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ME 4120-308-15/3-9
Figure 3-9. Fresh air damper door control chain.
mum INCREASE position, check for continuity
between terminals 1 and 2. Continuity should be
indicated. If no continuity is indicated, thermo-
stat is defective and must be replaced.
c. Removal.
( 1 ) Refer to paragraph 3-26 and remove the
control panel.
(2) Refer to figure 3-11 and remove the
thermostat.
d. lnstallation. Installation is the reverse of re-
moval.
3-29. Two-speed Condenser Fan
Selector Switch.
a. General. The two-speed switch provides the
user the option of selecting either HI-SPEED or
LO-SPEED air circulation. When the switch is
placed in the HI-SPEED position, the fan speed
will remain constant until the unit is either shut
down or the switch is placed in the LO-SPEED
position. When the air conditioner is operated
with the fan switch in the LO-SPEED position,
an increase in compressor discharge pressure to
400 (±16) psig will actuate the normally open
pressure switch (S3), causing the switch to close
and the fan speed to increase to HI-SPEED.
When the discharge pressure drops to 350 (±16)
psig, the pressure switch (S3) contacts will re-
3-14
turn to normally open and the fan speed will re-
turn to LO-SPEED.
b. Testing.
(1) With power off and switch in HI-
SPEED position, remove wire No. V3C16 from
(fig. 1–40) and check continuity between it and
X2 of K5. Continuity should be indicated. If con-
tinuity is not indicated, switch is defective and
must be replaced.
(2) With power off and switch in LO-
SPEED position, remove wire No. V3C16 from
XF2 (fig. 1-4 0) and check for no continuity be-
tween it and X2 of K5. Continuity should not be
indicated. If continuity is indicated, switch is de-
fective and must be replaced.
c. Removal.
(1) Refer to paragraph 3-26 and remove the
control panel.
(2) Refer to figure 3-11
switch.
d. lnstallation. Installation
moval.
3-30. Junction Box
and remove the fan
is the reverse of re-
a. General. The junction box is located at the
bottom front of the air conditioner. Access is
gained by removing the f rent access cover. The
junction box houses the phase sequence relay, ar-
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