100
IM 738-2
Check, Test, and Start Procedures:
Servicing Control Panel Components
Check, Test, and Start Procedures
All units are completely run tested at the factory to promote
proper operation in the field. Nevertheless, the following
check, test, and start procedures must be performed to properly
start the unit. To obtain full warranty coverage, complete and
sign the check, test, and start form supplied with the unit and
return it to
Daikin Applied.
A representative of the owner or the operator of the equipment
should be present during start-up to receive instructions in the
operation, care, and maintenance of the unit.
If the unit has a factory mounted disconnect switch, use the
switch’s bypass mechanism to open the main control panel
door without de-energizing the control panel. See page 119 for
instructions.
Whenever accessing the main control panel while it is still
energized, keep the inner deadfront protective panels on to
avoid exposure to high voltage power.
Servicing Control Panel Components
Disconnect all electric power to the unit when servicing
control panel components located behind the protective
deadfront panels. Unless power is disconnected to the unit, the
components behind the protective deadfront panels are
energized with high voltage. Always inspect units for multiple
disconnects to ensure all power is removed from the control
panel and its components before servicing.
Before Start-up
1
Verify that the unit is completely and properly installed
with ductwork connected.
2
Verify that all construction debris is removed, and that the
filters are clean.
3
Verify that all electrical work is complete and properly
terminated.
4
Verify that all electrical connections in the unit control
panel and compressor terminal box are tight, and that the
proper voltage is connected.
5
Verify all nameplate electrical data is compatible with the
power supply.
6
Verify the phase voltage imbalance is no greater than 10%.
7
Verify that gas piping is complete and leak tight.
8
Verify that the shutoff cock is installed ahead of the
furnace, and that all air has been bled from the gas lines.
9
Manually rotate all fans and verify that they rotate freely.
10
Verify that the belts are tight and the sheaves are aligned.
11
Verify that all setscrews and fasteners on the fan assemblies
are still tight. Do this by reading and following the
instructions in “Setscrews,” which is in the “Maintenance”
section of this manual.
12
Verify that the evaporator condensate drain is trapped and
that the drain pan is level.
13
If unit is curb mounted, verify that the curb is properly
flashed to prevent water leakage.
14
Before attempting to operate the unit, review the control
layout description to become familiar with the control
locations.
15
Review the equipment and service literature, the sequences
of operation, and the wiring diagrams to become familiar
with the functions and purposes of the controls and devices.
16
Determine which optional controls are included with the
unit.
17
Before closing (connecting) the power disconnect switch,
open (disconnect) the following unit control circuit
switches:
a
Main Control Panel
– Turn system switch S1 to OFF.
– Electric heat units: turn switch HS1 to OFF.
– Turn compressor control circuit switches
CS1, CS2 to OFF.
– Turn liquid line solenoid valve switches
PS1 and PS2 to OFF.
b
Furnace Control Compartment
– Turn furnace switch S3 to OFF.
– Main Control Panel Switch
S7 to OFF.
WARNING
Electric shock and moving machinery hazard. Can cause
severe equipment damage, personal injury, or death.
Disconnect and tag out all electrical power before servicing this
equipment.
All start-up and service work must be performed only by trained,
experienced technicians familiar with the hazards of working on
this type of equipment.
Read and follow this manual: “MicroTech II Applied Rooftop
Unit Controller” manual (Bulletin IM 696), and operation manual
(Bulletin OM 137 or OM 138) before operating or servicing.
Bond the equipment frame to the building electrical ground
through grounding terminal or other approved means.
WARNING
Hazardous voltage. May cause severe injury or death.
Disconnect electric power before servicing equipment. More
than one disconnect may be required to de-energize the unit.
Summary of Contents for RDT-135c
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