Navien NPE-180S, NPE-210A, NPE-210S, NPE-240S, NPE-240A Conversion Manualline

123

4

Condensing Water Heater

Gas Conversion
Guide

Model

NPE-180A/210A/240A
NPE-150S/180S/210S/240S

This water heater is congured for Natural Gas from the
factory. If conversion to Propane Gas is required, the
conversion kit supplied with the water heater must be used.

WARNING

This conversion kit shall be installed by a qualied service
agency* in accordance with Navien’s instructions and
all applicable codes and requirements of the authority
having jurisdiction. The information in these instructions
must be followed to minimize the risk of re or explosion
or to prevent property damage, personal injury or death.
The qualied service agency is responsible for the proper
installation of this kit. The installation is not proper and
complete until the operation of the converted appliance
is checked as specied in the manufacturer’s instructions
supplied with the kit.

Procedure:

1. Turn o both gas and water supply to the water heater.

2. Using a Phillips hand screwdriver, remove 4 screws (2 from
the top and 2 from the bottom) of the front cover assembly
to gain access to the internal components. See Figure 1 for
illustration of the front cover on the unit.

Gas Valve

Gas Inlet

Pipe

Figure 1.

NPE Series Front cover

Figure 2. NPE Series

Internal Components

3. Once the front cover is removed, place it in a safe
location to prevent accidental damage. With the internal
components exposed, locate the gas inlet pipe and the Gas
Valve near the left side of the unit which are highlighted in
Figure 2.

6. Once the Gas Orice is exposed, remove the two screws
that hold the part in place. Remove the Gas Orice from
its housing and prepare the new Gas Orice for the LP
conversion for installation.

Remove two (2)

screws here

Figure 4. Access to Gas Orice in Fan Assembly

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 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. Navien water heaters are shipped
ready to re natural gas ONLY.

LP

NPE-150S NPE-180A/ 210A/ 240A/ 180S/ 210S/ 240S

NG

Figure 6. Orice identication

7. Remove the Gas Orice, ensure that the packing is properly
seated inside the port, and then install the new Gas Orice
for use with LP gas. Ensure that the Orice is properly
seated on the packing inside the port before proceeding
to the next step.

Packings

Packing

8. Replace the gas inlet pipe to its original position and use
all screws to secure all connections.

Note

Do not overtighten as this may damage or
crack the components.

* A qualied service agency is any individual, rm, corporation or

company which either in person or through a representative is
engaged in and is responsible for the connection, utilization, repair
or servicing of gas utilization equipment or accessories; who is
experienced in such work, familiar with all precautions required, and
has complied with all of the requirements of the authority having
jurisdiction.

In Canada: The conversion shall be carried out in accordance
with the requirements of the provincial authorities having
jurisdiction and in accordance with the requirements of the
CAN‐B149.1 and CAN1‐B149.2 Installation Code.

Tools Required:

●

Phillips Screwdriver

●

Flathead Screwdriver

●

5

/32 in or 4 mm Allen Wrench

●

Combustion Analyzer or Dual Port Manometer

●

Gas Leak Detector

Included Items:

●

Gas Orice (refer to below table)

Model NG LP

NPE-150S Ø 6.30 Ø 5.10

Model

NG LP

1STAGE 2STAGE 1STAGE 2STAGE

NPE-180A/NPE-180S Ø 4.80 Ø 5.95 Ø 3.80 Ø 4.70
NPE-210A/NPE-210S Ø 6.10 Ø 6.30 Ø 4.50 Ø 4.80
NPE-240A/NPE-240S Ø 6.10 Ø 6.30 Ø 4.50 Ø 4.80

Table 1. Orice Size

●

Gas Pressure and Conversion Kit Number Labels

4. Use a Phillips screwdriver to remove the two screws at
Location A - the connection below the Gas Valve where it
connects to the pipe. See Figure 3 for reference. Once the
screws are removed, carefully separate the pipe from the
Gas Valve.

5. Once the gas inlet pipe is detached from the Gas Valve, nd
Location B - the connection above the Gas Valve where it is
attached to the Fan Motor Assembly. Carefully remove the
four screws by hand using a Phillips screwdriver and pull
the Gas Valve away from the Fan Assembly to access the
Gas Orice.

Location B:

Remove four (4)

screws here

Location A:

Remove two (2)

screws here

Figure 3. Detaching Gas Valve from

Gas Inlet Pipe and Fan Motor Assembly

O-ring

Gas Orice

Packing

O-ring

Gas Orice

Packing

<NPE-150S> <NPE-180A/ 210A/ 240A/

180S/ 210S/ 240S>

Figure 5. Exploded view of Gas assembly

DANGER

See Figure 5. Inspect the O-ring between the gas valve and
gas valve inlet adapter whenever they are disassembled.
The O-ring must be in good condition and must be
installed. Failure to comply will cause a gas leak, resulting in
severe personal injury or death.

DANGER

Inspect the O-ring between the gas valve and gas valve
inlet adapter whenever they are disassembled. The O-ring
must be in good condition and must be installed. Failure to
comply will cause a gas leak, resulting in severe personal
injury or death.

9. Set the Front Panel Dip switch according to the gas type.

WARNING

Be sure to turn o the power before changing the DIP
switch setting.

1 2 NG1 2

LP

1 2 3 1 2 4 5 6 7 8 9 10

ON ON

10. Turn on the gas and water supply to the water heater.

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DANGER

●

When conversion is required, be sure to set the Front
Panel DIP switches according to the supply gas type.

●

Failure to properly set the DIP switches could cause
carbon monoxide poisoning, resulting in severe personal
injury or death.

11. Measure and adjust the gas/air ratio.
Option 1. Using Combustion Analyzer (recommended)
a. Loosen the screw, rotate the plate and remove the

gasket to access the emissions monitoring port as
shown in Figure 7.

b. Insert the analyzer into the port (Figure 7).

Figure 7

Figure 8. Set Screw Location

Note

The set screw is located behind the screw-on
cover. This must be removed rst.

d. Fully open several hot water xtures and set the water

heater to operate at 2-stage MAX mode (refer to
page 8). Measure the CO

2

value at high re.
If the CO2 values do not match Table 2 at high re, do
not adjust the gas valve. Check for the proper Gas
Orice.

DANGER

Improper gas valve settings can cause severe personal
injury, death or substantial property damage.

b. Connect a manometer to the oset pressure port. For

dual port manometers, use the positive pressure side.

Model Kit Part No. Gas Type Oset

NPE-150S

NAC-N6 LP -0.03 in ± 0.01 in

NAC-L6 NG -0.04 in ± 0.01 in

NPE-180A
NPE-180S

NAC-01 LP -0.03 in ± 0.01 in

NAC-100 NG -0.04 in ± 0.01 in

NPE-210A
NPE-210S

NAC-02 LP -0.02 in ± 0.01 in

NAC-200 NG -0.04 in ± 0.01 in

NPE-240A
NPE-240S

NAC-03 LP -0.02 in ± 0.01 in

NAC-300 NG -0.04 in ± 0.01 in

Table 3. Oset value for low re

c. Fully open a hot water xture and set the water heater

to operate at 1-stage MIN mode (refer to page 8).
Measure the oset value at low re and compare it to
the values in Table 3. If the oset value is out of range,
the gas valve set screw will need to be adjusted.
If adjustment is necessary, locate the set screw as
shown in Figure 10. Using a

5

/32 in or 4 mm Allen

wrench, turn the set screw no more than

1

/4 turn
clockwise to raise or counterclockwise to lower the
oset value.

12. Once the CO

2

or oset values have been conrmed,
apply the included conversion stickers to show that the
appliance has been converted to propane gas. Place this
labels adjacent to the rating plate as shown in Figure 11.

Orice Size / Injecteur:

Min. 4.5 mm to Max. 4.8 mm

This unit has been

converted to Propane fuel

Cet appareil a ete converti au Propane

Manifold Gas Pressure /

Pression à la tubulure d’alimentation:

Min. -0.02 to Max. -0.66 inches WC

BTU Input / Debit calorique:

Max. 180,000 - Min. 19,900 BTUh

Conversion Kit No.: NAC-02

Inlet Gas Pressure / Pression d'entrée du gaz:

Min. 8.0 to Max. 13.0 inches

with Kit No. ________________________

This water heater was converted on

(name and address of organization making
this conversion, who accepts responsibility

for the correctness of this conversion)

______/______/______ to ____________ gas

by _________________________________
_________________________________

Figure 11. Proper Placement of Gas Conversion Labels

Note

Manifold Gas Pressure ratings can change due
to updated orice sizes. Please conrm new
manifold pressures approved by CSA before
production of gas conversion labels.

Water
Heater

Fuel

High re Low re

%CO

2

%CO

2

NPE-150S

NG 8.9 9.5

LP 10.2 10.8

NPE-180A
NPE-180S

NG 8.9 9.5

LP 10.2 10.8

NPE-210A
NPE-210S

NG 8.9 9.5

LP 10.2 10.8

NPE-240A
NPE-240S

NG 8.9 9.5

LP 10.2 10.8

Table 2. CO

2

and CO value

(CO2 values must be within 0.5% of the values listed.)

c. Fully open several hot water xtures and set the water

heater to operate at 1-stage MIN mode (refer to page 8).
Measure the CO

2

value at low re.
If the CO2 value is not within 0.5% of the value listed
in Table 2, the gas valve set screw will need to be
adjusted.
If adjustment is necessary, locate the set screw as
shown in Figure 8. Using a

5

/32 in or 4 mm Allen wrench,
turn the set screw no more than 1/4 turn clockwise to
raise or counterclockwise to lower the CO

2

value.

Option 2. Using Digital Manometer
a. Open the oset pressure port by loosening the screw

two turns as shown in Figure 9.

Figure 9

Figure 10

Note

The set screw is located behind the screw-on
cover. This must be removed rst.

d. At high re, do not check the oset value and never

adjust the gas valve.

DANGER

Improper gas valve settings can cause severe personal
injury, death or substantial property damage.

Setting the Operation Mode

1. Using the Front Panel, press and hold the Diagnostics
Button for over 5 seconds until “1.TST” is displayed.

2. Press the + (Up) button once to change the display to
“2.OPR”.

3. Press the Information Button once to acess the Operation
Mode menu.

4. Press the + (Up) button once to set the water heater to
opearate at 1-stage MIN (“MIN.1”).

5. To set the water heater to operate at 2-stage MAX (1-stage
MAX for NPE-150S), press the + (Up) button 3 times or until
“MAX.2 (MAX.1 for NPE-150S)” is displayed.

6. To exit the Operation Mode and return the water heater to
normal operation, press the Reset button twice.

Diagnostics

Information

Reset

Navien, Inc.

20 Goodyear lrvine, CA 92618
TEL [phone] FAX [phone]
www.navien.com