Frick AGHN - Operation; Pre Start-Up; Start-Up; Post Start-Up

610.020-IOM (NOV 19)
Page 6
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
Operation
PRE START-UP
• Check all electrical and refrigerant connections.
• Ensure unit voltage as indicated on the nameplate
matches supply voltage.
• Conrm that the air cooler is wired in accordance with
all applicable local and national standards.
• Ensure the unit is securely mounted and fastened at the
hanger points and the unit is level.
• Conrm all fasteners for fans and motors are tight.
• Ensure that all service valves for liquid supply, suction,
and hot gas feed lines are open.
• Conrm proper drainage of condensate from the drain
pan.
• Check operation of condensate drain heaters.
START-UP
• Check all screwed connections, especially at moveable
parts.
• Check tube connections. Make sure that brackets are in
place and connection screws are secured.
• Check electrical connections of motors, heater ele-
ments, and any additional components, if applicable.
• Run the fans and check the direction of rotation. Make
sure that there is no transport damage.
• Properly purge the system of all air, evacuating Freon
and ammonia units.
• During the test run, observe the equipment and check
the following:
- Silent operation of the fans (bearings, contacts, bal-
ance)
- Power requirements of electrical motors
- Leakages
- For direct expansion applications, check superheat
- After 48 hours of operation, recheck the equipment,
specically all rotating parts.
POST START-UP
• Conrm the correct rotation of all impellers.
• High moisture load in new rooms can lead to rapid frost
accumulation on the nned surface. It may be necessary
to initiate a manual defrost.
• Conrm that the air unit has the correct refrigerant
charge.
• Pull down after start up may result in higher than normal
suction pressure, which could cause nuisance tripping of
compressor overloads.
• Check drain pan for proper drainage.
• Check thermostatic expansion valves for proper super-
heat settings.
• Adjust all adjustable controls and valves in the eld to
meet required operating conditions.
Electrical wiring
FIELD WIRING
WARNING
All wiring must be undertaken by qualied personnel
in accordance with national and local electrical codes
and standards.
NOTICE
All wiring must be in accordance with all local and
national codes.
NOTICE
Refer to the submittal documentation and unit name-
plate for voltage information.
NOTICE
Electrical drawings indicate "nameplate" amps. Oper-
ating motor amps can be found on submittal drawing.
Before wiring the equipment, conrm that the electrical
supply is in accordance with the electrical information on
the unit nameplate and unit wiring schematics shipped with
the unit. All electrical components such as circuit breakers,
branch circuit protection, contactors, overload relays, and
wire sizing must be in accordance with national and local
electrical codes and standards. The wiring schematics
shipped with the unit provide the design motor amps and
protection ratings required for branch circuit protection,
disconnects (fused or non-fused) and thermal overload
relays.
Motor protection and supply wire sizing must be suffi-
ciently sized to accommodate the increase in motor amp
draw due to lower temperatures and increased air density.
See Table 2.
Table 2: Motor amperage correction factor vs.
room temperature
Room
temperature
°F
40 30 20 10 0 -10 -20 -30 -40
Amperage
correction
factor
1.06 1.09 1.11 1.13 1.15 1.18 1.21 1.24 1.27
Before operating the unit check all wiring connections,
including factory terminals, because these could vibrate
loose during shipment.
Units are shipped with each of the motors wired to a ter-
minal strip within a common junction box – unless other-
wise requested. It is the installing contractor’s responsibil-
ity to provide the power supply wiring to the unit terminal
block or disconnect switch option.