Raypak 2503, Инструкция по установке и эксплуатации

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plied via conventional means where combustion air is
drawn from the area immediately surrounding the
heater, or via direct vent, where combustion air is
drawn directly from outside. All installations must com-
ply with the requirements of the NFGC (U.S.) and
B149 (Canada), and all local codes.
Air Filter
An air filter is supplied standard with the heater.
Direct Vent
If outside air is drawn through the intake pipe directly
to the unit for combustion:
1. Install combustion air direct vent in accordance
with Fig. 33 (horizontal) or Fig. 34 (vertical) of this
manual (pages 31 and 32, respectively).
2. Ventilation of the space occupied by the heater(s)
is recommended and can be provided by an open-
ing(s) for ventilation air at the highest practical
point communicating with the outdoors. The total
cross-sectional areas should be at least 1 in.² of
free area per 20,000 BTUH (111 mm² per kW) of
total input rating of all equipment in the room,
when the opening is communicating directly with
the outdoors or through vertical duct(s). The total
cross-sectional area should be at least 1in.² of free
area per 10,000 BTUH (222 mm² per kW) of total
input rating of all equipment in the room, when the
opening is communicating with the outdoors
through horizontal duct(s). Damage to the equip-
ment due to inadequate ventilation of the space is
not a warrantable failure.
3. In cold climates, and to mitigate potential freeze-
up, Raypak highly recommends the installation of
a motorized sealed damper to prevent the circula-
tion of cold air through the heater during the
non-operating hours.
Motorized Combustion Air Dampers or
Louvers:
When motorized dampers or louvers are communicat-
ing directly with outside combustion air, they must be
interlocked with each appliance in the equipment
room, to ensure proper operation. See Field Wiring
Connection section of this manual for proper wiring
instructions, using Fan/Damper dry contacts and
external interlock.
TruSeal™ Combustion Air
In addition to the 3 previous steps, combustion air may
be ducted directly to the heater by using PVC, CPVC
or sealed single-wall galvanized ducting. The duct will
attach directly to the air collar located on the rear of the
heater, using 3-4 sheet metal screws (not supplied)
equally positioned around the circumference of the
duct. The screen assembly should be removed before
attaching any air duct to the heater. The screws and
duct connection point must be sealed with RTV (not
supplied). TruSeal is generally used when damaging
contaminants are present in the mechanical room.
All ducting should be self-supported.
Conventional Combustion Air
Supply
U.S. Installations
All Air from Inside the Building
The confined space shall be provided with TWO per-
manent openings communicating directly with an
additional room(s) of sufficient volume so that the com-
bined volume of all spaces meets the criteria for a
room large in comparison (NFGC). The total input of all
CAUTION: Use TruSeal combustion air if
damaging airborne contaminants are or may be
present in the heater area. See the Appendix of this
manual regarding air contamination.
Fig. 9: Air Filter
NOTE: It is recommended that the intake vent be
insulated to minimize sweating.
CAUTION: Combustion air must not be
contaminated by corrosive chemical fumes which
can damage the heater and void the warranty. (See
the Appendix.)