12
12.4 Electrical Connections – Supply Voltage
IMPORTANT NOTE:
USE COPPER CONDUCTORS ONLY.
Knockouts are provided on the air handler top panel and
sides of the cabinet to allow for the entry of the supply voltage
conductors, as shown in Figure 13. If the knockouts on the
cabinet sides are used for electrical conduit, an adapter ring
must be used in order to meet UL1995 safety requirements. An
NEC or CEC approved strain relief is to be used at this entry
point. Some codes/municipalities require the supply wire to be
enclosed in conduit. Consult your local codes.
Side of
Cabinet
Top of
Cabinet
KNOCK-OUT FOR ELECTRICAL CONNECTIONS
Figure 13
12.4.1 Air Handler Only (Non-Heat Kit Models)
The power supply connects to the stripped black and red wires
contained in the air handler electrical compartment. Attach the
supply wires to the air handler conductors as shown in the unit
wiring diagram using appropriately sized solderless connectors
or other NEC or CEC approved means. A ground lug is also
provided in the electrical compartment. The ground wire from
the power supply must be connected to this ground lug.
12.4.2 Air Handler - Non-Circuit Breaker Heat Kits
A terminal block is provided with the HKS kit to attach the power
supply and air handler connections. Follow the HKS Installation
Manual and wiring diagram for complete wiring details.
12.4.3 Air Handler With Circuit Breaker Heat Kit
The air handler has a soft plastic cover on the upper access
panel and can be removed to allow the heater kit circuit breaker
to be installed. The circuit breakers have lugs for power supply
connection. See the HKS Installation Instructions for further
details.
12.5 Low Voltage Connections
Several combinations of low voltage schemes are possible,
depending on the presence of a heat kit and whether the
heat kit is single-stage or multi-stage, whether the outdoor
section is an air conditioner or heat pump, and whether the
system is setup with a communicating or traditional thermostat.
The 24V-control voltage connects the air handler to the
room thermostat and condenser. Low voltage wiring must
be copper conductors. A minimum of 18 AWG wire must be
used in installations up to 100’. Low voltage wiring must be
connected through the top of the cabinet or either side. See
the “Thermostat Wiring” section of this manual for typical low
voltage wiring connections.
13 Achieving 1.4% and 2.0% Airflow Low Leakage
Rate
Ensure all the gaskets remain intact on all surfaces as shipped
with the unit. These surfaces are areas between the upper tie
plate and coil access panel, blower access and coil access
panels, and between the coil access and filter access panels.
Ensure upon installation, that the plastic breaker cover is sitting
flush on the blower access panel and all access panels are
flush with each other and the cabinet. With these requirements
satisfied, the unit achieves less than 1.4% airflow leakage at 0.5
inch wc static pressure and less than 2% airflow leakage a 1inch
wc static pressure when tested in accordance with ASHRAE
Standard 193.
14 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 in place and secured. For Air Tight
application, gasket must be positioned at prescribed
locations to achieve low airflow as stated in section 13.
• Tubing must be leak free.
• Condensate line must be trapped and pitched to allow for
drainage.
• Low voltage wiring is properly connected.
• Auxiliary drain is installed when necessary and pitched to
allow for drainage.
• Unit is protected from vehicular or other physical damage.
• Return air is not obtained from, nor are there any return
air duct joints that are unsealed in, 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.
15 Regular Maintenance
The only item required to be maintained on a regular basis by
the user is the circulating air filter(s). Filter should be cleaned or
replaced regularly, typically once per month. A certified service
technician must perform all other services.
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.
IMPORTANT NOTE:
If thumb screws are used to access the filter,
ensure the washer installed on the screw behind the access panel
remains in place after re-installation.
