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It is essential that all water piping be installed and connected
as shown on the diagrams. Check the diagrams to be used
thoroughly before starting installation to avoid possible errors
and to minimize time and material cost.
It is essential that all water piping be installed and connected
as shown on the diagrams. Check the diagrams to be used
thoroughly before starting installation to avoid possible errors
and to minimize the time and material cost.
HARD WATER CONDITIONS
Where hard water conditions exist, water softening or the
threshold type of water treatment is recommended. This will
protect the dishwashers, coffee urns, water heaters, water piping
and other equipment. When water softening or water treatment
is not practical, a comparatively easy method of periodic lime
removal from the unit may be employed.
SHUTOFF VALVES SHOULD BE INSTALLED FOR SERVICING
BOILER, HOWEVER, LOCAL CODES Should GOVERN THEIR USAGE.
THERMAL EXPANSION (CLOSED SYSTEM)
Thermal expansion occurs in any hot water system when system water
is heated or “recovered” during periods of non-use.
If the system is operated in an “open” condition such as being connected
directly to the city main, the volume of expanded water generated
during the recovery periods can be dissipated back through the “open”
connection to the city main so pressure cannot build up.
However, once a back flow preventer is installed to isolate system
water from the public supply; or a pressure reducing valve is installed
to protect a water meter; or any device preventing flow back into the
cold water supply, the “open” condition becomes “closed”. During
periods of temperature recovery and no usage, expanded water has
no place to go, so the pressure builds up until a relief valve opens
releasing hot water.
A relief valve opening on pressure will flow small amounts of water,
whereas relieving on tempera ture releases large amounts of water.
If your system is closed, some provision must be made for THERMAL
EXPANSION to protect the system from excessive pressure. Install an
expansion tank that is properly and adequately sized for the expanding
volume of water in the system.
Service problems or parts failure due to excessive pressure are not
covered under warranty.
GAS CONNECTIONS
Make sure the gas on which boiler is to operate is same as that
specified on the rating plate. Do not install boiler if equipped for
a different type of gas. Consult your gas supplier.
This boiler is not intended to operate at gas supply pressure other
than shown on the rating plate. A lock-up or positive shut-off
type regulator must be installed in gas supply line. For proper
gas regulation the lock-up style regulators must be installed no
closer than a minimum of 2 feet from the boiler and a maximum
of 7 feet away from the boiler. Exposure to higher gas supply
pressure may cause damage to gas valves which can result in
fire or explosion. If overpressure has occurred such as through
improper testing of gas lines or emergency malfunction of supply
system, the gas valves must be checked for safe operation.
Make sure that the outside vents on supply regulators and the
safety vent valves are protected against blockage. These are
parts of the gas supply system, not boiler. Vent blockage may
occur during ice build-up or snowstorms.
The boiler must be isolated from the gas supply
piping system by closing its main manual gas shut-
off valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than 1/2 psig.
Disconnect the boiler and its main manual gas shut-off valve
from the gas supply piping during any pressure testing of the
gas supply system over 1/2 psig. The gas supply line must be
capped when not connected to the boiler.
It is important to guard against gas valve fouling from contaminants
in the gas ways. Such fouling may cause improper operation,
fire or explosion. If copper supply lines are used they must be
approved for gas service.
When local codes require a main manual shut-off valve outside
the boiler jacket, a suitable main manual shut-off valve must be
installed in a location complying with those codes.
Before attaching gas line be sure that all gas pipe is clean
on inside.
To trap any dirt or foreign material in the gas supply line, a dirt
leg (sometimes called drip leg) must be incorporated in piping.
The dirt leg must be readily accessible and not subject to
freezing conditions. Install in accordance with recommendations
of serving gas supplier. Refer to the current edition of the the
National Fuel Gas Code, ANSI Z223.1/NFPA 54 or the Natural
Gas and Propane Installation Code, CAN/CSA B149.1
Size of gas supply piping may be larger than heater connection
on installations where a significant run of piping is required.
To prevent damage, care must be taken not to apply too much
torque when attaching gas supply pipe to boiler gas inlet. When
installing and tightening gas piping use a second wrench to hold
the gas valve to keep the valve from turning.
Fittings and unions in gas line must be of metal to metal type.
Apply joint compounds (pipe dope) sparingly and only to the
male threads of pipe joints. Do not apply compound to the first
two threads. Use compounds resistant to the action of liquefied
petroleum gases. The boiler and its gas connection must be leak
tested before placing the boiler in operation.
GAS SUPPLY LINE SIZING
The gas piping installation must be capable of supplying
the maximum probable gas demand without excessive
pressure loss. Depending on local practices, the ALLOWABLE
PRESSURE LOSS between the gas meter, or service regulator
and each appliance is generally 0.3 or 0.5 inches of water
column (0.075 or 0.124kPa).
For single boiler installation, refer to Table 6 to size iron pipe or
equivalent gas supply line size to be used with single unit.
For multiple boiler installation or installations of a single boiler
with other gas appliances, please refer to tables 7 and 8 to size
iron pipe or equivalent gas supply line. These tables are taken
from the current edition of the National Fuel Gas Code, ANSI