Noritz CK-56 User manual

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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.
LA CONVERSION DOIT ÊTRE EFFECTUÉE CONFORMÉMENT AUX EXIGENCES
DE L'AUTORITÉ PROVINCIALE AYANT JURIDICTION ET AUX, CSA-B149.1, ET
CAN-B149.2.
Installation Guide
Conversion Kits: CK-56, CK57
WARNING
This conversion kit shall be installed
by a qualified service agency in
accordance with the manufacturer’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 fire or explosion
or to prevent property damage,
personal injury or death. The
qualified 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
specified in the manufacturer’s
instructions supplied with the kit.
WARNING
Cette trousse de conversion ne doit
être installée que par le représentant
d'un organisme qualifié et
conformément aux instructions du
fabricant et à tous les codes et
exigences pertinents de l'autorité
compétente. Les instructions de cette
notice doivent être suivies afin de
réduire au minimum le risque
d'incendie ou d'explosion, de
dommage matériel, de blessure ou de
mort. L'organisme qualifié
est responsable de l'installation
adequate de cette trousse.
L'installation n'est pas adéquate ni
complète tant que le bon
fonctionnement de l'appareil converti
n'a pas été vérifié selon les
instructions du fabricant fournies avec
la trousse.

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*A qualified service agency is any individual, firm, 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.
*Conversion acceptable for install locations 0-2,000 feet. See heater installation manual
for procedures to adjust above 2,000 feet.
NORITZ America Corporation
11160 Grace Avenue
Fountain Valley, CA 92708
866-766-7489
www.noritz.com
CK-IM-14
Rev. 10/14

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1. Before Conversion
Before attempting to convert a unit, verify that the proper kit has been purchased for the model
type*:
Conversion Kit
Model
Conversion Type
CK-56
NRC661(A)-DV/NRC661(A)-OD
Propane to Natural Gas
CK-57
NRC661(A)-DV/NRC661(A)-OD
Natural Gas to Propane
*The model type can be verified from the rating plate located on the front cover of the water
heater.
Tools Required:
Noritz Remote Controller (RC-7651M)
Manometer (Capable of displaying digits in tenths (i.e. 2.4) and up to 20” W.C.)
Philips screwdriver (#2 Recommended)
Pliers
Gas leakage device detector
NOTE: Do not attempt to perform a conversion without access to a manometer and a Noritz
remote controller. A digital manometer is recommended

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2. Included Parts
The following parts are supplied in the
conversion kit. Check for any missing
items before starting the conversion.
Parts
Shape
Quantity
Manifold Plate
1
O-Ring
1
Main Damper
1
New Inlet and Manifold Pressure
Rating Sticker (English)
1
New Inlet and Manifold Pressure
Rating Sticker (French)
1
Date, Gas Type, Kit Number, Name of
Company Sticker (English)
1
Date, Gas Type, Kit Number, Name of
Company Sticker (French)
1

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3. Conversion Procedure
FIGURE 1
Parts Replacement:
1) If the display on the remote controller is on, turn off the unit by pressing the “ON/OFF”
button on the remote controller. There should be no display on the remote controller.
2) Turn off electrical power to heater by disconnecting the electrical plug from the outlet
or shut off the breaker providing power to water heater.
3) Turn off the gas supply to the water heater by closing the gas shut-off valve.
4) Remove the front cover of the unit by removing the 4 screws holding it to the case.
5) To access the manifold plate, the circuit board must be removed. To remove the circuit
board, locate and remove the 2 screws holding the circuit board. Also 3 ground wire
screws for DV models and 2 ground wire screws for the OD mode as indicated in Figure
1. Carefully remove the circuit board from the unit and lay it to the side with the wires
still attached.
Ground Wire
(Two for DV Model)
Ground Wire

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FIGURE 2
FIGURE 3
6) Remove the manifold plate by locating 5 screws as indicated in Figure 2. Do NOT use a
power drill. Discard the original manifold plate.
7) Locate three colored wires from left to right (Orange-Blue, Black-Blue, and Gray-Blue) on
the back of the manifold plate from the electrical solenoids. Disconnect all three
connectors.
8) After manifold plate is removed, the existing damper will be exposed as indicated in
Figure 3 below. Remove screws (1) and (2) then pull the damper off the burner
assembly. Check for proper size of damper with the chart below and replace with new
damper that was included with your gas conversion kit.
Model Name
Gas
Conversion
Damper Size
NRC661(A)-DV /
NRC661(A)-OD
NG to LPG
10-2
LPG to NG
10-4
GRAY
ORANGE
BLACK
(Ex: 10-4 = NRC661(A)-OD-NG)

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FIGURE 4
9) Locate the black O-rings on the gas valve as indicated in Figure 4. If torn or damaged,
remove and replace O-ring with the new O-ring supplied in the conversion kit. Discard
the old O-ring.
10) Insert the new manifold plate supplied with the conversion kit. The orifice size of the gas
manifold plate should be marked as follows (check Figure 5).
Identifying the Proper Manifold Plate per Gas Type:
For NRC661(A)-DV/NRC661(A)-OD models on the sticker below:
To fire Natural Gas (NG) –13-22
To fire Propane Gas (LPG) –09-14
DO NOT continue with conversion if manifold plate is incorrect.
11) Make sure that the O-Ring is secured properly in place. Failure to do so will cause gas
leaks, possibly resulting in severe personal injury or death.
12) Reconnect all three connectors to the electrical solenoids on the manifold from the
locations indicated in Step 7, Figure 2.
13) Secure the new manifold plate to the unit using the screws removed in Step 6. The
screws need only to be hand tightened and should not be tightened using a drill. First,
insert screws 1-5 from Figure 2, but do not fully tighten these screws. Once all screws
are inserted, proceed to completely tighten screws 1-5.
O-Ring
FIGURE 5

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NOTE: When tightening the screws, be certain to not apply excess force as the screws should
turn easily. If extra force is required, stop, remove the screw and tighten by hand first. Excess
force can strip out the original holes.
14) Replace the circuit board that was removed in step 5. Check to make sure that all wires
are properly connected to the circuit board and wire harness and that no wires will be
crimped or damaged when securing the circuit board to the unit. Double check all
ground wires are attached to the manifold plate 3 for DV unit and 2 for OD. Failure to
do so will cause a fault in the water heater.
15) Before replacing the front cover, the unit must be adjusted and tested as described in
the next section.
Adjustments:
1) Before electrical power is applied to the unit, install a remote controller to the unit if it
is not already installed.
2) Reconnect the electrical power to the unit.
3) Within the first ten minutes of connecting electrical power to the unit, but before
pressing the Power ON/OFF button (display should be blank), hold the up button on the
remote controller until the display blinks “99”. This will put the unit into Maintenance
Writer mode. If pressing the up button does not put the unit into Maintenance Writer
mode, make sure the remote display is blank, unplug the unit for sixty seconds, and try
again.
4) After accessing the Maintenance Writer mode, use the “up” and “down” buttons to
change the Maintenance Writer item number display. Pressing the “FLOW METER
ALARM SET” button for 0.5 seconds will change the item number setting from “ON” to
“OFF”. If the Priority lamp is flashing when an item number is displayed, this indicates an
“ON” setting for that item number, and if the Priority lamp is off, the item number is
“OFF”.
5) Change “FC” and “FE” from OFF to ON.
6) Choose the proper conversion setting from the chart below and set the “A1”
Maintenance Writer item number according to the chart below.
NOTE: DO NOT change the other item numbers. This will cause a fault in the water heater.
Models
Desired Gas Type
A1
NRC661(A)-DV/
NRC661(A)-OD
Natural Gas
ON
Propane
OFF

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7) After setting the “A1” item number for the desired gas type, press and hold the “up”
and “down” buttons together for five seconds to confirm the new settings. The remote
controller will emit a beeping tone and the display will go blank when the settings are
confirmed. If this is not done, the unit will not put the setting changes into effect.
NOTE: The setting changes can be cancelled by pressing the Power ON/OFF button
before confirming the settings, or if the unit is left alone for ten minutes without
confirming the settings. If the default setting needs to be changed again, disconnect the
electrical power to the unit, reconnect it and repeat this procedure.
Testing:
1) Before turning on the gas supply to the unit, verify that the inlet gas supply pressure is
within the following operating ranges:
a. Natural Gas Supply: Min. 4 –Max. 10.5 inches
b. Propane Supply: Min. 8 –Max. 14 inches
NOTE: If the supply pressure is higher than the maximum allowable pressure, adjust the
pressure at the regulator or install a secondary regulator on the supply line connected to the
water heater. DO NOT attempt to operate heater if gas supply pressure is not within ranges
specified above. High supply pressure can damage the unit and possibly cause a gas leak.
Next, verify the supply pressure at the unit. To check the gas supply pressure to the unit, a tap
is provided on the gas inlet (Figure 6 below).
Make sure gas supply is turned off to the unit. Remove the hex head Philips screw from the tap.
A 9/32” nut driver is recommended for the removal of this screw. If a nut driver is not available,
a Philips screwdriver can be used. Gently remove the screw, so as not to strip out the screw.
2) Connect a manometer to the tap by using a
silicone tube. Turn on gas supply to unit and
confirm the supply pressure.
3) After supply pressure to heater has been
confirmed, turn off the gas supply, remove the
manometer tube and replace the hex head screw.
4) The manifold pressure will also have to be checked
using a manometer (digital manometer is
suggested). In order to check the gas manifold
pressure, a tap is provided on the manifold plate
inside the unit (Figure 7). The pressure can be
checked either by removing the Philips head screw
(1) and connecting a manometer with a silicon
tube and connecting the appropriate pressure
gauge. Be sure to zero out the manometer before
attaching it to the tap.
FIGURE 6
FIGURE 7

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5) Turn on the gas supply to the unit.
6) Before firing the unit, check for gas leaks at the gas inlet fitting and around the manifold
plate using a gas leak detection device.
7) If not already on, press the Power “ON/OFF” button so that the unit is in standby mode.
The priority light should be on.
8) Open up several hot water fixtures (high flow rate is required through the unit) and
allow the unit to go through its startup sequence. It may take several ignition attempts
in order to purge air from the gas chambers. If an “11” code appears on the remote
controller, reset the unit by pressing the Power button on the remote controller off and
then on again.
9) Once the heater has ignited and has begun to run continuously, locate the manifold
adjustment buttons on the right side of the circuit board (Figure 8).
10) Press and hold both the Mode and Down Buttons simultaneously for more than 2
seconds.
11) Data display changes with the illustration below, when the unit is ready for manifold
pressures adjustment.
*When the Data Display does not change, repeat Step 10 again.
12) Press and hold the maximum pressure set button. Verify from the tables below that the
appropriate pressure is read from the manometer. If the pressure needs adjustment,
use the manifold pressure increase and decrease buttons to adjust to the correct
pressure, while continuing to hold down the maximum pressure set button.
13) Press and hold the minimum pressure set button. Verify from the tables on the
following page that the appropriate pressure is read from the manometer. If the
pressure needs adjustment, use the manifold pressure increase and decrease buttons to
adjust to the correct pressure, while continuing to hold down the minimum pressure set
button.
FIGURE 8
OFF
ON