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DUCT
SYSTEM
A supply air outlet collar and return air duct flange are provided
on
all units
to facilitate
duct
connections.
Refer
to the individual
Product
Data for physical
dimensions
of collar and flange.
NOTE:
Supply
air duct and return
air duct flanges
are shipped
unfolded
with unit.
A flexible
connector
is recommended
for supply and return air duct
connections
on metal
duct systems.
All metal
ducting
should
be
insulated
with a minimum
of one inch duct insulation
to avoid heat
loss or gain
and prevent
condensate
from
forming
during
the
cooling
operation.
Application
of
the
unit
to
uninsulated
duct
work
is
not
recommended
as the unit's performance
will be adversely
affected.
UNIT OPERATION
HAZARD
Failure
to follow
this caution
may
result
in improper
equipment
operation.
Do
not connect
discharge
ducts
directly
to the
blower
outlet.
The factory provided
air filter must be removed
when using a filter
back return
air grill. The factory
filter should
be left in place on a
free return system.
If the unit will be installed
in a new installation
which
includes
new
duct
work,
the
installation
should
be
designed
using
current
ASHRAE
procedures
for duct sizing.
If the unit is to be connected
to existing
duct work,
a check should
be made
to assure
that the duct system
has the capacity
to handle
the air required
for the unit application.
If the duct system
is too small, larger duct work should
be installed.
Check for existing
leaks and repair.
The duct system
and all diffusers
should
be sized to handle
the
designed
air flow quietly.
To maximize
sound
attenuation
of the
unit blower,
the supply
and return air plenums
should be insulated.
There
should
be no direct
straight
air path through
the return air
grille into the heat pump. The return air inlet to the heat pump must
have at least one 90 degree
turn
away from
the space
return
air
grille.
If air noise or excessive
air flow are a problem,
the blower
speed can be changed
to a lower speed to reduce air flow.
Refer to
Table 2 for ECM motor speeds and settings.
UNIT OPERATION
AND SAFETY
HAZARD
Failure to follow
this warning
could
result in personal
iniury
and/or death as well as equipment
damage.
Always
disconnect
power
to the unit before
changing
motor
speed to prevent
electrical
shock and/or damage to the motor.
PIPING
Supply
and return piping
must be as large as the unit connections
on the heat pump (larger on long runs).
UNIT OPERATION
HAZARD
Failure to follow this caution may result in improper
equipment operation.
Never use flexible hoses of a smaller inside diameter than
that of the fluid connections on the unit.
GB units are supplied
with either a copper
or optional
cupronickel
condenser.
Copper
is adequate
for ground
water
that is not high in
mineral
content.
NOTE:
Proper
testing
is recommended
to assure
the well water
quality
is suitable
for use with water
source
equipment.
When in
doubt,
use cupronickel.
In conditions
anticipating
moderate
scale formation
or in brackish
water, a cupronickel
heat exchanger
is recommended.
Both the supply and discharge
water lines will sweat if subjected
to
low water temperature.
These
lines should
be insulated
to prevent
damage
from condensation.
All manual
flow valves
used in the system
must
be ball valves.
Globe and gate valves must not be used due to high pressure
drop
and poor throttling
characteristics.
EQUIPMENT
DAMAGE
OPERATION
HAZARD
AND/OR
UNIT
Failure to follow this caution may result in equipment
damage and/or improper operation.
Never exceed the recommended water flow rates as serious
damage
or erosion
of the water-to-refrigerant
heat
exchanger could occur.
Improper heat exchanger water flow due to piping, valve
arrangement or improper pump operation is hazardous to
the unit and constitutes abuse which will void the heat
exchanger and compressor warranty.
Always check carefully for water leaks and repair appropriately.
[]nits are equipped
with female pipe thread fittings. Consult
Product Data for sizes.
NOTE:
Teflon tape sealer should be used when connecting water
piping connections to the units to insure against leaks and possible
heat exchanger fouling.
Flexible hoses should be used between the unit and the rigid
system to avoid possible vibration. Ball valves should be installed
in the supply and return lines for unit isolation and unit water flow
balancing.
No unit should be connected to the supply or return piping until
the water system has been completely
cleaned and flushed to
remove any dirt, piping chips or other foreign material. Supply and
return hoses should be connected together during this process to
ensure the entire system is properly flushed. After the cleaning and
flushing has taken place the unit may be connected to the water
loop and should have all valves wide open. Do not over-tighten
connections.
Table 2 - GB Motor
CFM
Selection
(Constant
Torque
ECM
Motor)
GB018
1/3
MED
....
-
GB024
1/3
'
::;:
MED
'
2
,
GB030
1/3
MED
....
-
GB036
3/4
MED
.....
GB042
'
3/4
MED
-
G B048
3/4
_W
M ED
_
GB060
1
MED
2
:
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