Installation Manual 5.1.2
7
4.0 Ductwork Considerations
Important Note: If ductwork is installed in an attic
area, it needs to be built “low profile” and laid directly
on the ceiling joist. After being installed and insulated
with R6 insulation, it must be covered with six to eight
inches of cellulose. If the attic ductwork is not covered
with cellulose it can lose a significant amount of its
heating and cooling capacity!!
Inadequate ductwork will cause poor system
performance and customer dissatisfaction. In the USA,
ductwork sizing methods should follow ACCA “Manual
D”.
Install ductwork within the conditioned space of the
building to minimize duct heat loss or gain, wherever
possible. To minimize air velocity noise transferring to
the air supply grills, flex duct should be installed from
the supply grill back six feet.
Vstar systems will ramp the compressor as needed to
maintain heating or cooling set point. The CFM
delivered by the system will initially ramp up equal to
400 CFM / ton in heat or 375 CFM / ton in cooling.
After the Vstar system has run for a few minutes the
blower will adjust slightly in an attempt to maintain
discharge air temp set point. Default discharge air set
points are 55ºF in cooling and 100ºF heat.
Ductwork should be designed to handle CFM delivery
for the system while running in High Speed. Supply duct
should be based on .08 inches of pressure drop per 100
feet. Return duct should be based on .05 inches of
pressure drop per 100 feet.
Note: Always check register CFM requirements against
register manufacturer’s data for register performance.
It is extremely important to ensure that duct system
return air is NOT undersized. Undersized return air can
cause poor system performance and in some cases can
cause the blower to “pulse”. Further, it is also
important to provide adequate sized supply air
plenums. Make all turns as smooth as possible avoiding
any restrictions.
For residential design the target static pressure should
not be greater than 0.3”.
Caution: Observe the location where your
ductwork is being attached to the unit. Ensure
that drilling and screws do not damage the air coil.
4.1 Hydro- Temp System Noise and Vibration
Isolation
A quality installation should be one where noise is not a
complaint. A number of inexpensive features can be
added to reduce noise and also aid in installation and
maintenance. Flexible hose kits to the hot water loop
will make for easy connection to the heat pump and the
hot water tank and also reduce any noise being
transmitted from the heat pump to the indoor
plumbing. Next the heat pump and all associated water
pumps should be installed on a shock-absorbing pad to
isolate the heat pump from a hard surface floor. This
pad will help stop the possibility of the cabinet being
rusted out by trapped moisture under the unit. Flexible
duct connections help to stop noise from the heat
pump being transmitted through the metal ductwork.
This collar also makes the connection of the heat pump
to the ductwork a much simpler task. It is not
recommended to hang the Hydro-Temp unit from the
floor joist, but if this becomes necessary, adequate
isolation MUST be provided to reduce unit noise and
vibration from being transmitted to the rest of the
building.
4.2 Air Filtering
To maintain good indoor air quality in a tight building,
the air distribution system should have a high-efficiency
air filter. To ensure proper unit operation, be sure to
inform the building owner of the importance of proper
maintenance and the maintenance schedule for the
filter installed. Most air filters require monthly
attention. On the first of every month the “CK Filter”
button will appear on the main screen of the Protostar
thermostat as a reminder to clean or replace the air
filter. Press this button for instructions on how to reset
the filter indicator after the filter has be cleaned or
replaced. This feature can be turned off in the
customer settings.
4.3 Construction / Remodeling
The Hydro-Temp system should never be run during any
kind of construction or remodeling that would allow
drywall, hard wood, or any kind of dust to be pulled in
the system. Even with extra filtering dust particles can
accumulate in the duct system causing unwanted dust
To Next Page
Loading...