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Flushing the hot water coil prior to start up is
required to remove any residual material from the
installation or manufacturing processes as well
as remove any air from the system.
A bleed valve comes standard on all air handlers
with factory installed circulating pumps. If using
an external circulating pump, please use an
external purge valve or other mechanism to flush
hot water coil after installation. Take precautions
while flushing the air handler to keep the multi-
function control board and other electrical
components from getting wet. Hot water is
preferred for flushing.
Follow the flushing steps listed below. Use a
bucket or hose to dispose of water from the bleed
valve during flushing.
1. Flush the return line by closing the inlet valve
(supply) and opening the outlet valve (return).
Open the bleed valve. Close the bleed valve
when flushing is complete.
2. Flush the supply line and coil by closing the
outlet valve (return) and opening the inlet
valve (supply). Open the bleed valve. Close
the bleed valve when flushing complete.
3. Apply power to the air handler. Open inlet
and outlet valves. Engage pump and open
bleed valve. Verify proper flow direction—
inlet should become warm before outlet.
Close the bleed valve when flushing is
complete.
4. Operate pump for five minutes immediately
after flushing system to purge remaining air
from the pump bearing chamber.
CAUTION
•
Follow piping manufacturer's
requirements for any additional required
flushing or cleaning of coil and piping if
using non-copper piping.
•
Do not engage pump until the flushing
process is completed. Running pump dry
will cause damage.
Hydronic Air Handler Installation and Operation Manual
The following conditions must be met prior to starting
the air handler. Refer to outdoor condensing unit
installation instructions for system start-up instructions
and refrigerant charging instructions.
Is unit properly located, secure, and
serviceable?
Is the unit elevated when installed in a garage
or where flammable vapers may be present?
Is the unit protected from vehicular or other
physical damage?
Is the return air 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?
Does the air handler and evaporator coil exhibit
a ¾ in. pitch in the horizontal position towards
the drain pan to ensure proper condensate
drainage?
Has an auxiliary pan been provided under the
unit with separate drain for units installed above
a finished ceiling or in any installation where
condensate overflows could cause damage?
Auxiliary drain is installed when necessary and
pitched to allow for draining?
Has the drain pan and drain tubing been leak
checked?
Have all webs been removed from the drain
connections that are being used? Have all drain
pan plugs not used been properly plugged?
Has the condensate line been properly sized,
run, trapped, pitched, and tested?
Is the ductwork correctly sized, run, taped, and
insulated?
Have all cabinet openings and wiring been
sealed?
Is the indoor coil orifice size correct?
Have all unused orifice replacement parts and
packaging been disposed of or recycled?
Is the filter clean, in place, and of adequate
size?
Are all electrical connections properly sized and
tightened?
Is the wiring neat, correct, and in accordance
with the wiring diagram?
Is the unit properly grounded and protected
(fused)?
Is the thermostat correctly wired and in a good
location?
Are all access panels in place and secure? For
air tight application, neoprene gasket must be
positioned at prescribed locations to achieve
2% leakage.
Check Blower Operation: Set the thermostat
to "FAN ON." Does the indoor blower turn on?
Continued on next page
39
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