Camus Hydronics Valiant-FT II Series, Installation And Service Manual

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Table 6: Gas Supply Pressure Range
Pressure Range Propane Natural Gas*
Minimum (inches WC) 8 4**
Maximum (inches WC) 14 14
* 7
” WC recommended regulator setting
** 5” WC minimum pressure for VA0500
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 pipeline 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 15: Valiant-FT Gas Connection
The gas pipe connection to the Valiant FT can be found at
the rear of the unit (Figure 15).
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.
The gas line must be supported by hangers and not by any
part of the appliance.
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!
2.4 WATER CONNECTION
This appliance is designed to withstand 160 PSIG working
pressure. 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
cut-off device at the time of appliance installation (available
from Camus®). Some local codes require the installation of
a low water cut-off on all systems.
This appliance is supplied with a temperature and
pressure relief valve sized in accordance with ASME
Boiler and Pressure Vessel Code, Section IV.
The relief
valve is installed at the top of the appliance on the external
outlet water pipe. To prevent water damage, the discharge
from the relief valve shall be piped to a suitable floor drain
for disposal when relief occurs. No reducing couplings or
other restrictions shall be installed in the discharge line. The
discharge line shall allow complete drainage of the valve
and line. Relief valves should be manually operated at least
once a year. If a relief valve discharges periodically, this
may be due to thermal expansion in a closed water supply
system. Contact the water supplier or local plumbing
inspector on how to correct this situation.
Do not plug the
relief valve.
Be sure to provide unions and gate valves at the inlet and
outlet of the appliance so that it can be easily isolated for
service. Strainers are recommended to be installed into the
system to prevent foreign objects from entering the heat
exchanger. Use suitable pipe hangers or floor stands to
support the weight of all water and gas piping.
The Valiant FT must be installed so that the gas ignition
system components are protected from water (dripping,
spraying, rain, etc.) during appliance operation and service.
2.4.1 Freeze Protection
Appliance installations are not recommended in areas
where danger of freezing exists unless precautions are
taken. An inhibited propylene glycol mixture may be used
as freeze protection, providing it is specially formulated for
hydronic systems. An uninhibited glycol solution may attack
gaskets and seals in the system, therefore extra care is
required when selecting the correct solution.