96
McQuay IM 987
Check, Test, and Start Procedures
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, or
complete the
"Rooftop Equipment Warranty Regist. Form"‚
page 118
and return it to McQuay International.
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 113
for
instructions.
Servicing Control Panel Components
Disconnect all electric power to the unit when servicing
control panel components. Unless power is disconnected to the
unit, the components are energized. 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 unit controls are included.
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.
b
Furnace Control Compartment
– Turn furnace switch S3 to OFF.
– Main Control Panel Switch
S7 to OFF.
18
If the DAC or SCC unit does not have an optional zone
temperature sensor (ZNT1) connected to it, you may
need to change the keypad entry under
Setup/Service \
Unit Configuration \ Space Sensor=
from YES to NO.
Note:
If desired, you can significantly reduce all MicroTech III
internal control timers by the changing the entry under
keypad menu
Setup/Service\Unit Configuration\Timer
Settings\Service=
from
0 min
to
X min
where X is the
number of minutes you want the unit to operate with fast
timers.
Power Up
1
Close the unit disconnect switch. With the control system
switch S1 in the OFF position, power should be available
only to the control circuit transformer (T1).
2
Turn the Switch S1 to ON. Power should now be
supplied to the control panel, and the LEDs on MCB1
should follow the normal startup sequence (refer to
"Power-up"‚ page 55
).
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 III Applied Rooftop
Unit Controller” (OM 920) 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.
