Camus Hydronics Valiant FT VA0080, Manual

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with proper volume of gas. A trap (drip leg) must be
provided in the inlet gas connection to the appliance.
2.3.2 Gas Supply Pressure
Gas supply pressure must be maintained within the
specified range in Table 7. Before operating the appliance,
the complete gas train and all connections must be purged
of air and tested using soap solution. The appliance and its
individual gas shut-off valve must be disconnected from the
supply piping when pressure testing the gas supply piping
at pressures above ½ PSI.
Pressure Range Propane Natural Gas*
Minimum (inches WC)
8 4
Maximum (inches WC) 13 10.5
*7” WC recommended regulator setting
Table 7: Gas Supply Pressure Range
2.3.3 Gas Regulators and Lockup Pressure
A stable gas supply pressure is important to achieve stable
operation on gas fired appliances using a 1:1 ratio control
valve for gas pressure regulation.
Lockup pressure (i.e. the pressure upstream of the gas
valve after closing) must not be in excess of 14” WC. It is
paramount that maximum lockup pressure be confirmed
before any attempt is made to start up the appliance. A
suitable lockup regulator with internal or external relief will
not exceed running pressure by more than 20%. An
external relief valve may be required. Operating the Valiant
FT at lockup pressures exceeding the recommended levels
can lead to delayed ignitions and damage to the appliance.
NOTE: In facilities where the incoming gas pressure is
significantly higher than the pressure required, it may
be necessary for several regulators to work together to
stage the gas pressure down in a stable fashion. Check
with the gas supplier for more information.
The final stage gas regulator is to be located a minimum of
10 linear feet (do not factor in equivalent lengths for elbows)
from the appliance. Even regulators classified as fast
reaction type require appropriately dimensioned volumes of
gas between the regulator and appliance, to absorb the
pressure swings caused by fast flow rate variations, and
avoid high lockup pressure.
2.3.4 Connecting the Gas Supply Piping
When connecting the gas pipe line to the Valiant FT, it is
essential to install a manual shutoff valve (supplied with the
appliance) outside the boiler jacket. It is also recommended
to install sediment trap/ drip leg (field supplied), a ground
joint union for servicing and a manual shutoff valve.
Figure 16: Valiant FT Gas Connection
The gas pipe connections to the Valiant FT can be installed
either from the top of the unit, or at the bottom (Figure 16).
The opposite end of the appliance gas train not used for
connecting to the gas supply line should be capped off.
Whenever tightening or loosening the gas piping at the
boiler, it is essential to use two wrenches to avoid
putting stress on the appliance’s gas train
components.
When connecting the gas line from the bottom of the
appliance, install a drip leg / sediment trap upstream of the
boiler gas controls.
The gas line must be supported by hangers and not by any
part of the appliance.
2.4 WATER CONNECTION
This appliance is designed to withstand 30 PSIG working
pressure for sizes 80 MBH to 155 MBH and 80 PSIG from
199 MBH to 399 MBH. Minimum static water pressure in the
appliance must be maintained at 12 PSIG.
Check all applicable local heating, plumbing and building
safety codes before proceeding. If the appliance is installed
above radiation level it must be provided with a low water
WARNING
DO NOT
support the weight of the gas piping on the
boiler! Failure to comply could result in severe
damage, personal injury or death!