Installation manual

IM-487 Page 73
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 prop-
erly start the unit. To obtain full warranty coverage, the
check, test, and start form supplied with the unit must be
completed, signed, and returned to McQuay International.
A representative of the owner or the operator of the equip-
ment should be present during start-up to receive instructions
in the operation, care, and maintenance of the unit.
Before Start-up
1. Verify that the unit is completely and properly installed
with ductwork connected. Verify that all construction
debris is removed, and that the filters are clean.
2. Verify that all electrical work is complete and properly ter-
minated. Verify that all electrical connections in the unit
control panel and compressor terminal box are tight, and
that the proper voltage is connected. Verify all nameplate
electrical data is compatible with the power supply. Verify
the phase voltage imbalance is no greater than 10 %.
3. Verify that gas piping is complete and leak tight. Verify
that the shutoff cock is installed ahead of the furnace, and
that all air has been bled from the gas lines.
4. Manually rotate all fans and verify that they rotate freely.
Verify that the belts are tight and the sheaves are aligned.
5. Verify that all setscrews and fasteners on the fan assem-
blies are still tight. Do this by reading and following the
instructions in "Setscrews" which is in the "Maintenance"
section of this manual.
6. Verify that the evaporator condensate drain is trapped, and
that the drain pan is level.
7. If unit is curb mounted, verify that the curb is properly
flashed to prevent water leakage.
8. Before attempting to operate the unit, review the control layout
description to become familiar with the control locations.
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.
Determine which optional controls are included with the unit.
9. 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. Compressor Compartment
Turn compressor control circuit switches
CS1, CS2 to "off."
Turn liquid line solenoid valve switches
PS1, PS2, PS3 to "off."
c. Furnace Control Compartment
Turn furnace switch S3 to "off."
d. Main Control Panel Switch
S7.
10,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"
11.If desired, all MicroTech II internal control timers can be
reduced significantly by the changing the entry under key-
pad menu Setup/Service \ Unit Configuration \ Timer Set-
tings \ Service = from "0 min" to "X min" where X is the
number of minutes you want to have the unit 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 compressor crankcase heaters.
2. Turn the Switch S1 to "on". Power should now be sup-
plied to the control panel, and the LED's on MCB1 should
follow the normal startup sequence (refer to the "MCB
LED Power-Up Sequence" of IM 696).
Fan Start-up
1. Verify all duct isolation dampers are open. Unit mounted
isolation dampers may be mounted in the supply or
return sections.
2. Place the unit into the "Fan Only" mode through the keypad
menu System Summary \ System \ Ctrl Mode = Fan Only.
3. Turn Switch S7 to "on". The controller should enter the
"Startup Initial" operating state.
4. If the fans are equipped with optional spring isolators,
check the fan spring mount adjustment. When the fans are
running they should be level. Refer to“Spring Isolated
Fans” on page 43.
5. Verify the rotation is correct.
6. Verify the DHL safety is opening at a pressure compatible
with duct working pressure limits.
DANGER
Electric shock and moving machinery hazard. Can
cause severe equipment damage, personal injury,
or death.
Lock out and tag out electrical power before
servicing this equipment.
All start-up and service work must be performed trained,
experienced technicians.
Read and follow this manual: "MicroTech II Applied Roof-
top Unit Controller" manual (Bulletin IM 696), and opera-
tion manual (Bulletin OM 137 or OM 138) before
operating or servicing.
Equipment frame must be bonded to building electrical
ground through grounding terminal or other
approved means.