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

System Check, Test, and Start

System Check, Test, and Start
ELECTRIC SHOCK HAZARD
The equipment frame must be bonded to the building electrical
ground with the grounding terminal provided or other
acceptable means. Failure to properly ground can result in
electric shock, equipment damage, severe personal injury, or
death. Lock out and tag out all power sources to equipment
before servicing.
Always open the power disconnect switch before opening
service panels. Failure to do so can result in electric shock,
equipment damage, severe personal injury, or death.

General

Start-up and service of this equipment must be performed only
by trained, experienced personnel. A representative of the
owner or the operator should be present during start-up to
receive instruction in unit operation, care, and adjustment.
Complete 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.
Before opening service panels, always lock out and tag
Note:
out the power disconnect switch.

Pre Start-Up

Check that the unit is completely and properly installed
1
with ductwork connected.
Check that all construction debris is removed and filters are
2
clean.
With all electrical disconnects open, check all electrical
3
connections to be sure they are tight. Although all factory
connections are tight before shipment, shipping vibration
can cause loosening.
Check all compressor valve connections for tightness to
4
avoid refrigerant loss at start-up. Although all factory
connections are tight before shipment, shipping vibration
can cause loosening. See Table 13 for proper valve torque
values.
Check the tightness of setscrews in bearings, drives, and
5
fan wheels. If retightening is needed, make certain fan
wheels are centered between the inlet openings and
setscrews are torqued per Table 14.
Check that the fan rotates freely. Check belt tension and
6
alignment.
40
WARNING
WARNING
Check that the unit condenser water connections and
7
condensate drain connections were made.
Before attempting to operate the unit, review the control
8
layout description to become familiar with the control
locations.
Review all equipment service literature and the unit wiring
9
diagrams supplied with each unit.
Review optional controls to determine which are included
10
in the unit.
Check that the return air temperature sensor (and optional
11
room sensor) is installed in the return air duct and that the
wiring terminations were made at the unit input board.
Check that entering and leaving condenser water
12
temperature sensors are mounted.
Check that the optional duct static pressure sensor is
13
connected to the duct with appropriate tubing. The unit may
have one optional static pressure sensor, SPS1. The other
option would be SPS1 and SPS2.
Check the voltage of the unit power supply and see that it is
14
within the allowed ±10% tolerance. Phase voltage
unbalance must be within ±2%.
Check the unit power supply wiring for adequate ampacity
15
and a minimum insulation rating of 75°C.
Verify that all mechanical and electrical inspections were
16
completed per local codes.
Open all liquid line service valves and tighten all packing
17
nuts
Open the compressor suction and discharge shutoff valves
18
until backseated. Always replace valve seal caps.
For units with compressor crankcase heaters: Make sure the
19
unit switch S1 is in the OFF position. Then throw the main
power disconnect to ON. This energizes the crankcase
heaters. Wait a minimum of 24 hours before starting the
unit.
Table 13: Valve Torques
Coupling nut Gage port cap
size (in) torque (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"
Stem cap torque Coupling nut
(lbs-ft) torque (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
McQuay IM 937