Table
7
-3: Minimum Wire Size Based on N.E.C. for 60 C Type Copper Conductors Below
100 Ampacity.
Copper Wire Size - AWG
(1% Voltage Drop)
Supply Wire Length - Ft
Supply Circuit
Ampacity
50
100
150
200
15
14
10
8
6
20 12
8
6
4
25 10
8
6
4
30 10
6
4 4
35 8
6
4
3
40 8
6
4
2
45 6
4
3
2
50 6
4
3
1
20
7.9 SYSTEM STARTUP
7.10 OPERATION
The installer must be familiar with the location of the over-current protection, properly size for this
this application and the proper procedure for disconnecting power service to the unit.
transformer as shown on the wiring diagram.
The outdoor unit control wiring requires a 24 Volt minimum, 25 VA service from the indoor
The location of the disconnect device must be in accordance with local codes.
1.Turn thermostat to "OFF", turn on power supply at disconnect switch.
3.Turn fan switch to "ON". Indoor blower should run. Be sure it is running in the right direction.
4.Turn fan switch to "AUTO". Turn system switch to "COOL" and turn temperature setting below
room temperature. Unit should run in cooling mode.
6.Check the refrigerant charge (see Instructions under "Charging the System").
7.Replace service port caps. Service port cores are for system access only and will leak if
not tightly capped.
9.Instruct the owner on operation and maintenance.
Leave this "Installation and Operating Manual" and the "Use and Care Manual" with owner.
8.Check unit for tubing and sheet metal rattles.
2.Turn temperature setting above the room temperature.
5.Check to see if compressor and outdoor fan are running correctly.
SEQUENCE OF OPERATION
COOLING CYCLE
1.
2.
The vapor leaves the compressor and passes through the reversing valve.
4.
In order to service and troubleshoot a air conditioning system, The service technician must
understand the system’s sequence of operation. This is the order of events the system undergoes in
response to. Understanding the sequence of operation aid in determining where to start troubleshooting
when the unit doesn’t operate properly. Deviation from the normal operation sequence will provide
3. The vapor flows through the outdoor vapor line to the finned outdoor coil. Air from the outdoor
clues to system problems.
Mechanical
.
The operation sequence is as follows:
fan removes heat from the refrigerant vapor. When enough heat is removed, the vapor
condenses into a high pressure liquid.The liquid temperature leaving the outdoor coil is slightly
This warm, high pressure liquid leaves the outdoor coil, and flows through the small copper
The compressor provides high pressure, superheated refrigerant vapor.
warmer than ambient air temperature.
Central Air Conditioner
Model: Cooling Only,
13
SEER
units
