Step 12 - Heating Check Charge - Carrier Infinity 25VNA4 Installation Instructions Manual

25VNA4: Installation Instructions
Fig. 17 – Select Line Set Length & Vapor Line Diameter
Fig. 18 – Adjust Line Set Length & Vapor Line Diameter that is
Fig. 19 – Charging Mode Selection
Fig. 20 – Additional Required Charge for New Installation
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Installed
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Fig. 21 – Total Charge Required for a Complete Charge
Step 12 – Heating Check Charge
In heating mode, the required charging method is by weigh-in. On new
installation or complete recharge, refer to the refrigerant charging screen
in the user interface (UI) to obtain the required charge adjustment and/or
total charge required (see
Check Charts (located on the inside of the control box cover) to check
system operation during HEATING mode. The indoor conditions must
be between 60°F (15.6ºC) and 80°F (26.7ºC) to check the charge. The
outdoor coil must be dry and ice/frost free. Do not check for pressure
agreement if the outdoor has rain, mist or snow present.
Use the force defrost mode, which is available by shorting the forced
defrost pins (J9) for more than 5 seconds, to remove ice or frost from
coil, if present, prior to checking the heating pressures.
To use the Heating Check Chart:
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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 running with
appropriate compressor speed, outdoor fan speed and indoor airflow.
The charts located on the inside of the control box cover 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. IF CHARGE IS IN DOUBT, REMOVE CHARGE AND
WEIGH-IN CORRECT
CHARGE.
NOTE: High pressure is at vapor service valve. Connect low side gauge
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to suction service port.
NOTE: When charging 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).
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10
Fig. 20 & Fig. 21). Use the UI and Heating
CALCULATED REFRIGERANT
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