2
Airflow
Airflow amount and distribution are vital to adequate system
performance. Problems that can be experienced with incorrect
airflow include:
S
low system performance
S
restricted TXV
S
frosted coil
S
poor humidity control
S
water blow--off
When attaching the coil and building the plenum, pay special
attention to the effect these details will have on airflow. After
system start--up, check the cfm to insure that it is correct.
(Generally, the cfm should be 350 to 400 cfm/ton during normal
cooling operation.)
TXV
A thermal expansion valve is utilized in this coil design to optimize
performance and comfort throughout the entire operating range of
the system. Special attention needs to be taken to the TXV when
installing the coil
S
Do not overheat valve. Temperatures that exceed 212
_
F (100
_
C)
can harm valve performance. Use a wet cloth or heat sink when
brazing.
S
Place liquid filter dryer near ID unit to reduce the risk of debris
clogging the valve.
S
Make sure TXV bulb is securely fastened and wrapped in the
indentation on vapor line tube.
CNPVP Models:
These coils have a factory--installed hard--shutoff TXV designed
only for use with R--410A refrigerant. Use only with outdoor units
designed for R--410A.
CNRVP Models:
These coils have a factory--installed hard--shutoff TXV designed
only for use with R--22 refrigerant. Use only with outdoor units
designed for R--22.
NOTE
: All TXV’S have preset superheat settings and are not
field--adjustable.
Cabinet Sweating
If this unit is installed in a garage, attic, or other unconditioned
space, special attention needs to be given to the potential of cabinet
sweating. A 6” (152 mm) wide piece of insulation should be
wrapped around the coil casing and supply duct connection point.
Inspect Equipment
File claim with shipper if equipment is damaged.
Select Installation Procedure
NOTE
: Installing coils rotated 90
_
from the front of the furnace,
in upflow or downflow applications, can cause water blow--off or
coil freeze--up due to the concentration of air on one slab of the coil
or lack of air to a slab in the coil. It is recommended that on this
type of application, a field--supplied adapter be placed between the
coil and furnace to allow air to distribute properly between all slabs
of the coil.
To install cased coils in upflow applications, follow the instructions
below,
Upflow Cased Coil Installation.
To install cased coils in downflow applications, follow the
instructions below,
Downflow Cased Coil Installation.
To install uncased coils in upflow applications, follow the
instructions below,
Upflow Uncased Coil Installation.
See Table 1 for dimensions and overhang options. Refer to
instructions for placement of coil casing on furnace
.
Table 1 – CNPVP/CNRVP CASED COIL INFORMATION
MODEL NUMBER
TONS
FLUSH FIT
TO FURNACE
WIDTH IN. (mm)
COIL
CONNECTION
TUBE SIZE
IN.
SHELF WIDTH
(See Fig. 1,
Dim. A)
IN. (mm)
FITS NEXT SMALLER FURNACE
Equal
Overhang
Overhang with
Transition
Offset Left
Liquid
Suction
*CN(P,R)VP1814A(C,T)A
1---1/2
14---3/16 (360)
3/8
5/8
12---7/8 (327)
---
---
---
*CN(P,R)VP2414A(C,T)A
2
14---3/16 (360)
3/8
5/8
12---7/8 (327)
---
---
---
CN(P,R)VP2417A(C,T)A
2
17---1/2 (445)
3/8
5/8
16---3/16 (411)
---
X
X
*CN(P,R)VP3014A(C,T)A
2---1/2
14---3/16 (360)
3/8
3/4
12---7/8 (327)
---
---
---
CN(P,R)VP3017A(C,T)A
2---1/2
17---1/2 (445)
3/8
3/4
16---3/16 (411)
---
X
X
*CN(P,R)VP3617A(C,T)A
3
17---1/2 (445)
3/8
3/4
16---3/16 (411)
---
X
X
*CN(P,R)VT3617A(C,T)A
3
17---1/2 (445)
3/8
3/4
16---3/16 (411)
X
---
---
CN(P,R)VP3621A(C,T)A
3
21 (533)
3/8
3/4
19---5/8 (498)
---
X
X
*CN(P,R)VP4221A(C,T)A
3---1/2
21 (533)
3/8
7/8
19---5/8 (498)
---
X
X
*CN(P,R)VT4221A(C,T)A
3---1/2
21 (533)
3/8
7/8
19---5/8 (498)
X
---
---
*CN(P,R)VP4821A(C,T)A
4
21 (533)
3/8
7/8
19---5/8 (498)
---
X
X
*CN(P,R)VT4821A(C,T)A
4
21 (533)
3/8
7/8
19---5/8 (498)
X
---
---
CN(P,R)VP4824A(C,T)A
4
24---1/2 (622)
3/8
7/8
23---1/8 (587)
---
X
X
*CN(P,R)VP6024A(C,T)A
5
24---1/2 (622)
3/8
7/8
23---1/8 (587)
---
X
X
*CN(P,R)VT6024A(C,T)A
5
24---1/2 (622)
3/8
7/8
23---1/8 (587)
X
---
---
* In these models the coil can be removed from the casing and installed as an uncased coil without needing to field fabricate the coil enclosure to prevent air bypass.
NOTES
:
For the 3rd digit position in the model number; P = Puron (R---410A) refrigerant and R=R---22
For the 5th digit position in the model number; P = painted cabinet, T = transition coil
For the 11th digit position in the model number; C = standard copper and T= tin plated copper
CNP
VP
/CNR
VP
