(0 to 400 psig = 0 to 28 kg/cm(0 to 400 psig = 0 to 28 kg/cm
up for testing highup for testing high
pressure switchpressure switch
h as outlined in section 4.13.1.h as outlined in section 4.13.1.
ct ohmmeter or ct ohmmeter or
uity light across switchuity light across switch
will indicate resistancwill indicate resistanc
continuity light will be lighted if switch closed aftercontinuity light will be lighted if switch closed after
relieving pressure.relieving pressure.
Connect switch to a cylinder of dry nitrogen (seeConnect switch to a cylinder of dry nitrogen (see
Figure 4-10).Figure 4-10).
Set nitrogen pressure regulator higher than cutoutSet nitrogen pressure regulator higher than cutout
and cut-in points are shown in section 2.3.and cut-in points are shown in section 2.3.
Close valve on cylinder and open bleed-off valve.Close valve on cylinder and open bleed-off valve.
Open cylinder valve. Slowly close bleed-ofOpen cylinder valve. Slowly close bleed-of
ure until the sure until the s
is used, light will go is used, light will go
ohmmeter will move).ohmmeter will move).
PRESSURE CUTOUT SWITCHPRESSURE CUTOUT SWITCH
ate new sensor (refer to section 3.18.4)ate new sensor (refer to section 3.18.4)
Screw into placeScrew into place
Start the unit after having instalStart the unit after having instal
led a manometer onled a manometer on
pump down suction line.pump down suction line.
Using an ohmmeter or continuity light, verify thatUsing an ohmmeter or continuity light, verify that
switch opens or switch opens or
closes accordicloses accordi
Repeat checkout procedure until switch actuates atRepeat checkout procedure until switch actuates at
correct gauge reading.correct gauge reading.
After switch is adjusted, place a small amount ofAfter switch is adjusted, place a small amount of
not change switch not change switch
There are two types of receiver sight glasses; theThere are two types of receiver sight glasses; the
interchaneable.interchaneable.
(Refer to Section 3.5b)(Refer to Section 3.5b)
glass assemblyglass assembly
assembly and install.assembly and install.
Leak check receiLeak check recei
ver sight glass per Section 3.6.ver sight glass per Section 3.6.
Add refrigeraAdd refrigera
nt charge. (Refer to section 3.8).nt charge. (Refer to section 3.8).
noncondensibles.noncondensibles.
rd cartons isrd cartons is
The recycled The recycled
The fiber dust The fiber dust
and particles are drawn into theand particles are drawn into the
evaporator where they lodge between the evaporatorevaporator where they lodge between the evaporator
repetitive defrosts and loss of unit capacity. Due to therepetitive defrosts and loss of unit capacity. Due to the
“washing” action of normal defrost the fiber dust and“washing” action of normal defrost the fiber dust and
particles may not be visible on the face of the coil butparticles may not be visible on the face of the coil but
may accumulate deep within.may accumulate deep within.
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