Daikin AWSF18SU16 Series Manuale di istruzioni per l'installazione - Pagina 6
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NOTE: The use of a heat shield when brazing is recom-
mended to avoid burning the serial plate or the finish
on the unit. Heat trap or wet rags should be used to
protect heat sensitive components such as service
valves and TXV valves.
7.4 Electrical Connections – Supply Voltage
FIRE HAZARD!
TO AVOID THE RISK OF PROPERTY DAMAGE, PERSONAL INJU-
RY OR FIRE, USE ONLY COPPER CONDUCTORS.
IMPORTANT NOTE: Use copper conductors only from
disconnect or electrical panel to the air handler.
A knockout is provided on the air handler top panel or side
to allow for the entry of the supply voltage conductors. If
the knockouts on the cabinet sides are used for electrical
conduit, an adapter ring must be used in order to meet
safety requirements. An NEC or CEC approved strain relief
is to be used at this entry point. The wire is to be sized in
accordance with the "Electrical Wire and MOP" section
of this manual. Some areas require the supply wire to be
enclosed in conduit. Consult your local codes.
Top of Cabinet
Knock-out for Electrical Connections
7.5 Fresh Air Openings
All AWSF/AWST models include 4" fresh air knockouts
on both sides of the cabinet. To utilize, simply remove the
appropriate knockout and connect fresh air inlet venting
directly to cabinet. Ensure the unit mounting system does
not block the fresh air inlet holes.
NOTE: The installing contractor must take into account
any lost capacity due to the the fresh air openings
when sizing the equipment.
CAUTION
Figure 1
8 ACHIEVING LOW AIR LEAKAGE RATE
Ensure all the gaskets remain intact on surfaces as
shipped with the unit. When these requirements are
satisfied, the unit achieves the following airflow leakage
when tested in accordance with ASHRAE Standard 193:
- Cabinet air leakage less than 2% at 1.0 inch H2O
- Cabinet air leakage less than 1.4% at 0.5 inch H2O
9 START-UP PROCEDURE
High Voltage!
Disconnect all power before servicing
or installing this unit. Multiple power
sources may be present. Failure to do
so may cause property damage, personal
injury or death.
• Prior to start-up, ensure that all electrical wires are
properly sized and all connections are properly
tightened.
• All panels must be place and secured. For Air Tight
application, gasket must be positioned at prescribed
locations to achieve 1.4% leakage.
• Tubing must be leak free.
• Condensate line must be trapped and pitched to allow
for drainage.
• Low voltage wiring is properly connected.
• Unit is protected from vehicular or other physical
damage.
• Return air is not obtained from areas where there may
be objectionable odors, flammable vapors or products
of combustion such as carbon monoxide (CO), which
may cause serious personal injury or death.
10 AWST-FACTORY INSTALLED TXV
MODELS
AWST air handlers come equipped with a factory installed
fully adjustable TXV, follow instruction below for installation
procedure.
10.1 Tubing Size
For the correct tubing size, follow the specification for the
condenser/heat pump.
10.2 Tubing Connections
An adjustable TXV with bulb is installed on the vapor tube
from the factory.
Note: The TXV must be adjustable to meet the outdoor
unit's target superheat value. During the superheat
adjustment on the TXV, the torque applied on the nut
cannot exceed 25 in-lbs. Refer to the EXPANSION
VALVE TROUBLESHOOTING section of this manual for
assistance with the adjustable TXV.
6
WARNING