Allied Air 4SCU14LE SERIES Kurulum ve Bakım Talimatları Kılavuzu - Sayfa 3

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1. Maintenance

Slab Mounting

Discharge Air

Building

Structure

Unit must be grounded in accordance with national and local

codes. Failure to ground unit properly can result in personal

injury or death.

Refer to the furnace or blower coil Installation Instructions

for additional wiring application diagrams and refer to unit

rating plate for minimum circuit ampacity and maximum

overcurrent protection size.

1. Install line voltage power supply to unit from a properly

sized disconnect switch. Any excess high voltage field

wiring should be trimmed or secured away from the low

voltage field wiring.

2. Ground unit at unit disconnect switch or to an earth

ground. To facilitate conduit, a hole is in the bottom of the

control box. Connect conduit to the control box using a

proper conduit fitting. Units are approved for use only

with copper conductors. 24V Class II circuit connections

are made to the low voltage pigtails. A complete unit wiring

diagram is located inside the unit control box cover (see

also page 18 of this instruction).

3. Install room thermostat on an inside wall that is not subject

to drafts, direct sunshine, or other heat sources.

4. Install low voltage wiring from outdoor to indoor unit and

from thermostat to indoor unit (see Figure 3).

5. Do not bundle any excess 24V control wire inside control

box. Run control wire through installed wire tie and tighten

wire tie to provide low voltage strain relief and to maintain

separation of field-installed low and high voltage circuits.

506251-01

Mounting Slab

Ground Level

Figure 2

WARNING

Thermostat Designations

Thermostat

Cooling

Indoor Blower

See unit wiring diagram for power supply connections.

If the indoor unit is not equipped with a blower relay, one must be

field supplied and installed.

Do not connect C (common) connection between indoor unit and

thermostat except when required by the indoor thermostat. Refer

to thermostat installation instructions. C (common) connection

between indoor unit and outdoor unit required for proper

operation.

Refrigerant Piping

Refrigerant can be harmful if inhaled. Refrigerant must

always be used and recovered responsibly. Incorrect or

irresponsible use of refrigerant can result in personal injury

or death.

If the 4SCU14LE unit is being installed with a new indoor

coil and line set, the refrigerant connections should be made

as outlined in this section. If an existing line set and/or indoor

coil will be used to complete the system, refer to this section

as well as the section that follows entitled Flushing Existing

Line Set and Indoor Coil.

If this unit is being matched with an approved line set or indoor

coil which was previously charged with R22 refrigerant, the

line set and coil must be flushed prior to installation. If the unit

is being used with an existing indoor coil which was equipped

with a liquid line which served as a metering device (RFCI),

the liquid line must be replaced prior to the installation of the

4SCU14LE unit.

Field refrigerant piping consists of liquid and suction lines

from the outdoor unit (sweat connections) to the indoor coil

(flare or sweat connections).

Select line set diameters from Table 2 on page 4 to ensure

that oil returns to the compressor. Size vertical suction riser

Issue 1015

Indoor Unit

Power

Outdoor

Unit

Heat

Figure 3

WARNING

Y1 Outdoor Unit

C Outdoor Unit

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