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XP25
System Refrigerant
IMPORTANT !
The system must be operating at full capacity during
charging. Increase (heat) or decrease (cooling) the
thermostat setting by 5°F to create system demand.
Confirm outdoor unit running capacity on the display
on the outdoor control. Value should be 100%.
This section outlines procedures for:
1.
Connecting gauge set for testing and charging as
illustrated in figure 63.
2.
Checking and adjusting indoor airflow as described in
figure 64.
3.
Adding or removing refrigerant using the weigh-in
method shown in figure 65, and verifying charge using
subcooling method described in figure 66.
IMPORTANT
- Unit must be operating at 100% input to
charge properly.
ADDING OR REMOVING REFRIGERANT
This system uses HFC-410A refrigerant which operates at
much higher pressures than HCFC-22. The pre-installed
liquid line filter drier is approved for use with HFC-410A
only. Do not replace it with components designed for use
with HCFC-22.
COOLING MODE INDOOR AIRFLOW CHECK
Check airflow using the Delta-T (
D
T) process using the
The diagnostic screen on the thermostat or outdoor control
7-Segment display shows indoor and outdoor motor CFMs
or RPMs.
TO LIQUID
LINE SERVICE
VALVE
TEMPERATURE
SENSOR
DIGITAL SCALE
REFRIGERANT TANK
TEMPERATURE SENSOR
(LIQUID LINE)
MANIFOLD GAUGE SET
A
CLOSE MANIFOLD GAUGE SET VALVES AND CONNECT THE CENTER HOSE TO A CYLINDER OF HFC-410A. SET FOR LIQUID PHASE CHARGING.
B
CONNECT THE MANIFOLD GAUGE SET'S LOW PRESSURE SIDE TO THE TRUE SUCTION PORT.
C
CONNECT THE MANIFOLD GAUGE SET'S HIGH PRESSURE SIDE TO THE LIQUID LINE SERVICE PORT.
D
POSITION TEMPERATURE SENSOR ON LIQUID LINE NEAR LIQUID LINE SERVICE PORT.
OUTDOOR UNIT
CHARGE IN
LIQUID PHASE
CONNECTIONS FOR TESTING AND CHARGING
GAUGE SET
A
C
D
LOW
HIGH
B
INSIDE OUTDOOR UNIT
TRUE SUCTION PORT
CONNECTION
Figure 63. Gauge Set Connections
