Carrier Infinity 25VNA8 Installation Instructions Manual page 13

Heating Check Chart Procedure (See Fig.16 - - 18)
(Communicating / Non- - communicating Systems)
In heating mode, the required charging method is by weigh- -in. On
new installations or complete recharge, refer to the unit 0 and
indoor fan coil / furnace coil per Table 3 for additional charge
needed. Refrigerant charge adjustment amount for adding or
removing 0.6 oz/ft (17.74 g/m) of 3/8 liquid line above or below
15ft (4.57 m) respectively.
Use the Defrost CHECKOUT mode to remove ice or frost from
coil, if present, prior to checking the heating pressures.
To use the Heating Check Chart, the user interface (UI) must be in
Refrigerant Charging mode selected from the Installation and
Service screen. The Charging Mode Selection screen will show
selections for Weigh- -In Charge Method or Heating Check Charge
Method. Select Heating Check Charge Method. The Heating
Check Charge method will only be displayed if the conditions are
right for checking the charge in heating mode. When Heating
Check Charge Method is selected, the system will operate by
Heating Check Chart - 24, 25
For use in Heating Charging Mode only - For all AHRI listed indoor combinations
450
Vapor Service
400
Valve Pressure
350
300
250
200
150
Suction Pressure
100
50
0
10 20 30
(-7ºC)
(-12ºC) (-1ºC)
Outdoor Ambient Temperature ºF (ºC)
Fig. 16 - - Heating Pressure Check Chart 25VNA824, 25
Fig. 17 - - Heating Pressure Check Chart 25VNA836
Fig. 18 - - Heating Pressure Check Chart 25VNA848
running in stage 5 with appropriate outdoor fan speed and indoor
airflow. Upon completion of a countdown period for system
stabilization, check refrigerant pressures for the appropriate
ambient temperatures shown in Fig. 16, 17 or 18 based the OD unit
size.
To use the Heating Check Chart in non- -communicating systems,
operate system at Y1+Y2–high stage.
whether a correct relationship exists between system operating
pressure and air temperature entering indoor and outdoor units. If
pressure and temperature do not match on chart, system refrigerant
charge may not be correct. DO NOT USE CHART TO ADJUST
REFRIGERANT CHARGE.
NOTE: High pressure is at vapor service valve. Add 12 psig if
high pressure is taken from liquid service valve.
NOTE: When charging is necessary during heating season, charge
must be weighed in accordance with unit rating plate,
( 17.74 g/m). of 3/8- -in. liquid- -line above or below 15 ft (4.57
±
m), respectively.
40 50 60
(4ºC) (10ºC) (16ºC)
13
These charts indicate
0.6 oz./ft
±
3102
2757
2413
2068
1724
1380
1034
690
345
0
65
(36ºC)