Raypak P-R185B To P-R405B - Manual (Page 17)

VENT PIPING
Vent piping the same size as the draft hood outlet is
recommended, however, when the total vent height is at
least ten (10) feet (draft hood relief opening to vent
terminal), the vent pipe size may be reduced as speci-
fied in Chapter 10 of the National Fuel Gas Code, ANSI
Z 223.1. (Canada-CAN/CGA-B149.1 and B149.2) As
much as possible avoid long horizontal runs of vent pipe
and too many elbows. If installation requires horizontal
non-vertical runs, the vent pipe must have a minimum of
1/4 inch per foot rise and should be supported at not more
than five foot intervals. Plumbers tape, criss-crossed, will
serve to space both horizontal and vertical piping. Gas
vents supported only by the flashing and extending above
the roof more than five feet should be securely guyed or
braced to withstand snow and wind loads. We recom-
mend use of insulated vent pipe spacer through the roofs
and walls. Another option for installation that requires
horizontal runs is using the D-2 powervent kit option.
For more detailed D-2 installation information consult the
D-2 Power Vent manual 6000.57.
The Power Vent Assembly is a fan assisted combustion
system designed for application to Raypak Pool Heater
Models 185-405. The unit, when installed as directed, is
capable of operating in applications such as through the
wall venting and reduced horizontal and vertical vent pipe
sizes in new and current installations. It is certified for
category III venting up to 40 feet equivalent 4" diameter
venting. The unit is factory wired for 240V, with capability
of rewiring for 120V.
For protection against rain or blockage by snow, the vent
pipe must terminate with a vent cap which complies with
the local codes or, in the absence of such codes, to
the latest edition of the National Fuel Gas Code, ANSI
Z223.1. (Canada-CAN/CGA-B149.1 and B149.2)
Fig. #RP 8119.2
17
GAS SUPPLY CONNECTIONS
The discharge opening must be a minimum of two feet
vertically from the roof surface and at least two feet higher
than any part of the building within ten feet. Vent stack
shall be at least five feet in vertical height above the
drafthood outlet. The vent cap location shall have a
minimum clearance of 4 feet horizontally from, and in no
case below, unless a 4-foot horizontal distance is main-
tained, from electric meters, gas meters regulators and
relief equipment.
The weight of the vent stack or chimney must not rest on
heater draft hood. Support must be provided in compli-
ance with applicable codes. The heater top and draft
hood must be readily removable for maintenance and
inspection. Vent pipe should be adequately supported to
maintain proper clearances from combustible construc-
tion.
Type "B" double wall
or equivalent vent pipe
is recommended.
However single wall
metal vent pipe may
be used as specified
in the latest edition of
the National Flue Gas
Code ANSI Z 223.1.
(Canada-CAN/CGA-
B149.1 and B149.2)
Gas piping must have a
sediment trap ahead of
the heater gas controls,
and a manual shut-off
valve located outside the
heater jacket. All gas
piping should be tested
after installation in ac-
cordance with local
codes.
Fig. #RP 8090.0
Fig. # 9469
WARNING: Indoor boilers require a drafthood that
must be connected to a vent pipe and properly vented
to the outside. Failure to follow this procedure can
cause fire or fatal carbon monoxide poisoning.
Optional Raypak D-2
Power Vent
Power Vent Kit
Model Part No.
185
008086
265 008086
335 008087
405 008087
CAUTION: The heater and its manual shut off valve
must be disconnected from the gas supply during any
pressure testing of that system at test pressures in
excess of 1/2 psig (3.45 KPA). Dissipate test pressure
in the gas supply line before reconnecting the heater
and its manual shut off valve to gas supply line.
FAILURE TO FOLLOW THIS PROCEDURE MAY
DAMAGE THE GAS VALVE. OVER PRESSURED
GAS VALVES ARE NOT COVERED BY
WARRANTY. The heater and its gas connections shall
be leak tested before placing the appliance in
operation. Use soapy water for leak test. DO NOT use
open flame.