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General
WARNING
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 .
WARNING
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 .
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 Daikin Applied .
NOTE: Before opening service panels, always lock out and
tag out the power disconnect switch .
Pre-Start Up
WARNING
Unit cannot be started until the ductwork is installed to avoid
injury
1 . Check that the unit is completely and properly installed
with ductwork connected .
2 .
Check that all construction debris is removed and filters
are clean .
3 . With all electrical disconnects open, check all electrical
connections to be sure they are tight . Although all factory
connections are tight before shipment, shipping vibration
can cause loosening .
4 . Check all compressor valve connections for tightness
to avoid refrigerant loss at Start Up . Although all factory
connections are tight before shipment, shipping vibration
can cause loosening . See
Table 11
for proper valve
torque values .
5 . Check the tightness of setscrews in bearings, drives,
and fan wheels . If retightening is needed, make certain
the fan wheel is centered and setscrews are torqued per
Table 12
.
6 . Check that the fan rotates freely . Check belt tension and
alignment .
7a. Check all factory- and field-installed Victaulic coupling
connections for tightness to avoid water leaks . Although
all factory connections are tight before shipment,
shipping vibration can loosening .
7b . Check that the unit condenser drains were made .
8 . Before attempting to operate the unit, review the control
layout description to become familiar with the control
locations .
9 . Review all equipment service literature and the unit
wiring diagrams supplied with each unit .
10 . Review optional controls to determine which are included
in the unit .
11 . Check that the return air temperature sensor and
optional space temperature sensor, if used, are installed
in the return air duct and that the wiring terminations
were made at the unit input board .
12 . Check that the entering water temperature sensor is
mounted .
13 . Check 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, or
two, SPS1 and SPS2 .
14 . Check the voltage of the unit power supply and see that
it is within the allowed ±10% tolerance . Phase voltage
unbalance must be within ±2% .
15 . Check the unit power supply wiring for adequate
ampacity and a minimum insulation rating of 75°C .
16 . Verify that all mechanical and electrical inspections were
completed per local codes .
CAUTION
Compressor and refrigerant valves are closed for shipment
17 . Open the compressor suction and discharge shutoff
valves and liquid line shutoff valves until back-seated .
Always replace valve seal caps .
18 . Make sure the unit switch S7 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 11: Valve Torques
Coupling nut size
(in)
Gage port cap
torque (lbs-ft)
Stem cap
torque (lbs-ft)
Coupling nut
torque (lbs-ft)
1 .00
7±1
32±2
55+5
1 .25
7±1
32±2
90+10
1 .75
7±1
45±3
205+15
Table 12: Setscrew Torque
Setscrew diameter
Torque min . (ft .-lbs .)
#10
4 .3
1/4"
10 .0
5/16"
20 .0
3/8"
25 .0
IM 1032-2 • Self-Contained Air Conditioning System 34 www .DaikinApplied .com
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