McQuay HSS S30 Installation Manual

Group: Fan coil
Part Number: # 106332400
Date: August 2000

©2000 McQuay Incorporated

SeasonMaker®Hi-Line Fan-coil Unit
Model HSS S30 through S80

Installation & Maintenance Data

IM 255-6

Table of Contents

Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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.

When the equipment is received, all items must be carefully
checked against the bill of lading to be sure all crates and
cartons have been received. The units are normally shipped
four to a pallet. Visible or concealed damage should be
reported immediately to the carrier and a claim filed to him for

damage. The electrical nameplate should be checked to be
sure it agrees with the power supply available. DO NOT
HANDLE UNITS BY THE RISER PIPING. Riser clamps are
used to hold the riser in position. They should not be
expected to support the weight of the cabinet.

Inspection

1. Place unit over riser hole in the floor. Adjust location so
riser extensions align with risers on unit below.

2. Isolator pads (not provided by McQuay) if used, must be
in place before connecting riser.

3. The horizontal stubs protruding into the cabinet from the
risers must be centered in the 3” (75mm) slot in the panel
before risers are soldered in place. This is important to
allow for riser expansion or contraction of ±1” (25mm).
Riser normally extends approximately 5” (127mm) above
the cabinet when the stub is centered in the slot.

4. The unit has provision for ±1” (25mm) of riser movement
due to expansion or contraction. Risers must be anchored
to the building structure in such a manner to prevent
vertical riser movement in excess of ±1” (25mm).

5. Risers must be anchored to the building as there is no
provision on the unit to support the weight of the risers.

6. Care must be taken to prevent dirt and other foreign
matter from entering the risers as plugged lines or valves
could result.

7. With the unit in the final location, check level to insure
proper condensate drainage and operation.

8. Connect supply and return risers by soldering slip
couplings. (Reducing couplings not supplied by McQuay).
Join drain riser with coupling using PVC solvent cement
on both surfaces (or solder if riser is copper).

9. Apply insulation (available from McQuay) to risers
between floors and cement joints to avoid condensation
problems.

10. To assure compliance with existing building codes, the
installing contractor must restore the original fire
resistance rating of the structure by sealing the access
space around the risers with material having the same fire
rating as the structure. This procedure is very important
also in assuring that a seal is provided 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.

11. Vent the coils. Vent is accessible from return air opening.

12. Hydrostatically test riser and unit connection joints to
assure they are leakproof before unit is furred in.

13. The thermostat box has been installed in the front panel in
the position that will allow plasterboard to be attached
directly to the unit. If the installation requires that the wall
be furred out away from the unit, the box can be adjusted
out to 37/8” (98mm) by removing the four screws "A" (see
Figure 2), and pulling the box out. Replace screws "A". If
a dimension other than the 37/8” or 3/8” (98mm or 10mm) is
required, this can be accomplished using the angle
bracket as a template and drilling .149" (4mm) diameter
screw holes in the box at the desired depth.

14. When the plasterboard or other wall material does not fit
flat against the face of the unit, extension sleeves must be
furnished by the contractor for both the return and supply
air openings.

15. Wire in accordance with local codes or the National
Electric Code, whichever is applicable. Provide branch
circuit overcurrent protection and disconnect means. The
complete system wiring diagram is located on the front
cover. Bring electrical wiring through the side of the
cabinet into the wiring box located on the right-hand side
of the cabinet (see Figures 3 and 5). Two 7/8” (22mm)
diameter knockouts for wire entrance are provided.

16. The unit mounted combination thermostat and fan switch
has a quick disconnect plug for insertion into a receptacle
in the back of the thermostat box to complete the internal
wiring. The return air bulb on the thermostat must then be
strung through the hole in the back of the thermostat box
and down through the hole in the deck support angle and
attached to the bulb clip below the fan deck (see Figure

3). Be sure the rubber grommets are in place where the
capillary tube passes through the panels.

17. Rotate the fan wheel by hand to make sure the wheel is
free.

18. If ducts are being added, be sure the resistance is within
the limits of the external static pressures shown in the
catalog for the particular unit being installed. The ducts
should be designed for velocities in accordance with the
methods outlined in the ASHRAE Guidebooks. It is
recommended that the airborne noise be controlled with
sound attenuating materials and by installing flexible
connection between the unit and ductwork. Ductwork
should be installed in accordance with NFPA 90A and
NFPA 90B.

19. When furring in units, make sure that no screws (other
than grille or plaster frame attaching screws) or nails
penetrate the unit cabinet. Grille or plaster frame attaching
screws should never penetrate the cabinet more than 2”
(51mm).

20. The plaster frame should be attached on the opening over
the top of the plasterboard. Use the plaster frame as a
template to drill pilot holes into the wall or unit for the
attaching screws. (See Figure 6).

In order for the grille panel to fit the plaster frame properly,
the plaster frame must be mounted with the corners
square. When the plaster frame has been mounted to the
unit, attach the two retaining clips (supplied with the
plaster frame) to the plaster frame adjacent to the lower
attaching screws. (See Figure 7).

INSTALLATION

Page 2 / IM 255

Figure 1. Return Air Grille and Plaster Frame HSS/KZZ Sizes S03 Thru S08

Figure 2. Riser Location Plan View

Page 3 / IM 255