CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
7
A150034
Fig. 7 – AOC Control Board for 1 and 2 Ton
A14021
Fig. 8 – AOC Control Board for 3, 4 and 5 Ton
C
HECK
C
HARGE
Charging Procedure: Force system to operate in high stage cooling by
creating a large differential between room temperature and set point on
thermostat. Use multi-meter to verify that 24 VAC is present between C,
Y1 /Y2 terminals at outdoor unit.
Factory charge amount is shown on unit rating plate for high stage.
Target subcooling chart is provided on back of control box door see
-
for example. To properly check or adjust charge,
condition must be favorable for subcooling charging. Favorable
conditions exists when outdoor temperature is between 65°F (18°C) and
100°F (38°C), and the indoor temperature is between 70°F (21°C) and
80°F (27°C). Follow the procedure below:
Unit is factory charged for 15ft (4.57 m) of lineset. Adjust charge by
adding or removing 0.6 oz/ft (17.7 g/m) of 3/8 liquid line above or below
15ft (4.57 m) respectively. Inaccurate charging may result in nuisance
fault codes.
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
and
. 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 4 – Required Charge Adjustment for Indoor Coil Model - HP
Furnace Coil or
Fan Coil
Model
Number
24
25
36
37
48
60
EA*4X24
/
/
/
/
/
/
EHD4X24
/
/
/
/
/
/
EHD4X30
/
/
/
/
/
/
F(V,C)M4X24
-
-
-
-
/
/
EA*4X30
-
/
/
/
/
/
EN(A,D)4X30
-
/
/
/
/
/
ENH4X36
-
-
-
-
/
/
F(V,C)M4X36
-
-
-
-
/
/
EA*4X36
-
-
-
-
/
/
END4X42
+.50
-
-
+.75
/
/
EA*4X42
+.50
-
-
+.75
/
/
EHD4X36
/
-
-
+.75
/
/
EHD4X42
/
+.75
+.75
+.75
/
/
EN(A,D)4X31
/
+.75
+.75
+.75
/
/
EN*4X48
/
+.75
+.75
+.75
-
/
EHD4X48
/
+.75
+.75
+1.00
-
/
EN(A,D)4X37
/
/
/
/
/
/
EN(A,D)4X43
/
/
/
/
/
/
EA*4X48
/
/
+.75
+1.00
-
/
EN*4X60
/
/
/
+1.00
-
-
EHD4X60
/
/
/
+1.00
-
-
F(V,C)M4X48
/
+.75
+.75
+1.00
-
/
F(V,C)M4X60
/
/
/
+1.00
+2.2
+1.00
EA*4X60
/
/
/
/
+2.2
+1.00
EN*4X61
/
/
/
/
/
/
/ = Comb. not allowed
- = No charge adjust for ID
Note
: Charge adders are in decimal format
