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ADJUSTMENTS
1 Che k gas line pressure and manifold pressure (table 10)
and adjust as required
2 Che k barometri damper for proper operation Parts must
move freely
3 Allow the unit to operate for 15 minutes Drain hot water from
the heater or storage tank to ontinue main burner operation
4 Determine heat input rate (see CHECKING THE INPUT
se tion below)
CHECKING VENTING
The following steps shall be followed with ea h applian e
onne ted to the venting system pla ed in operation, while
any other applian es onne ted to the venting system are
not in operation
1 Seal any unused openings in the venting system
2 Inspe t the venting system for proper size and horizontal
pit h, as required in the National Fuel Gas Code, ANSI
Z223 1or the CAN/CGA B149 Installation Codes and
these instru tions Determine that there is no blo kage or
restri tion, leakage, orrosion and other defi ien ies whi h
ould ause an unsafe ondition
3 So far as is pra ti al, lose all building doors and windows
and all doors between the spa e in whi h the water
heater(s) onne ted to the venting system are lo ated and
other spa es of the building Turn on all applian es not
onne ted to the venting system Turn on all exhaust fans,
su h as range hoods and bathroom exhausts, so they shall
operate at maximum speed Close firepla e dampers
4 Follow the lighting instru tion Pla e the water heater in
operation Adjust thermostat so water heater shall operate
ontinuously
5 After it has been determined that ea h applian e onne ted
to the venting system properly vents when tested as outlined
above, return doors, windows, exhaust fans, firepla e
dampers and any other gas burning applian e to their
previous onditions of use
6
If improper venting is observed during any of the above
tests, the venting system must be orre ted
FAILURE TO CORRECT BACK DRAFTS MAY CAUSE AIR
CONTAMINATION AND UNSAFE CONDITIONS
If the ba k draft annot be orre ted by the normal method
or if a suitable draft annot be obtained, a blower type flue
gas exhauster must be employed to assure proper venting
and orre t ombustion
CHECKING THE INPUT
For installation lo ations with elevations above 2000 feet, refer
to HIGH ALTITUDE INSTALLATIONS se tion of this manual
for input redu tion pro edure
The input rate an be estimated by timing the meter, if no other
applian es are operating
With a stopwat h, or a wristwat h, whi h an display the time
in se onds, read the gas meter and measure the amount of
time required for the heater to onsume 5 ubi feet of gas The
a tual rate may then be estimated by using the formula below
(3600/T) x H
Btuh
T
Time in se onds to burn one ubi foot of gas
H
Btu s per ubi foot of gas
Btuh
A tual heater input
Example
T
15 1 se onds
H
1050 Btu
Btuh
(3600/15 1) x 1050
The input may be adjusted by adjusting the pressure regulator
Remove the top ap to expose the adjustment s rew Turning
the s rew in in reases the gas pressure and ba king the
s rew out de reases the pressure Do not turn the adjusting
s rew in past the point where no further in rease in pressure
is noted
The manifold pressure is measured at the manifold pressure
tap, see figure 7, and should be used as a referen e point
for making pressure regulator adjustments Table 6 gives the
design manifold pressures for ea h model In rease or redu e
the pressure as required to obtain the rated input
If an a
eptable rate annot be a hieved by adjusting the
pressure regulator (manifold pressure), first
ertain that the gas supply pressure to the unit is adequate
If the supply pressure is inadequate, a different burner orifi e
may be required Obtain from the utility the heating value and
spe ifi gravity of the gas at the site Provide this information
and the altitude of the site to obtain a larger orifi e size
UNDER NO CIRCUMSTANCES SHOULD THE GAS INPUT
EXCEED THE INPUT SHOWN ON THE HEATER MODEL AND
RATING PLATE OVERFIRING COULD RESULT IN DAMAGE
OR SOOTING OF THE HEATER
APPROXIMATE TIME REQUIRED TO CONSUME
1 CU. FT. OF GAS AT FULL CAPACITY
INPUT
RATE
INPUT
(BTUH)
BTP-139
139000
BTP-199
199000
BTP-270
270000
BTP-370
370000
26
250,000
TABLE 9.
BTUH
TIMES
PER
(for Natural
CU. FT.
gas in Sec.)
1050
27 2
2500
1050
19 0
2500
1050
14 0
2500
1050
10 2
2500
he k to be
TIMES
(for LP gas
in Sec.)
64 7
45 2
33 3
24 3
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