Pipe Sizing For Natural Gas; Propane Gas; Check Inlet Gas Supply; Operating At High Altitudes - Slant/Fin VSL-160B Installation Instructions Manual

11 - INSTALLATION - Gas supply
11.2 - Pipe sizing for
natural gas
Refer to Tables 11-1 and 11-2 for pipe
length and diameter. Based on rated
boiler input (divide by 1,000 to obtain
ft3/hr). For additional gas pipe sizing
information, refer to ANSI Z223.1 (or
B149.1 for Canadian installations).
Natural gas supply pressure
requirements
1. Pressure required at the gas valve
inlet pressure port:
• Maximum 13"W.C. with no fl ow
(lockup) or with boiler on.
• Minimum 3"W.C. with gas fl owing
(verify during high fi re).
2. Install 100% lockup gas pressure
regulator in supply line if inlet
pressure can exceed 13"W.C. at
any time. Adjust lockup regulator for
13"W.C. maximum.

11.3 - Propane Gas

WARNING!!!
These boilers
are typically shipped ready to
fi re on natural gas. Check boiler
rating plate to determine which
fuel the boiler is set for. If set to
natural gas, it may be converted
to LP by following instruction on
Section 11-6. Failure to comply
could result in severe personal
injury, death, or substantial
property damage.
Pipe sizing for propane gas
Contact gas supplier to size pipes,
tanks, and 100% lockup gas pressure
regulator.
Propane supply pressure
requirements:
1. Adjust propane supply regulator
provided by the gas supplier for
13"W.C. maximum pressure.
2. Pressure required at gas valve inlet
pressure port:
• Maximum 13"W.C. with no fl ow
(lockup) or with boiler on.
• Minimum 3"W.C. with gas fl owing
(verify during high fi re).
WARNING!!!
Ensure that
the high gas pressure regulator
is at least 6 - 10 ft upstream of
the appliance.
11.4 - Check inlet
gas supply
WARNING!!!
DO NOT
adjust or attempt to measure
gas valve outlet pressure. The
gas valve is factory-set for the
correct outlet pressure. This
setting is suitable for natural gas
and propane, requiring no fi eld
adjustment. Attempting to alter
or measure the gas valve outlet
pressure could result in damage
to the valve, causing potential
severe personal injury, death, or
substantial property damage.
The gas piping must be sized for the
proper fl ow and length of pipe, to avoid
excessive pressure drop. Both the gas
meter and the gas regulator must be
properly sized for the total gas load.
If you experience a pressure drop
greater than 1"W.C., the meter,
regulator, or gas line is undersized or in
need of service.
1. Follow Section 12.7 to check the inlet
gas supply pressure.
2. If gas supply pressure is within
normal range and no adjustments are
needed, proceed on to step 4.
3. If the gas pressure is out of range,
contact the gas utility, gas supplier,
qualifi ed installer or service agency
to determine the necessary steps to
provide proper gas pressure to the
boiler.
4. Turn the power switch to the "OFF"
position.
5. Shut off the gas supply at the manual
gas valve in the gas piping to the
appliance.
6. After verifying the correct gas
pressures disconnect the manometer,
turn the screw in pressure connection
"D" in Figure 12-3, clockwise until
snug and check for any gas leaks.
CAUTION!!!
Never force the
pressure connection screw or
the gas valve will be damaged!
WARNING!!!
Never use
an open fl ame to check for gas
leaks, a fi re or an explosion
could result causing severe
personal injury or death!
59
11.5 - Operating at
high altitudes
For installations in the United States,
the boiler is rated for operation at
altitudes up to 2,000 ft (609 m). For
installations at higher altitudes in the
United States, follow local codes or, in
the absence of local codes, follow ANSI
Z223.1/NFPA No. 54, The National Fuel
Gas Code, and check and adjust the
CO2 level following Section 12-9.
For installations in Canada, the boiler is
rated for installations up to 2,000 ft (609
m).