14
Heating Check Chart Procedure (See Fig. 24 -- 28)
(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 mo de 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 Char ge Method is selected, the system will operate by
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. 24, 26 or 27 based the OD unit
size.
To use the Heating Check Chart in non --communicating systems,
operate system at Y1+Y2–high stage. These charts indicate
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 char ging is necessary during heating season, charge
must be weighed in accordance with unit rating plate,
±0.6 oz./ft
(
±17.74 g/m). of 3/8--in. liquid--line above or below 15 ft (4.57
m), respectively.
Heating Check Chart - 24A, 25
For use in Heating Charging Mode only - For all AHRI listed indoor combinations
0
50
100
150
200
250
300
350
400
450
10 20 30 40 50 60
Vapor Service
Valve Pressure
Suction Pressure
80ºF ID (27ºC)
70ºF ID (21ºC)
60ºF ID (16ºC)
(-12ºC)
(-1ºC)
(-7ºC)
(4ºC) (10ºC) (16ºC)
Outdoor Ambient Temperature ºF (ºC)
Refrigerant Pressure (psig)
2757
2413
2068
1724
1380
1034
690
345
0
3102
Refrigerant Pressure (KPa)
(36ºC)
65
Fig. 24 -- Heating Pressure Check Chart 288BNV024A, 25
Heating Check Chart - 24B
Fig. 25 -- Heating Pressure Check Chart 288BNV024B
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: II288B--- 03
Replaces: II288B--- 02
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