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Adjus ng the
Manifold Gas
Pressure and
Firing Rate
WARNING
Complete the following procedures
ONLY if you have been instructed
to do so by the Technical Service
Department. Incorrect adjustment
may result in carbon monoxide
poisoning.
NOTICE:
Incorrect adjustment may damage
the water heater and/or shorten
its lifespan. Therefore, changing
the manifold pressure is not
recommended unless there are very
strong reasons to do so (e.g., high
elevation installations).
Checking the Manifold Gas
Pressure
1. You must verify proper gas supply
pressure and pressure drop, before
proceeding with this procedure.
Manifold pressures will not be
properly set if supply pressure and
pressure drop are outside allowable
tolerance.
2. Verify proper DIP switch settings for
vent length and altitude. Incorrect
DIP switch settings will cause
improper readings. NOTE: This water
heater's gas type is field convertible,
confirm the orifice installed matches
the gas type supplied. See Removing,
Replacing, and Verifying the Gas
Orifice Assembly on page 47.
3. Turn power to the water heater off
by unplugging it or closing the external
shutoff switch.
4. Shut off the gas supply to the water
heater at the manual gas shutoff valve.
Manifold
Port
Silicone
Tube
To manometer
Figure 12: Manifold port location.
5. Remove the screw from the
manifold port (See Figure 12).
6. Connect a manometer to the
manifold port using a tube. Ensure
that this connection is secure
enough to prevent a gas leak.
7. Turn power to the water heater
on, then turn on the gas supply to
the water heater at the manual gas
shutoff valve.
8. Run water (preferably 3.5 GPM
or more) to activate operation.
It is suggested that you draw a
large amount of flow to prevent
overheating during maximum
burn. If presence of a gas leak is
detected, immediately shut off the
unit and inspect the tube/manifold
connection. Otherwise, proceed to
the next step.
9. Check the manifold gas pressures:
•
Check the manifold pressure
during minimum combustion,
press and hold the "MIN" button
on the computer board (See
Figure 13).
•
The desired pressures are listed in
the "Specifications" section. (See
Table 1 on page 4.)
On-Demand Water Heater Service Handbook for X3P Models
port
Figure 13: Max button on computer board.
10. When you are finished, turn off
water flow and then turn off power
to the water heater.
11. Shut off the gas supply to the water
heater at the manual gas shutoff valve,
before removing the manometer
tube. Then replace the port screw.
Complete the next step ONLY
if you have been instructed to
do so by the Technical Service
Department.
12. IF the manifold pressures do not
match up with those listed in Table
1 on page 4, adjust the manifold
pressure. To do so, refer to the
following procedures.
Adjus ng Manifold Pressure
WARNING! Complete the following
procedure ONLY if you have been
instructed to do so by the Technical
Service Department. See WARNING
text at the beginning of this section.
1. Follow steps 1 - 6 in the previous
section before proceeding to step 2.
2. Use a T15 Torx
adjusting port cover. See Figure 12.
3. Turn power to the water heater
on, then turn on the gas supply to
the water heater at the manual gas
shutoff valve.
4. Run water (preferably 3.5 GPM
or more) to activate operation.
It is suggested that you draw a
large amount of flow to prevent
INCREASE
MAX
DECREASE
MIN
TM
to remove the
•
31
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