Maintenance and Service
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IM 926-3 • ROOFPAK APPLIED SYSTEMS
Disconnect Switch
DANGER
Hazardous voltage. Will cause severe injury or death.
Disconnect electric power before servicing equipment. More
than one disconnect may be required to de-energize the unit.
WARNING
Molded case switches do not provide over-current protection.
This device may automatically open the circuit at levels above
the ampere rating of the switch.
The optional disconnect is a “through-the-door” molded case
switch with similar features of the circuit breaker. The “through-
the-door” feature provides a safety interlock that disables
power when an inexperienced person opens the control panel
door. This is not the normal recommended method to access
the control panel or to disable power to an operating unit.
Depending on the desired operating state of the unit, four
different recommended methods can be utilized to access the
control panel or to disable power.
1. Recommended method to access the controls through
the “release” method (defeats the mechanical interlock
and allows the control panel door to open without
disconnecting power - switch is in the power “ON”
position):
a. Obtain a small standard head screwdriver.
b.
Insert the head of the screwdriver into the slotted
“release” located on the right hand side of the
disconnect faceplate (
). Turn the release
counter-clockwise.
c.
Pull open the door after the mechanical interlock
is released.
2. Recommended normal method to turn OFF an operating
unit (no emergency condition present):
a.
Follow the “release” method described above.
b. Use the pump down switch to turn OFF the unit.
c. The controls will then shut the liquid line solenoids,
pump the refrigerant into the condenser, and turn
OFF the compressors.
3.
Recommended method to “lock off” power while the
disconnect is OFF:
a.
Rotate the handle to the “Reset Lock” position.
b.
Manually push in the lockout mechanism into the
slot on the faceplate.
c. Insert a padlock into the lockout hole located on
the disconnect handle.
d. Test rotate the handle to insure that power
“lockout” is provided.
4.
Recommended normal method to “restore” power to a
unit that is locked out:
a.
Unlock and remove the padlock when it is safe
(doors are shut, no personnel are within reach of
the condensing unit or are inside the air handler).
b. Shut the control panel door and ensure the
interlock mechanism is operable.
c.
Rotate the handle to the “ON” position.
Figure 129: Through-the-Door Handle Disconnect
Summary of Contents for RoofPak RCS Series
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