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4 | Piping
5.
Make all necessary electrical connections to the unit.
Refer to the unit wiring diagram and the Electrical
section of this manual.
CAUTION: When making electrical
connections to the unit make sure that the
power is disconnected. Failure to do
disconnect power before connecting power
wiring to the unit can result in serious injury or
death and damage to the unit.
6.
Make sure the unit's washable filter is clean and
installed in the sub base. Also make sure that the
filter clip is in place.
7.
Reinstall the unit cabinet via locating pins at the top
of the chassis and two screws in the unit sub base.
PIPING:
SUPPLY AND RETURN PIPING:
The following items should be adhered to in addition to
applicable piping codes.
•
A drain valve at the base of each riser to enable
proper flushing of the system at startup and during
servicing.
•
Shut-off/Isolation ball valves at the supply and return
connections and unions at each unit to permit proper
flow balancing and unit servicing.
•
Strainers at the inlet of each circulating pump.
•
Use of teflon tape on threaded pipe fittings to
eliminate water leaks and insure against air entering
the system.
•
Flexible hose connections between the unit and the
rigid system to eliminate the possibility of vibration
transmission through the piping.
•
Insulation is not normally required on supply and
return piping for boiler tower installations except in
unheated sections or outdoor runs.
•
Insulation is required for closed-loop geo-thermal
installations as loop temperatures may fall below the
dew point and can even fall below the freezing point
of water during heating season.
CONDENSATE PIPING:
Console units are designed with a blow-through
configuration in the air handling section. This means that
there is positive pressure at the unit drain pan and thus
trapping is not required. Condensate is routed from the
drain pan via a 5/8" non-pressure rated vinyl hose that is
located below the supply and return water connections.
Though horizontal runs of condensate piping are usually
too short to pose problems, horizontal runs should be
pitched at least 1 inch for every 10 feet of piping. Avoid
low spots or unpitched piping, as these areas can collect
sediment and eventually block condensate flow.
970-293 (2014/06)
Always inspect both internal and external condensate
piping for kinks that could block condensate flow.
HOSE KITS:
When using optional hose kits follow the manufacturer's
recommendations for installation. Never stretch or twist
hoses and never use hoses that show external wear or
damage or are suspected of having damage. Never
exceed the manufacturer's maximum working pressure
recommendations.
ELECTRICAL:
Caution
Field wiring must comply with local and national fire,
safety and electrical codes. Power to the unit must be
within the operating voltage range indicated on the unit
chassis nameplate or the performance data sheet.
Properly sized fuses or HACR breakers must be installed
for branch circuit protection. See unit chassis name plate
for maximum size.
Each chassis is supplied with a 2 x 4 junction box for
power connection. Inside this box there are 2 pigtail
leads for power wiring. The field ground is to be
connected to the ground connection on the junction box.
On remote thermostat and master/slave units there are
also 5 position terminal blocks for low voltage thermostat
or slave unit connection. On remote thermostat units,
connect the thermostat wires to the low voltage terminal
block. On master/slave units connect the thermostat to
the "Master " terminal block of the lead unit and the
"Slave" terminal block to the "Master " terminal block of
the next unit, daisy chaining the units together as
required. Note that there is no limit to the number of
units that can be connected together in this manner as
each unit provides it's own low voltage power supply.
Caution
COOLING TOWER/BOILER
APPLICATIONS:
The cooling tower and boiler water loop temperature is
usually maintained between 50°F and 100°F to assure
adequate cooling and heating performance.
In the cooling mode, heat is rejected from the console
unit into the water loop. A cooling tower provides
evaporative cooling to the loop water thus maintaining a
constant supply water temperature to the unit. When
Subject to change without prior notice
CAUTION: Use only copper conductors for
field installed electrical wiring. Always make
sure that the power disconnect is open before
per forming service on the unit's electrical
circuits.
NOTE: All 208/230 volt (-1 voltage code) units
are factory wired to 230 volts unless ordered
other wise. In 208 voltage applications the
transformer wiring may need to be switched
from the 230 volt tap to the 208 volt tap. Cap
all unused leads.
Console Model
CA Series
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