JOhNsON CONTROLs
19
FORM ET115.24-NOM5 (908)
ELECTRICAL WIRING & CONTROLs
The electrical operation of each unit is determined by
the components and wiring of the unit and may vary
from unit to unit. Consult the wiring diagram for the
actual type and number of controls provided on each
unit. The integrity of all electrical connections should be
verified at least twice during the first year of operation.
Afterwards, all controls should be inspected regularly
for proper operation. Some components may experience
erratic operation or failure due to age. Wall thermostats
may also become clogged with dust and lint and should
be periodically inspected and cleaned to provide reliable
operation.
When replacing any components such as fuses,
contactors, or relays, use only the exact type, size, and
voltage component as furnished from the factory. Any
deviation without factory authorization could result
in personnel injury or damage to the unit and will
void all factory warranties. All repair work should be
done in such a manner as to maintain the equipment in
compliance with governing codes and ordinances or
testing agency listings.
More specific information regarding the use and
operating characteristics of the standard controls offered
by this manufacturer is contained in other manuals.
VALVEs & PIPING
No formal maintenance is required on the valve package
components most commonly used with fan coil units
other than a visual inspection for possible leaks in the
course of other normal periodic maintenance. In the
event that a valve should need replacement, the same
precautions taken during the initial installation to protect
the valve package from excessive heat should also be
used during replacement. In some cases, the valve
actuator may fail and usually can be replaced without
removing valve body from piping.
FILTERs, THROWAWAY
The type of throwaway filter most commonly used on
fan coil units should be replaced on a regular basis.
The time interval between each replacement should be
established based on regular inspection of the filter and
should be recorded in the log for each unit. Refer to the
chart below for recommended filter size for each product
type and size. If the replacement filters are not purchased
from the factory, the filters used should be the same type
and size as that furnished from or recommended by the
factory. Pleated media or extended surface filters should
not be used since the high air pressure drops encountered
with these types of filters is not compatible with the
type of fan coil unit covered in this manual. Consult the
factory for applications using filter types other than the
factory standard or optional product.
UNIT
SIZE
COIL FACE
AREA
RETURN AIR
GRILLE FREE AREA
SUPPLY AIR
GRILLE FREE AREA
FILTER FACE
AREA
NOMINAL FILTER SIZES
20
1.04 [.09]
0.47 [.04]
0.40 [.04]
1.18 [.11]
20 x 8.5 x 1
[508 x 216 x 25]
25
1.35 [.13]
0.58 [.05]
0.50 [.05]
1.54 [.14]
26 x 8.5 x 1
[660 x 216 x 25]
30
1.56 [.14]
0.68 [.06]
0.56 [.05]
1.77 [.16]
30 x 8.5 x 1
[762 x 216 x 25]
40
2.08 [.19]
0.81 [.08]
0.80 [.07]
2.36 [.22]
(2) 20 x 8.5 x 1
[508 x 216 x 25]
50
2.60 [.24]
1.01 [.09]
0.96 [.09]
2.95 [.27]
(1) 20, (1) 30 x 8.5 x 1
[508, 762 x 216 x 25]
60
3.13 [.29]
1.15 [.11]
1.20 [.11]
3.54 [.33]
(2) 30 x 8.5 x 1
[762 x 216 x 25]
F
ace Area, Free Area and Filter Sizes
NOTES:
1. Face and free areas are in square feet
[square meters].
2. Filter sizes are in inches [millimeters].
3. Free area of ENVIRO -TEC® Model
HLE and T elescoping Bottom Panel
return grilles.
4. Free area of ENVIRO -TEC ® Model
HLE supply grille and minimum free
area allowable for a supply grille
supplied by others.
LD13897
