Gas Supply Connections - Raypak AVIA 264A Installation And Operation Manual

VERTICAL VENT
3' MIN
CAP TERMINATION
(915 MM)
3' MIN
(915 MM)
INSULATED
EXHAUST VENTING
HEATER
Figure 12. Direct Vent - Vertical
A WARNING: No substitutions of vent pipe or vent
cap material are allowed. Such substitutions would
jeopardize the safety and health of inhabitants.
Outdoor Installation
The vent cap provided with the heater is the standard
venting method for outdoor installations.
Care must be taken when locating the heater outdoors,
because the flue gases discharged from the vent cap
can condense as they leave the cap. Improper location
can result in damage to adjacent structures or building
finish. For maximum efficiency and safety, the following
precautions must be observed:
1. Periodically check venting system. The heater's
venting areas must never be obstructed in any
way and minimum clearances must be observed
to prevent restriction of combustion and ventilation
air. Keep area clear and free of combustible and
flammable materials.
2. Do not locate adjacent to any window, door, walk-
way, or gravity air intake. The vent must be located a
minimum of 4 ft (1.2 m) horizontally from such areas.
3. Install above grade level and above normal snow
levels.
4. Vent terminal must be at least 3 ft (0.9 m) above any
forced air inlet located within 10 ft (3.0 m).
5. Adjacent brick or masonry surfaces must be protected
with a rust-resistant sheet metal plate.
NOTE: Condensate can freeze on the vent cap. Frozen
condensate on the vent cap can result in a blocked flue
condition.
18
INTAKE VENT
1' MIN
(305 MM)
ALTERNATE COMBUSTION
AIR INTAKE LOCATION
6" MIN
(153 MM)
12" MIN
(304 MM)

Gas Supply Connections

GA S
S U P P LY
M A N U A L
I N LE T
S H U TOF F
VA LVE
3" M I N
(7. 6 c m )
U N I ON
T Y P I C AL
S E D I M EN T
T R AP
Figure 13. Gas Supply Plumbing
Gas piping must have a sediment trap ahead of the heater
gas controls, and a manual shutoff valve located outside
the heater jacket. All gas piping should be tested after
installation in accordance with local codes.
CAUTION: The heater and its manual shutoff valve
A
must be disconnected from the gas supply during any
pressure testing of that system at test pressures in
excess of 1/2 psi (3.45 kPa). Dissipate test pressure in
the gas supply line before reconnecting the heater and
its manual shutoff valve to gas supply line. FAILURE
TO FOLLOW THIS PROCEDURE MAY DAMAGE THE
GAS VALVE. OVER-PRESSURIZED 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.
Supply Pressure
A CAUTION: Do not use Teflon tape on gas line pipe
thread. Only sealant tape or a pipe compound rated for
use with natural and propane gases is recommended.
Apply sparingly only on male pipe ends, leaving the two
end threads bare.
A minimum of 4 in. WC and a maximum of 10.5 in. WC
upstream pressure under load and no-load conditions
must be provided for natural gas. Required pressure for
Propane Gas: Min = 8.0" WC (Dynamic), Max = 13" WC
(Static).
Gas Pressure Regulator
The gas manifold pressure is preset to a negative -0.30"
WC. If an adjustment is needed, remove the gas valve
throttle seal and turn adjustment screw clockwise
increase pressure or counter-clockwise
pressure. If available, the O2 must be within 4.5 - 5.5%
using a calibrated combustion analyzer.
H E AT ER
J A C K E T
GA S VA LV E
F I E L D - S U P P LI E D
to decrease
to