received. The units normally ship
four to a pallet.
Carefully inspect all units for shipping damage. Report
damage immediately to the carrier and file a claim.
Check the electrical nameplate to be sure it agrees with the
power supply available.
DO NOT handle units by the riser piping. Riser clamps hold
the riser in position; they are not designed to support the
cabinet weight. They are removed after the unit is installed.
Units are completely factory assembled and wired and have
individual thermostat controls. They are installed by stacking
one unit on top of the other. While installing, prevent dirt and
other foreign matter from entering the risers and plugging lines
or valves.
Return air grille panel
Filter
Coil
Risers
McQuay IM 168-6 1
Installation
Cabinet
1 Lift and position unit in place directly above the unit on the
floor below. See Figure 2a.
2 Align riser extensions with risers on unit below.
3 If field-supplied isolator pads are used, install them now
before connecting risers.
4 Before anchoring the risers in place, center the horizontal
stubs protruding into the cabinet in the 3" (75 mm) slots in
the panel risers. This allows for riser expansion or
contraction of plus or minus one inch. Risers extend 5"
(127 mm) above the cabinet when the stub is centered in
the slot.
5 Anchor risers to the building structure to prevent vertical
riser movement greater than ±1" (25mm) due to riser
expansion or contraction.
CAUTION
The unit is not designed to support the weight of the risers.
Anchor them securely to the building structure.
6 With the unit in position, check that it is level to provide
proper condensate drainage and operation.
7 Connect supply and return risers to unit on floor below
(Figure 2c) by soldering slip couplings (reducing
couplings, if required, are not supplied by McQuay).
8 Join drain riser with coupling using PVC solvent cement on
both surfaces (or solder if riser is copper).
9 Apply insulation to risers and to cement joints between
units to avoid condensation problems. (Not provided by
McQuay).
10 After the unit is installed, remove the riser ties.
11 Restore the fire resistance rating of the structure to comply
with existing building codes, by sealing the access space
around the risers with material having the same fire rating
as the structure. Also provide a seal between floors to
prevent the passage of warm, humid air, which can cause
condensation on riser insulation. This is most critical in
unpressurized buildings with high infiltration rates.
12 Vent the coils. The vent is accessible from the return air
opening.
13 Before furring in unit, hydrostatically test the riser and unit
connection joints to make sure they are leakproof.
Figure 2: Installation overview
2a. Placing unit above unit
on the floor below.
2b.Unit already in place,
ready to accept the
unit above.
2c. Making connections.
2d.Unit “furred in” with
grille attached and
thermostat wired.
2e. Completely installed
unit.
2 McQuay IM 168-6
Figure 3: Dimensional detail
Thermostat Box Detail
Installation
Right Hand Unit Shown
Hand of unit determined by facing return air opening.
Risers on right = Right hand unit.
Risers on left = Left hand unit.
Risers on back = Neutral unit.
Note – (1) With return air grille mounted on unit, dimension becomes 4-3/4”.
(2) Can be field adjusted to 3-7/8” for furred-in application.
McQuay IM 168-6 3
Installation
Furring In
1 When furring in units, make sure no screws or nails
penetrate the unit cabinet, other than grille or plaster frame
attaching screws. Grille or plaster frame attaching screws
should not penetrate the cabinet more than 2" (51 mm).
2 The thermostat box can be positioned up to 3 7/8" (98 mm)
from the unit for furring in. The mud ring can be positioned
vertically or horizontally and has 2" x 4" opening. (See
Figure 3).
3 If the wall board or other wall material does not fit flat
against the face of the unit, install field-supplied extension
sleeves for both the return and supply air openings.
Wiring
The complete unit system wiring diagram is located on the
front of the access panel. Wire in accordance with local codes
or the National Electrical Code, whichever is applicable.
1 Provide branch circuit overcurrent protection and
disconnect means.
2 Bring electrical wiring through the side of the cabinet into
the wiring box located on the right side of the cabinet (see
Figure 3 Side View) using the two 7/8" (22 mm) diameter
knockouts.
Note– When routing wiring through the cabinet, make sure
the fan remains accessible for possible removal.
3 Connect control wiring to the unit-mounted thermostat and
fan switch or a remote mounted control.
Note– A remote mounted 10 K thermistor is mounted on all
units for sensing return air temperatures. The 10 K
sensor is also provided with all factory purchased
thermostats.
4 Rotate the fan wheel by hand to make sure it rotates freely.
• Design the ducts for velocities in accordance with the
methods outlined in the ASHRAE guidebooks.
• Control airborne noise by installing sound attenuating
materials and by installing flexible connections between the
unit and ductwork.
Finishing
1 Attach the return air grille plaster frame on the opening
over the top of the wall board. Use the wall board frame as
a template to drill pilot holes into the wall or unit for the
attaching screws (see Figure 4).
Note – Mount the plaster frame with the corners square so that
the grille panel will fit over it properly.
2 Attach the supplied retaining clips to the plaster frame
adjacent to the lower attaching screws (see Figure 5 on
page 5).
Figure 4: Grille panel with plaster frame
Ducts
If ducts are added:
• Install in accordance with NFPA 90A and 90B.
• Check that the resistance is within the limits of the external
static pressures shown in the catalog for the particular unit
being installed.
4 McQuay IM 168-6
Figure 5: Plaster frame retaining clip installation
Installation
Twin Units Installation
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 connections. Secondary
units are offered to accommodate 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 6.
Figure 6: HiLine Twin Unit Arrangements
Right-Hand
Master
Wall
Left-Hand
Secondary
Note–Arrows refer to return air panel position.
5
The riser block-off plates are located in the base of the
Left-Hand
Master
Right-Hand
Secondary
slave unit. Block-offs must be installed on the slave unit
before putting it into position. (see Figure 8 on page 7).
6 Install the master unit per IM 254 or IM 255.
7 Recommended wall opening locations for the slave unit
risers and stub-outs are shown in Figure 7 on page 6.
McQuay IM 168-6 5
Installation
Figure 7: Riser and stub-outs lo ca tions
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.
11 The slave unit piping terminates with 5/8" sweat
connections. 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 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 ball valves (quantity 2 on two-pipe, 4 on four-pipe), if
ordered from McQuay, will be shipped in a separate box.
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.
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. 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.
14 Stub-outs from the supply and return risers are 35" (889
mm) on center from the bottom of the unit. They are to be
made of 7/8"copper tubing for the supply and return
cooling, and 5/8" for the supply and return heating. The
standard stub-out length is 2 3/4" (70 mm) beyond the
outside diameter of the riser.
15 The drain stub-out is either 1/2" PVC or 5/8" O.D. copper,
depending on which was ordered for the job.
16 Secondary 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.
6 McQuay IM 168-6
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.
Figure 8: Riser block-off plates
Installation
Position the slave unit to the hand valves. The horizontal
20
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 provide proper
condensate drainage and operation.
24 Use IM 254 or IM 255 to complete the installation of the
slave unit.
25 Figure 6 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 CD-FC-HSS
10-12 Specs.
McQuay IM 168-6 7
Wiring Diagrams
Figure 9: 2-Pipe (041538651)
Figure 10: 4-Pipe (041538652)
8 McQuay IM 168-6
Figure 11: 2-Pipe with 1 circuit electric heat (041538653)
Wiring Diagrams
Figure 12: 4-Pipe with 2 circuit electric heat (041538654)
McQuay IM 168-6 9
Start-Up
CAUTION
Prior to unit start-up, make sure no foreign material remains in
the unit, paying particular attention to the drain pan and drain
line. Blocked drains can result in drain pan water overflow.
1 Remove all foreign material from unit.
2 Open supply and return water service valves.
3 If the unit does not have the automatic flow control option,
balance the water flow rate with the hand valve on the
return line.
4 Install the front access panel.
5 Put the filter into position.
6 Install the return air grille.
7 Close all windows and doors.
8 Switch the unit to ON and check for proper operation of
fans, fan speed switch, and thermostat.
Note – When there is a high amount of moisture in the air, this
initial pull down should be gradual to reduce the
possibility of unit sweating (i.e., high fan speed for
maximum air flow with reduced GPM and elevated chilled
water temperature for reduced capacity). Do not operate
outside air supplies or toilet exhaust systems until the
gradual pull down is complete.
10 McQuay IM 168-6
Maintenance
Filters
• Clean filters to obtain maximum unit performance.
• Inspect filters every three or four months under normal
operating conditions and replace when necessary.
• Do NOT operate units without a filter.
Drain Pans
• In areas where airborne bacteria or other microorganisms are
known to produce growth in the drain pan, treat the water
chemically to minimize the problem. Contact your local
McQuay representative or one of the many companies
dealing with water conditioning.
• The condensate drain pan can pick up lint and dirt,
especially with dirty filters. Inspect the drain pan twice a
year to avoid the possibility of overflow.
Fan Motor
Note – The fan motor is oiled at the factory. Under continuous
• Oil the fan motor every six months with one teaspoon or 5 cc
operation; it is not necessary to oil it in the first six
months.
per bearing of SAE No. 20 nondetergent oil. Do NOT
overlubricate.
Coil
• The coil must be clean to obtain maximum performance.
• Check the coil once a year, under normal operating
conditions. If it is dirty, brush or vacuum clean. Take care
not to damage the aluminum fins while cleaning.
CAUTION
SHARP EDGES ON SHEET METAL AND COIL SURFACES
if not avoided could result in cuts.
McQuay IM 168-6 11
Service
WARNING
Before removing or replacing any component, lock out and tag
out all power to the unit. Live electrical components, fans and
belts can cause severe personal injury or death.
11
Disassemble the motor from the motor mount assembly.
12
T o reassemble, reverse the above steps.
To reassemble, reverse the above steps.
Electric Heater Troubleshooting
Fan and Motor Removal - S10 & S12
If fan or motor service is required, remove th e fan motor through
the return air opening as follows:
1
Shut off electrical power to the unit.
2
Remove the return air grille panel.
3
Remove the front access panel.
4
Disconnect the fan motor leads at the wiring box.
5
Remove the two nuts holding the side fan housing support
angles to the fan deck.
6
Lower the front side of the fan housing, allowing the back fan
housing support angle to unhook from the fan deck (Figure 13).
Figure 13: S10 and S12 fan housing assembly
McQuay electric heater elements, if furnished, are designed with a
high limit control set to trip when cabinet temperatures reach
175°F and automatically reset when cabinet temperatures drop to
140°F.
If the high limit temperature is tripping, the unit is not performing
properly. Some probable causes are
•
Not enough air over the heater due to dirty filter
•
Fan motor not operating
•
Dirty coil
•
Fan wheel loose on the motor shaft
•
Loose electrical connections
Electric Heater Removal
If the electric heater requires service, remove it as follows:
1
Shut off electrical power to the unit.
2
Remove the discharge grille.
3
Reach through the opening and remove sheet metal screws A
and
B
as shown in Figure 14.
4
Lift the entire element out of the sheet metal frame as shown in
Figure 14.
5
Replace the defective part and reinstall the heater.
7
Remove the fan housing through the return air opening.
8
Loosen the shaft setscrew.
9
Remove the three screws holding the motor mount assembly to
the fan housing.
10
Remove the motor and mount assembly from the fan housing.
Figure 14: Replacing high limit control or heater detail
When requesting service or replacement parts, direct your
inquiries to McQuayService. Refer to the model number and
the serial number of the heater stamped on the serial plate
attached to the heater kit. If replacement parts are required,
provide the date of the heater kit installation and the date of the
failure. Also, describe the part being replaced and explain its
malfunction.
12 McQuay IM 168-6
McQuay Training and Development
Now that you have made an investment in modern, efficient McQuay equipment, it s care should be a high priority.
For training information on all McQuay HVAC products, please visit us at www.mcquay .com and click on train ing, or
call 540-248-9646 and ask for the Training Department.
Warranty
All McQuay equipment is sold pursuant to its standard terms and conditions of sale, including Limited Product
Warranty. Consult your local McQuay Representative for warranty details. Refer to Form 933-43285Y. To find your
local McQuay Representative, go to www.mcquay.com.
This document contains the most current product information as of this printing. For the most up-to-date product
information, please go to www.mcquay.com.
Products Manufactured in an ISO Certified Facility.
© 2005 McQuay International • www.mcquay.com • 800-432-1342 12/05
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