McQuay HSS S12 Installation Manual

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

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.

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

+ 11 hidden pages