System Check, Test And Start; General; Pre Start-Up; Start-Up - McQuay SWP 018 Installation And Maintenance Manual

System Check, Test and Start

WARNING
Electric shock hazard. Failure to bond the
frame of this equipment to the building elec-
trical ground by use of the grounding termi-
nal provided or other acceptable means may
result in electric shock. Disconnect electric
power before servicing equipment.

General

Only qualified personnel should perform the start-up and
service of this equipment. A representative of the owner or
the operator should be present during start-up to receive
instruction in the operation, care and adjustment of the unit.
To assure proper warranty coverage, the unit must be put
through a check, test and start-up procedure. The completed
check test and start form (supplied with each unit) must be
signed and returned to McQuay International.
Note: Always open power disconnect switch before open-
ing service panels.

Pre Start-up

1. Check that the unit is completely and properly installed
with ductwork connected. Check that all construction
debris is removed and filters are clean.
2. With all electrical disconnects open, check all electrical
connections to be sure they are tight. Although all fac-
tory connections are tight before shipment, some loos-
ening may have resulted from shipping vibration.
3. Check all compressor valve connections for tightness to
avoid refrigerant loss at start-up. Although all factory
connections are tight before shipment, some loosening
may have resulted from shipping vibration. Refer to
Table 13 for proper valve torque values.
4. Check tightness of setscrews in bearings, drives, and fan
wheels. If retightening is needed, make certain fan
wheels are centered between the inlet openings and set-
screws are torqued per Table 14.
5. Check that the fan rotates freely. Check belt tension and
alignment.
6. Check that the unit condenser water connections and
condensate drain connections have been made.
7. Before attempting to operate the unit, review the control
layout description to become familiar with the control
locations. Review all equipment service literature and
the unit wiring diagrams supplied with each unit.
Review optional controls to determine which are
included in the unit.
IM708
8. Make sure that the return air temperature sensor and
optional space temperature sensor, if used, have been
installed in the return air duct and that the wiring termi-
nations have been made at the unit Input Board.
9. Make sure that entering and leaving condenser water
temperature sensors are mounted.
10. Make sure that the optional duct static pressure sensor is
connected to the duct with appropriate tubing. The unit
may have one optional static pressure sensor, SPS1. The
other option would be that or SPS1 and SPS2.
11. Check the voltage of the unit power supply and see that
it is within the ±10% tolerance that is allowed. Phase
voltage unbalance must be within ±2%.
12. Check the unit power supply wiring for adequate
ampacity and a minimum insulation rating of 75°C.
13. Verify that all mechanical and electrical inspections
have been completed per local codes.
14. Open the compressor suction and discharge shutoff
valves until backseated. Always replace valve seal caps.
15. The following must be done only for units with 20 hp
compressors. Making sure unit switch S7 is in the
"OFF" position, throw the main power disconnect to
"ON." This will energize the crankcase heaters. Wait a
minimum of 24 hours before starting up the unit.
Table 13. Valve Torques
COUPLING GAGE PORT
NUT SIZE CAP TORQUE
INCH LBS-FT
1.00 7±1
1.25 7±1
1.75 7±1
Table 14. Setscrew Torque
SETSCREW DIAMETER
#10
1/4"
5/16"
3/8"

Start-up

General
All units are factory tested to assure proper operation in the
field.
1. Close disconnect switch with switch S7 in the "OFF"
position. Allow crankcase heaters to operate for 24
hours.
2. Power should now be supplied to the MicroTech II con-
troller and the LEDs on MCB1 should follow the nor-
mal startup sequence.
STEM CAP COUPLING
TORQUE NUT TORQUE
LBS-FT LBS-FT
32±2 55+5
32±2 90+10
45±3 205+15
TORQUE MIN. (FT.-LBS.)
4.3
10.0
20.0
25.0
31