Manual 2100-220
Page 6
10. Connect leads with fork terminal to corresponding
points on terminal strip. Re.: C.Y.G. (See wiring
diagram.)
11. Wire nut leads with 5/8” stripped ends to Y1 and
Y2 leads from thermostat. See wiring diagram in
this manual.
NOTE:
Wires referenced in note one on wiring diagram
are for special control application only and are
not normally used in conjunction with other
circuitry to open the damper regardless of
outside temperature and humidity. Consult
factory for details.
12. Close control panel cover
13. Reinstall the blower access panel at top of unit
and secure with sheet metal screws.
14. Replace filter and screws in front condenser
grille.
15.
ECONOMIZER CHECK OUT
A. Remove mist eliminator (Figure 2). Locate the
minimum position potentiometer. (See
Figure 3.)
B. Energize the evaporator blower by switching
thermostat to the manual fan position with
heat/cool in the OFF position.
C. Cycle the minimum position potentiometer
(factory set for 0% fresh air) 0 to full open.
(See Figure 3.) Throughout checkout
procedure observe operation of damper to
insure there is free, unobstructed operation
through the entire angle of damper travel.
Then adjust the damper minimum open
position to meet local codes or application
requirements. See example below.
EXAMPLE:
1. Measure return air temperature (RAT)
(assume 75° F for example).
2. Measure outdoor air temperature (OAT)
(assume 60° F for example).
3. Calculate the mixed air temperature (MAT)
which will result from the desired
combination of OAT (10 percent) and RAT
(90 percent).
.1 OAT + .9 RAT = MAT
or substituting example values
.1(60° F) + .9 (75° F) = 73.75° F
4. Adjust the minimum position potentiometer
knob until proper mixed air temperature as
calculated above is reached. Care should
be taken to insure thermometer is sensing
air that is well mixed.
5. Mark correct setting on dial of minimum
position potentiometer for future reference.
D. Adjust the enthalpy control to position A, B,
C and D to achieve the maximum combination
of temperature and humidity acceptable for the
installation as per Table 2 below. The
suggested setting is between A & B 70° DB
@ 55 percent RH. It is further recommended
to always set the control at C or above.) (See
Figure 3.)
E. Switch the thermostat fan control to automatic
and position the heat/cool switch to cool.
Adjust the thermostat temperature to engage
the first stage of cooling only (Y). This will
cause the dampers to modulate to achieve
mixed air temperature of 55° provided outside
air enthalpy is sufficiently low. If enthalpy is
too high for economizing, low enthalpy can be
simulated by temporarily removing and
jumping leads on terminal 2 and 3 of enthalpy
control together. This will also cause the
economizer damper to modulate away from
minimum position. (
Be sure to properly
reconnect leads at end of checkout
procedure
).
F. Readjust temperature on the thermostat to
engage the second stage of cooling (Y2).
The damper motor should return to previously
set minimum position. Compressor motor
should start.
G. Switch thermostat to OFF fan and OFF heat/
cool positions to de-energize unit.
Economizer damper should return to full
closed (100 percent return air) position.
Checkout is complete.
16. Replace control access panel and mist eliminator.
17. Remove blank off plate or barometric fresh air
damper if installed on the service access panel.
Plug the four (4) holes used to mount the BOP or
BFAD with the plastic plugs supplied with the
economizer.
18. Replace service access panel.
19. Economizer is now ready for operation.
TABLE 2
l
a
i
D
g
n
i
t
t
e
S
%
0
2
H
R
%
0
5
H
R
%
0
8
H
R
y
p
l
a
h
t
n
E
l
o
r
t
n
o
C
g
n
i
t
t
e
S
A
F
.
g
e
d
8
7
)
C
.
g
e
d
6
2
(
F
.
g
e
d
3
7
)
C
.
g
e
d
3
2
(
F
.
g
e
d
8
6
)
C
.
g
e
d
0
2
(
B
F
.
g
e
d
3
7
)
C
.
g
e
d
3
2
(
F
.
g
e
d
8
6
)
C
.
g
e
d
0
2
(
F
.
g
e
d
3
6
)
C
.
g
e
d
7
1
(
C
F
.
g
e
d
8
6
)
C
.
g
e
d
0
2
(
F
.
g
e
d
3
6
)
C
.
g
e
d
7
1
(
F
.
g
e
d
9
5
)
C
.
g
e
d
5
1
(
D
F
.
g
e
d
2
6
)
C
.
g
e
d
7
1
(
F
.
g
e
d
8
5
)
C
.
g
e
d
4
1
(
F
.
g
e
d
3
5
)
C
.
g
e
d
2
1
(
Содержание EIFM-5
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Страница 7: ...Manual 2100 220 Page 5 FIGURE 3 MIS 350...
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