Airmark GBW Series, Руководство по установке

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3
4D. Ductwork
Duct systems should be installed in accordance with standards for
air-conditioning systems, National Fire Protection Association Pam-
phlet No. 90A or 90B. They should be sized in accordance with Na-
tional Environmental
System Contractors
Association Manual K,
or whichever is appli-
cable.
On any job, non-flam -
mable flexible collars
should be used for
the return air and dis-
charge connections to
prevent transmission
of vibration (Fig 4D-1).
Although these units
have been specially
designed for quiet vi-
bration-free operation, air ducts can act as soundboards, and if poor-
ly installed, amplify the slightest vibration to the annoyance level.
All main supply and return air drops should be properly sized as
determined by the designer of the duct system and should not nec-
essarily be the size of the duct flange openings of the unit. (The
duct size should never be smaller than the flange openings of the air
handler supply and return air openings.)
A filter rack is provided for a 1”X20”X20” nominal size filter (Fig 4D-
4). Inspect and clean or replace filter every month. A blocked filter
can reduce air flow to the coil and hinder the performance of the
system.
If an accessory grill is being used, the front access panel should be
removed and discarded (Fig 3D-3).
These models have a bottom or front return. Discard the drain ac-
cess panel in the bottom of the unit if this is a bottom return applica-
tion (Fig 4D-2). In case of a front return application, the front access
panel should be removed and discarded.
It is recommended that wherever supply and return air sheet metal
ducts pass through unconditioned areas, they be insulated to pre-
vent excessive heat loss during heating operation. When applied in
conjunction with summer air conditioning, sheet metal duct routed
through unconditioned areas should be insulated and have an out-
side vapor barrier to prevent formation of condensation.
5. Installation
Ensure that the unit is adequately sized.
The tonnage of the outdoor unit should
never exceed the tonnage of this unit.
CAUTION
!
The coil was manufactured with a dry ni-
trogen pre-charge. Release the pressure
through the Schrader valve test port prior
to installation. If holding pressure is not present, return coil
to distributor for exchange.
!
WARNING
Some Airmark coils may include a Schrad-
er valve on the suction manifold. Ensure
that the Schrader valve and valve core
(where present) are protected from heat during brazing and
installation to prevent leakage. Use a core removal tool to
temporarily remove the core when brazing. Replace the core
once brazing is completed.
CAUTION
!
Fig 4D-1.
Fig 4D-2.
Fig 4D-3.
Fig 4D-4.
ü
Clean coil fins with degreasing agent or mild detergent and rinse
fins clean prior to installation.
ü
The refrigerant line sizes should be selected according to the rec-
ommendations of the outdoor unit manufacturer.
ü
Care must be taken to ensure all connection joints are burr-free
and clean. Failure to do so may increase chances of a leak. It is
recommended to use a pipe cutter to remove the spun closed end of
the suction line.
ü
To reduce air leakage, rubber gommets may be present where the
lines pass through the coil case. To avoid damage, remove grom-
mets prior to brazing by sliding over the lines. Use a quenching cloth
or allow the lines to cool before reinstalling the grommets.
ü
Use of wet rags/quenching cloth is highly recommended to prevent
weld-related damages to the casing and Schrader valve (if present).
Only lead free solder should be used to
connect water (hydronic) coil to the hot
water source.
CAUTION
!
Prior to connecting the water (hydronic)
coil, make sure that the hot water supply
is turned off. Water from the heater could
be extremely hot and might result in burns and other person-
al injury along with equipment damage. Ensure that proper
safety gear is being used prior to making connections.
!
WARNING