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B
For EconoMi$er
IV operation,
there must be a thermostat
call for
the fan (G). This will move the damper
to its minimum
position.
When the EconoMi$er
IV control
is in the occupied
mode
and a
call for cooling
exists (YI on the thermostat),
the control
will first
check
for indoor
fan operation.
If the fan is not on, then cooling
will not be activated.
If the fan is on, then the control will open the
EconoMi$er
IV damper
to the minimum
position.
On the initial power
to the EconoMi$er
IV control,
it will take the
damper
up to 21/2 minutes
before
it begins
to position
itself. Any
change
in damper
position
will take up to 30 seconds
to initiate.
Damper
movement
from full closed to full open (or vice versa) will
take between
11/2 to 21/2 minutes.
If free cooling
can be used
as determined
from
the appropriate
changeover
command
(switch,
dry
bulb,
enthalpy
curve,
differential
dry bulb,
or differential
enthalpy),
then the control will
modulate
the
dampers
open
to
maintain
the
mixed
air
temperature set point at 50 ° to 55°F.
If there is a further
demand
for cooling
(cooling
second
stage - Y2
is energized),
then the control
will bring on compressor
stage
1 to
maintain
the mixed
air temperature
set point. The EconoMi$er
IV
damper
will
be
open
at maximum
position.
EconoMi$er
IV
operation
is limited to a single compressor.
Heating_ Units With EconoMi$er
IV
When the room temperature
calls for heat, the heating
controls
are
energized
as described
in the Heating,
Units Without
Economizer
section.
The IFM
is energized
and the EconoMi$er
IV damper
modulates
to the
minimum
position.
When
the
thermostat
is
satisfied,
the damper
modulates
closed.
SERVICE
ELECTRICALSHOCK
HAZARD
Failure
to follow
this warning
could
result
in personal
iniury or death.
Before
performing
service
or maintenance
operations
on
unit, turn off main power
switch to unit.
Remove
Surface
Loaded
Fibers
Surface
loaded
fibers or dirt should
be removed
with
a vacuum
cleaner.
If a vacuum cleaner is not available,
a soft non-metallic
bristle brush
may be used. In either case, the tool should be applied
in the direction
of the fins. Coil surfaces
can be easily damaged
(fin
edges
can be easily
bent
over
and damage
to the coating
of a
protected
coil) if the tool is applied across the fins.
NOTE:
Use of a water
stream,
such as a garden
hose,
against a
surface
loaded coil will drive the fibers and dirt into the coil. This
will make
cleaning
efforts
more
difficult.
Surface
loaded
fibers
must
be completely
removed
prior
to using
low velocity
clean
water rinse.
Periodic
Clean
Water Rinse
A periodic
clean water
rinse
is very beneficial
for coils that are
applied in coastal
or industrial
environments.
However,
it is very
important
that the water rinse is made with very low velocity
water
stream
to avoid
damaging
the fin edges.
Monthly
cleaning
as
described
below
is recommended.
Routine
Cleaning
of MicroChannel
Condenser
Coil Surfaces
To clean the MicroChannel
condenser
coil, chemicals
are NOT to
be used;
only water
is approved
as the cleaning
solution.
Only
clean
portable
water
is authorized
for
cleaning
Microchannel
condensers.
Carefully
remove
any
foreign
objects
or debris
attached
to the coil face or trapped
within
the mounting
frame and
brackets.
Using
a high
pressure
water
sprayer,
purge
any soap or
industrial
cleaners
from hose and/or
dilution
tank prior
to wetting
the coil.
Clean
condenser
face
by
spraying
the
coil
core
steadily
and
uniformly
from top to bottom
directing
the spray
straight
into or
toward
the coil face.
Do not exceed
900 psig or a 45 degree angle;
nozzle
must
be at least 12" (30 cm) from
the coil face.
Reduce
pressure
and use caution
to prevent
damage
to air centers
(fins).
Do not fracture
the braze between
air centers and refrigerant
tubes.
Allow
water to drain from
the coil core and check
for refrigerant
leaks prior to start-up.
NOTE:
Please
see the MicroChannel
Condenser
Service
section
for specific
information
on the microchannel
coil.
[]NIT
OPERATION
AND SAFETY
HAZARD
Failure
to follow
this caution
may result in personal
iniury
or equipment
damage.
Puron ® (R-410A)
refrigerant
systems
operate
at higher
pressures
than
standard
R-22
systems.
Do not use R-22
service
equipment
or components
on
Puron
refrigerant
equipment.
Cleaning
Inspect
unit
interior
at beginning
of each
heating
and cooling
season and as operating
conditions
require.
Remove
unit top panel
and/or side panels for access to unit interior.
Coil Maintenance and Cleaning Recommendation
Routine
cleaning
of coil surfaces
is essential
to maintain
proper
operation
of the unit. Elimination
of contamination
and removal
of
harmful
residues
will greatly increase
the life of the coil and extend
the life
of the unit.
The
following
maintenance
and cleaning
procedures
are recommended
as part of the routine
maintenance
activities
to extend the life of the coil.
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury or
equipment damage.
Chemical cleaning should NOT be used on the aluminum
microchannel condenser. Damage to the coil may occur. Only
approved cleaning is recommended.
Routine
Cleaning
of Evaporator
Coil Surfaces
Monthly
cleaning
with
Totaline®
environmentally
sound
coil
cleaner
is essential
to extend
the
life of coils.
This
cleaner
is
available
from
Carrier
Replacement
parts division
as part number
P902-0301
for
a
one
gallon
container,
and
part
number
P902-0305
for
a 5 gallon
container.
It is recommended
that
round-tube
coils,
including
standard
aluminum,
pre-coated,
copper/copper
or E-coated
coils
be
cleaned
with
the
Totaline
environmentally
sound
coil
cleaner
as described
below.
Coil
cleaning
should
be
part
of
the
unit's
regularly
scheduled
maintenance
procedures
to ensure
long
life of the coil. Failure
to
clean the coils may result in reduced
durability
in the environment.
Avoid
the use of:
• coil brighteners
• acid cleaning
prior to painting
• high pressure
washers
• poor quality
water for cleaning
34
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