EMI WLCA installation manual Electrical Data

3.Condensate pipework should slope downwards in the direction of water flow with a minimum gradient of (1” per 10’). There must not be any uphill gradients other than in the first 18” of pipework from the Cassette.

4.When multiple Cassettes are connected to a common condensate drain, ensure the drain is large enough to cope with the volume of condensate from several Cassettes. It is also recommended to have an air vent in the condensate pipework to prevent any air locks.

DUCT COLLARS: Branch duct and fresh air duct collars can be attached to the Cassette chassis by following the steps below:

1.Refer to the relevant illustration for your Cassette (pages 6 -7 in this IOM) to become familiarized with knock-out hole locations.

2.The insulation is pre-cut to aid location and removal of the relevant section. Rub hand across surface of insulation to reveal exact location of knock-out.

3.Remove the metal knockout from the chassis.

4.Attach the duct collar to the chassis using self tapping screws.

NOTE: Branch ducts are round and 5 - 6” in diameter. Fresh Air ducts are square and 3” in diameter.

INSULATION: Refrigerant, chilled water and condensate pipes should be insulated right up to the Cassette chassis. Chilled water valves must also be insulated to prevent sweat- ing.

ASSEMBLY: Once the services have been connected the four fascia mounting bolts can be unscrewed approximately 1” from the condensate tray support channels.

The fascia can now be unpacked ready for fitting to the Cas- sette chassis. Ensure the black fir tree fasteners holding the fascia polystyrene are pushed in firmly in case of transit vibration. If a fascia aperture needs blanking off, then take one of the polystyrene blanking pieces and push it into the recess in the polystyrene fascia insulation. Fit by removing the inlet grilles and filters, locating the four fascia mounting bolts on the chassis through the four keyhole brackets on the fascia and then sliding the fascia sideways until it locks into position.

NOTE: Up to two non-adjacent sides can be blanked off.

NOTE: On electro-mechanical units, the fascia must be installed with the EMI logo along the same edge of the unit as the electrical panel. On units fitted with microprocessor controls, orient the fascia with the dis- play panel along the same edge of the unit as the electrical panel.

FASCIA BLANKING PIECE

SECTION THROUGH FASCIA

Before tightening the fascia to the unit, connect the two halves of the vane motor’s plug and socket connection (where ap- plicable).

On microprocessor controlled units, ensure that the display panel cable is routed to the electrical panel and securely fastened to its connector on the microprocessor circuit board. (Refer to the unit’s electrical wiring schematic). Take care to ensure that the connector is connected in the proper ori- entation and that the wires are not routed such that they may become trapped, cut, broken or chaffed.

The fascia can now be tightened up to the Cassette chassis until a good seal is obtained between fascia and chassis.

NOTE: Do not over tighten the bolts. To do so may cause damage to the fascia.

With filters in place, the inlet grilles can now be fitted to the fascia to complete the installation.

ELECTRICAL DATA

(See Appendix 1 on page 18 for wiring charts and instruc- tions.)

All power and interconnecting wiring between units should be carried out to conform with local/national electrical codes. A fused and dedicated electrical supply of the appropriate phase, frequency and voltage should be installed by the cus- tomer. It is also recommended that a local disconnect switch be connected within 3’ of the unit. In some areas this may be a code requirement.

EMI equipment in its standard form is designed for an elec- trical supply of 208-230V, 1Ph, 60Hz. When connection to a 115V, 1Ph, 60Hz supply is necessary, a factory mounted buck boost transformer will be fitted to the unit.

The wires should be capable of carrying the maximum load current under non-fault conditions at the stipulated voltages. Avoid large voltage drops on cable runs, particularly in low voltage wiring. The correct cable size must be used to en- sure a voltage drop of less than 1 volt in the control wiring. Once the refrigeration pipe work is complete, the electrical supply can be connected by routing the cable through the appropriate casing hole and connecting the supply and ground cables to the unit’s power terminals. On the medium and large cabinets, it will be necessary to remove the insulated condensate tray support rail, adjacent to the casing hole.

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