Installation Manual

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Specifications subject to change without notice.
For standard refrigerant line lengths (80ft/24.4 m or less), allow
system to operate in cooling mode at least 25 minutes. If conditions
are favorable, check system charge by subcooling method. If any
adjustment is necessary, adjust charge slowly and allow system to
operate for 25 minutes to stabilize before declaring a properly
charged system.
If the indoor temperature is below 70°F (21.11°C), or the outdoor
temperature is not in the favorable range, adjust charge for line set
length above or below 15ft (4.57 m) and indoor fan coil /furnace
coil per Table 4. Charge level should then be appropriate for the
system to achieve rated capacity. The charge level should then be
checked at another time when the both indoor and outdoor
temperatures are in a more favorable range.
NOTE: If the line length is beyond 80ft (24.38 m) or greater than
20ft (6.10 m) vertical separation see Long line guideline for special
charging requirement.
Table 2 – Required Charge (values in lbs.)
Adjustment for Indoor Coil Model
Furnace Coil or
Fan Coil Model
24 25 36 37 48 49 60
EA*4X24 - - / / / / /
EHD4X24 - - / / / / /
EHD4X30 - - / / / / /
F(V,C)M4X24 / - - / / / /
EA*4X30 - - / / / / /
EN(A,D)4X30 - - / / / / /
ENH4X36 - - - - / / /
F(V,C)M4X36 / - - - / / /
EA*4X36 - +.50 - - / / /
END4X42 +.50 +.50 - +.75 / / /
EA*4X42 +.50 +.50 - +.75 / / /
EHD4X36 +.50 +.50 - +.75 / / /
EHD4X42 +.50 +.50 +.75 +.75 / / /
EN(A,D)4X31 +.50 +1.25 +.75 +.75 / / /
EN*4X48 +.50 +1.25 +.75 +.75 - - /
EHD4X48 +.63 +1.25 +.75 +1.00 - - /
EN(A,D)4X37 +.63 +1.25 +.75 +1.00 - - /
EN(A,D)4X43 +.63 +1.25 +.75 +1.00 - - /
EA*4X48 / / +.75 +1.00 - - /
EN*4X60 / / / +1.00 - +.13 -
EHD4X60 / / / +1.00 - +.13 -
F(V,C)M4X48 .63 +1.25 +.75 +1.00 - +.13 /
F(V,C)M4X60 / / +.75 +1.00 +1.50 +.63 +1.00
EA*4X60 / / / / +1.50 +.63 +1.00
EN*4X61 / / / / +1.50 +.63 +1.00
/ = Comb. not allowed
- = No charge adjust for ID
Note: Charge adders are in decimal format
Fig. 10 - Charging in Cooling Mode CVA9, HVA9, TVA924
Fig. 11 - Charging in Cooling Mode CVA9, HVA9, TVA925
Fig. 12 - Charging in Cooling Mode CVA9, HVA9, TVA936
Fig. 13 - Charging in Cooling Mode CVA9, HVA9, TVA937
Fig. 14 - Charging in Cooling Mode CVA9, HVA9, TVA948