Trane 4TTM3018 Installer's Manual page 27

STEP 5 - Locate the Charging Table (pages 20-21 of
this document) that corresponds to the model being
tested. Using the Outdoor Ambient Temperature
(LINE 1) and Suction Line Pressure (LINE 2) from
the Charge Verification Worksheet, cross-reference
this system's Liquid Target Temperature. Enter
this amount in LINE 5 of the Charge Verification
Worksheet.
Liquid
Target Temp.
Outdoor Temp (LINE 1)
Enter on
LINE 5
Suction
Line
Pressure
(LINE 2)
INDEPENDENT CHARGE VERIFICATION WORKSHEET
LINE 1:
Outdoor Ambient Temp ______________F˚
from step 1
LINE 2: Suction Line Pressure _______________
from step 2
LINE 3: Liquid Line Pressure _________________
from step 3
LINE 4:
Liquid Line Temp __________________F˚
from step 4
LINE 5: Liquid Temp Target _________________F˚
from step 5
LINE 6:
Liquid Line Saturation Temp __________F˚
from step 6
CALCULATE SUBCOOLING DIFFERENCE
Actual Subcooling
from line 7
-
Target Subcooling
from line 8
Subcooling Difference
18-AC78D1-6
4TTM3060A1
___________ F˚
-
___________ F˚
=
____________ F˚
STEP 6 - Using the Liquid Line Pressure measured
in Step 3, determine the Liquid Saturation
Temperature using a standard Pressure and
Temperature Chart. Record the result on LINE 6 of
the Charge Verification Worksheet.
STEP 7 - Calculate the value for Actual Subcooling
and enter the result on LINE 7 of the Charge
Verification Worksheet.
STEP 8 - Calculate the value for Target Subcooling
and enter the result on LINE 8 of the Charge
Verification Worksheet.
STEP 9 - Calculate the Subcooling Difference and
determine if the value is within the tolerance range.
CALCULATE ACTUAL SUBCOOLING
Liquid Line Saturation Temp
from line 6
Liquid Line Temp
from line 4
LINE 7: Actual Subcooling
CALCULATE TARGET SUBCOOLING
Liquid Line Saturation Temp
from line 6
Liquid Line Temp Target
from line 5
LINE 8: Target Subcooling
If the Subcooling Difference is within the
tolerance range the system has passed the
Charge Verification.
If Subcooling Difference is NOT within the
tolerance range, the system has FAILED the
Charge Verification.
You have completed the Independent Charge
Verification for this system.
___________ F˚
-
___________ F˚
=
___________ F˚
___________ F˚
-
___________ F˚
=
___________ F˚
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