System Check, Test And Start; General; Pre Start-Up; Start-Up - McQuay SWT C Series Installation And Maintenance Manual

System Check, Test and Start

WARNING
Electric shock hazard. Failure to ground the
frame of this equipment to the building elec-
trical ground can cause property damage,
severe personal injury or death. Use the
grounding terminal provided or other accept-
able means. Disconnect and tag out all elec-
tric power before servicing equipment.

General

Start-up and service of this equipment must be performed by
trained, experienced personnel only. 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 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 factory
connections are tight before shipment, some loosening may
result from shipping vibration.
3. Check all compressor valve connections for tightness to
avoid refrigerant loss at start-up. Although all factory con-
nections are tight before shipment, some loosening may
result from shipping vibration. Refer to Table 14 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 setscrews are
torqued per Table 15.
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 loca-
tions. 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.
34
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 termina-
tions 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
SPS1, if used, is connected to the duct with appropriate tub-
ing.
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.
Table 14. 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 15. 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.
3. Set internal MicroTech II time clock or external time
clock if used.
4. Set cooling setpoint to a value which will assure a full
call for cooling.
5. Start the auxiliary equipment for the installation such as
water pumps, cooling towers, etc.
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
IM709