System Refrigerant - Lennox Elite XC16−024−230 Installation Instructions Manual

6. Set the thermostat for a cooling demand. Turn on
power to the indoor indoor unit and close the outdoor
unit disconnect switch to start the unit.
7. Recheck voltage while the unit is running. Power must
be within range shown on the nameplate.
8. Check system for sufficient refrigerant by using the
procedures listed under System Charge.
GAUGE SET
CONNECTIONS FOR TESTING AND CHARGING
AClose manifold gauge set valves and connect the center hose to a cylinder of HFC−410A. Set for liquid phase charging.
BConnect the manifold gauge set's low pressure side to the suction line service port.
CConnect the manifold gauge set's high pressure side to the liquid line service port.
DPosition temperature sensor on liquid line near liquid line service port.
START: Determine how refrigerant is metered
WHEN TO CHARGE?
S
Warm weather best
S
Can charge in colder weather
CHARGE METHOD? Determine by:
S
Metering device type
S
Outdoor ambient temperature
REQUIREMENTS:
S
Sufficient heat load in structure
S
Indoor temperature between 70-80ºF (21−26ºC)
S
Manifold gauge set connected to unit
S
Thermometers:
− to measure outdoor ambient temperature
− to measure liquid line temperature
− to measure suction line temperature
506637−01 11/10
SUCTION LINE
B
SERVICE PORT
CONNECTION
CHARGE IN
LIQUID PHASE
D
TEMPERATURE
SENSOR
Figure 15. Gauge Set Setup and Connections
Figure 16. Determining Charge Method

System Refrigerant

This section outlines procedures for:
1. Connecting gauge set for testing and charging;
2. Checking and adjusting indoor airflow;
3. Adding or removing refrigerant.
MANIFOLD GAUGE SET
LOW
REFRIGERANT TANK
A
DIGITAL SCALE
C
TO LIQUID
LINE SERVICE
VALVE
65ºF (18.3ºC)
and ABOVE
APPROACH OR
SUBCOOLING
(SECOND STAGE − HIGH
CAPACITY)
Page 22
HIGH
OUTDOOR UNIT
TEMPERATURE SENSOR
(LIQUID LINE)
TXV
OUTDOOR AMBIENT
TEMPERATURE
64ºF (17.7ºC)
and BELOW
WEIGH-IN
VAPOR LINE
SERVICE VALVE
LIQUID LINE
SERVICE VALVE