Camus Hydronics DRH300, Installation, Operation And Service Manual

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12
Air
Intake
2.4.3 LOCATION OF A SIDEWALL AIR INLET TERMINAL
•
The termination point of the sidewall air inlet must be
installed a minimum of 3 feet above ground level and
above normal levels of snow accumulation.
•
The point of termination for the sidewall combustion air
inlet terminal MUST be located a minimum of 3 feet (1M)
horizontally and 12 inches (0.30M) below the point of flue
gas termination (vent cap) if it is located within a 10 foot
(3M) radius of the flue outlet.
2.4.4 LENGTH OF AIR INLET PIPE
The maximum total length of the sidewall or vertical roof top
combustion air inlet pipe as installed from the appliance to the
air inlet terminal must not exceed (100 ft) equivalent feet
(30.5m) in length. Subtract 7 (2.13 m) to 19 feet (5.8 m) of
equivalent length depending on centreline radius for each 90°
elbow installed in the air inlet pipe system. Pressure drop in
45° elbow will be half as much.
PART 3 GAS CONNECTION
Verify that the appliance is supplied with the type of gas
specified on the rating plate. Consult factory for
installations at high altitude.
3.1 GAS CONNECTION
•
Safe operation of unit requires properly sized gas
supply piping. See gas line sizing data.
•
Gas pipe size may be larger than appliance
connection.
•
Installation of a union at the appliance gas line
connection is required for ease of service and
removal of the gas train.
•
Install a manual main gas shutoff valve, outside of the
appliance gas connection as require by local codes.
•
A trap (drip leg) MUST be provided in the inlet gas
connection to the appliance.
•
Optional gas controls may require routing of bleeds
and vents to the atmosphere, outside the building
when required by local codes.
•
Larger models of this appliance may be supplied with
a gas pressure relief valve. This valve is designed to
relieve lockup pressure in excess of the high gas
pressure switch setting. It must be piped to discharge
excess gas pressure through the valve to a safe
location in accordance with local codes. Follow table
5 for sizing the vent line.
Table 5: Gas Pressure Relief Valve – Vent Manifold
Sizing Chart
Size of Combined Vent Line (Sch. 40
pipe)*
Qty. of Pressure
Relief Valves
being combined
Pressure Relief
Valve Size - 3/4"
NPT
Pressure Relief
Valve Size - 1"
NPT
1 3/4" 1"
2 1" 1 1/4"
3 1 1/4" 1 1/2"
4 1 1/4" 2"
5 1 1/2" 2"
6 1 1/2" 2"
7 2" 2 1/2"
8 2" 2 1/2"
* Up to 50 feet. Increase by one pipe size for every 50 feet
or part thereof that the vent line extends beyond the initial
50 feet. The increase is to be made at the connection to
the relief valve.
Vent
12” (30 cm)
Minimum