Rev. B 1-22-04 P/N 472235
17
PIPE SIZED FOR LENGTH OF RUN IN EQUIVALENT FEET
Table 1.
Natural
Maximum inlet gas pressure 10 in. WC
Minimum inlet gas pressure 4 in. WC
Normal manifold pressure 2 in. WC
*All Readings are taken with the heater fired. Any adjustments
or readings made with heater off will give incorrect readings.
OFF
ON
Regulator Adjustment Cap
1/8" NPT Plug
(Manifold Press)
1/8" NPT Plug
(Inlet Press)
Figure 11.
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CAUTION
Manifold gas pressure for the TSI, Low NOx heater should
NOT exceed 2.0” W.C.
REGULATED MANIFOLD PRESSURE TEST
1. Attach the manometer to the heater jacket.
2. Shut off the main gas valve.
3. Remove 1/8 in. NPT plug on the outlet side of the
valve and screw in the fitting from the manometer kit.
See Figure 11.
4. Connect the manometer hose to the fitting.
5. Turn on the heater.
6. The manometer must read 2 in. WC for natural gas,
while operating.
7. For adjustment, remove the Regulator Adjustment
Cap and using a screwdriver turn the screw clock-
wise to increase - counterclockwise to decrease gas
pressure.
Installation (Gas Line)
CAUTION
The use of Flexible Connectors (FLEX) is NOT recommended as they cause high gas pressure drops.
MINIMAX NT/TSI LOW NOx GAS PRESSURE REQUIREMENTS*
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