Keltech CNA-36 User manual

729 S. Grove St., Delton, MI 49046
TEL: [phone] • 800-999-4320 FAX: [phone]
[email protected] • www.keltech-inc.com
Installation
215-1814 Rev. C; ECN 150010
© 2015 Keltech
Page 1 of 20 7/13/2015
CNA-Series
Tankless Heater Models
CNA-36
CNA-54
CNA-63
CNA-72
CNA-108
CNA-126
CNA-144
CNAR-108
CNAR-126
CNAR-144
Voltage options for models:
600V 3-phase
480V 3-phase
415V 3-phase
400V 3-phase
380V 3-phase
Table of Contents
Pre-Installation Information .........................2–3
Storage Instructions .................................4
Mounting Heater....................................5
Plumbing Installation ................................6
Electric Installation ..................................7
Start Up Check List .................................8
Start Up ..........................................9
Digital Controller Operation ..........................10
Operational Tests ...............................11–12
Product Options ...................................13
Maintenance......................................14
Troubleshooting ................................15–16
Special Installation & Operating Instructions ..........17–20

2
CNA-Series Tankless Heater Installation
7/13/2015 Keltech • 215-1814 Rev. C; ECN 150010
DANGER
Tipover hazard. System can crush you resulting in serious injury or death. Read and follow precautions in
this installation manual for instructions on how to safely transport and mount. Do not transport with the
heater in the vertical position. This heater is top heavy and should not be placed in the vertical position until
the site is prepared to anchor the legs to the floor.
WARNING
Read this manual BEFORE using this equipment. Failure to read and follow all safety and user information
could result in death, serious personal injury, minor burns, property damage, or damage to the equipment.
Keep this Manual for future reference. Failure to comply with proper installation and maintenance instructions
could contribute to the heater’s failure.
A qualified plumber or electrician should install and service this system. Install system according to these
instructions and in compliance with national and local codes.
ASSE standard 1016, 1069 or 1070 listed devices should be used at fixtures to prevent possible injury. Severe
bodily injury including scalding, chilling, and/or death may result depending upon system water pressure
changes and/or supply water temperature changes.
For safe operation of the heater, observe all warning labels as indicated.
Water heater system under pressure. Do not open enclosure while in operation.
These heaters should never be used to provide “anti-scald” or “anti-chill” service.
Hazardous voltage inside enclosure may result in serious burns or death. Disconnect power supply before
performing any work in the enclosure.
Failure to ground this system may result in death or serious injury.
Make sure that all water supply lines have been flushed and then completely turned off before beginning
installation. Debris in supply lines can cause valves to malfunction.
CAUTION
Hot pipes! Do not touch. May cause minor burns.
NOTICE
These heaters do not provide protection from supply or outlet pipe freezing.
Consult local building and plumbing codes prior to installation. Should these codes differ from the information
in the Manual, follow the local codes. Inquire with governing authorities for additional local requirements.
Regular checking and cleaning of the heater’s internal components and check stops is necessary for maximum
life and proper product function. Periodic inspection and yearly maintenance by a licensed contractor is
required. Corrosive water conditions, and/or unauthorized adjustments or repairs could render the heater
ineffective for its intended service. Frequency of cleaning and inspection depends upon local water
conditions. For heaters with adjustable output temperatures, check and adjust as needed at initial installation
and on a quarterly basis.
IMPORTANT
Read this entire installation manual to ensure proper installation. When finished with the installation, file this
manual with the owner or maintenance department. Compliance and conformity to local codes and ordinances
is the responsibility of the installer. Product warranties may be found under “Products” on our Web site at
www.keltech-inc.com.
Separate parts from packaging and make sure all parts are accounted for before discarding any packaging
material. If any parts are missing, do not begin installation until you obtain the missing parts.
A qualified plumber or electrician should install and service this system. Install system according to these
instructions and in compliance with national and local codes.

3
Installation CNA-Series Tankless Heater
Keltech • 215-1814 Rev. C; ECN 150010 7/13/2015
Pre-Installation Information
General Information
The Keltech Tankless Water Heater provides instant and precise temperature-controlled hot water. To insure proper
performance, install the heater according to the following installation instructions and in compliance with applicable
national and local codes.
Keltech can supply heaters for most commercial and industrial hot water applications. Flow rates and temperature
figures are important for proper sizing. If needed to meet certain temperature demands, flow control devices
are readily available. See Maximum Temperature Rise Specifications chart. Contact KELTECH, INC. for further
information on available flow control devices.
Operation and Setup
CNA-Series heaters supply an unlimited amount of hot water with specific flow and temperature rise capabilities.
These heaters are energy efficient, reliable, and provide optimum performance in the most demanding applications.
Application Specific Requirements
The CNA-Series can be used in many different applications that require custom tuning for specific applications to
maximize performance of the heater.
For use in a recirculation loop, the incoming loop temperature should not exceed 140°F (60°C) to ensure water
cooling of the solid state relay.
For applications utilizing quick close valves or solenoid valves, it is important to install a hammer arrestor or surge
tank close to the point of use to absorb pressure spikes.
ASME CERTIFICATION: Please verify if your State Boiler Code requires ASME Certification and that you have the
proper heater to meet your code requirements prior to installation.
Installation Considerations
Maximum operating pressure: 160psi.
Minimum flow activation: 1.5 gpm
SCCR Rating
Keltech Electric Tankless Water Heaters are certified by ETL to UL499, UL50E and CSA22.2 No 88. It is designed to
comply with UL508A.
The SCCR load rating is marked on the enclosure per UL508A requirements for Water Heaters controlling a resistive
heating element load.
WARNING For safe operation of the heater, observe all the warning labels as indicated.

4
CNA-Series Tankless Heater Installation
7/13/2015 Keltech • 215-1814 Rev. C; ECN 150010
Storage Instructions
NOTICE! Keep Keltech Electric Tankless Water Heaters stored in original packaging until installation.
Recommended storage criteria:
Store Keltech Electric Tankless Water Heaters where temperatures exceed 35ºF (2º C) at all times.
Indoor storage is recommended.
Minimize excessive on-site transport to reduce risk of shock and impact damage.
Alternate storage:
If in the original crate, Keltech Electric Tankless Water Heaters will withstand outside storage for approximately 1
month in most climates. Crate may not be capable of protecting the heater if left outside longer than this time frame.
If the Keltech Electric Tankless Water Heater is stored in an outdoor environment, care should be taken to protect the
heaters from:
• Rain or other falling precipitation via tarp or other waterproof media.
• Runoff and accumulation of groundwater from any source that may exceed 1 inch.
NOTICE! For heaters with ENHT freeze protection option: If the heater is stored where the temperature
could fall below 45°F(7°C), the heater must be powered immediately after hydro testing to insure
internal freeze protection components are activated. Once the heater is installed and the on-site
plumbing has been hydro tested, the power supply must remain constant until the risk of freeze is
eliminated. If this is not possible, do not allow the heater to remain full of water. The heater must
be drained. Freezing of the heater can cause serious damage. Follow notes in Start Up Check List
section following an electrical lockout/tagout procedure.
Packaging
Crates are constructed from 3/4" OSB.
Crate dimensions approx: 82" x 48" x 24" (2083mm x 1219mm x 610mm)
Crates should not be stacked more than 2 high.
All crates must be stacked evenly and horizontally.
Safety issues related to packaging:
• Product should be transported with the care associated to packages labeled “FRAGILE” even if packaging is not
marked accordingly.
• Standard safety procedures for forklift transport and large items less than 1000lbs should be followed at all times.
• When stored, crate must be supported in entirety of its length and width.

5
Installation CNA-Series Tankless Heater
Keltech • 215-1814 Rev. C; ECN 150010 7/13/2015
Mounting Heater
1
WARNING HIGH VOLTAGE SHOCK. Disconnect power supply before performing any work inside
the heater enclosure.
For best results, install heater as close as possible to the point of use.
Installation is to be performed by licensed trades people.
Long pipe runs are not recommended. A heat loss of 1°F for every 10ft (3 meters) of uninsulated
pipe can occur.
When determining a mounting location, give consideration to the location of the main electrical
panel and ensure accessibility of the enclosure door and other plumbing for service/maintenance.
36" minimum in front of the cabinet enclosure and 48" minimum above the cabinet enclosure are
required.
Bottom View - Leg Mounting Holes
30" (762mm)
12"
(305mm)
2"
(51mm)
4"
(102mm)
8"
(204mm)
6-7/8"
(175mm)
16-1/4"
(413mm)
3-7/8"
(99mm)
3/4" x 7/16" Slot
(6) Places
If heater is installed where freezing can occur, specify Keltech's ENHT Freeze Protection option. Keltech's ENHT
option must be purchased at the time of order. Do not install in areas where freezing can occur without the ENHT
option listed in the model number.
A
Set the heater in a vertical, upright
position with the water outlet located
at top. Use the floor mounting template
on the side of the crate to help with
alignment of the leg mounting.
BSecure heater by bolting each leg to the
floor using 3/8” anchor bolts.
C
Install the pressure and temperature relief
valve on hot water outlet immediately
following the union.
NOTICE! Valve must empty into a
drain.
Rectangle outline on template is not actual size of
heater.
Template may require cutting to fit into tight areas.
Holes are for alignment purposes and may not
represent actual drill size for mounting hardware.

6
CNA-Series Tankless Heater Installation
7/13/2015 Keltech • 215-1814 Rev. C; ECN 150010
Plumbing Installation
2
B
Install one union on the water inlet side of the
heater and another union upstream of the 100
Mesh (150 micron) y-strainer.
Install one union on the water outlet side of the
heater and another after the P & T Relief Valve.
Install the pressure relief valve (150 psi) and outlet
plumbing of heater per code requirements and
route relief valve discharge to drain. Make sure no
shutoff valve is between the relief valve discharge
and the drain. Install hammer arrestor. Ensure
plumbing is secure and not subject to vibrations.
CUse 1-1/4" hard copper tubing or pipe as needed.
AInstall shutoff valve above (upstream of)
the heater inlet.
CAUTION To avoid damage to the electronics
or internal wiring, do not perform
any brazing or sweat soldering
inside the enclosure.
NOTICE! Failure to install proper filtration may
result in a flow sensor malfunction.
NOTICE! To avoid water damage, install a drain
pipe from the pressure relief valve to an
unrestricted drain.
If end use fixture is not at the highest point in
the plumbing loop, then an automatic air vent
valve must be added at the highest point in the
system or at any drop to eliminate trapped air.
Components Needed:
• (4) Union 1-1/4"
• Shutoff Valve
• Pressure and Temperature Relief Valve (150 psi)
• Y-Strainer (100 mesh) or Inline Filter (150 microns)
• (2) Gate or Ball Type Valves
• Drain pipe
• Water hammer arrestor (recommended)
• Elbows, nipples and fittings as needed
B
C
A
31-1/2"
(800mm)
23-1/2" (597mm)
5-1/2" (140mm)
15-1/4"
(387mm)
3-3/4"
(95mm)
6" (152mm)
30"
(762mm)
12"
(305mm)
1-1/4" Female NPT
Outlet
1-1/4" NPT
Female
Inlet
Suggested Location For
Power Entrance. Holes
Provided By Installer.
Relief
Valve
Outlet
Inlet
"Y" Strainer
To Drain
Optional
Fused
Disconnect
Optional
Fused
Disconnect
Maintain area
above Access
Panel for height
"C" to be clear of
obstructions
Rotate outlet 90˚
during installation
for adequate
clearance
Suggested Installation Configuration
Components provided by installer unless otherwise specified.
Reference the product options sections or contact your local Bradley
Representative for product options.
Access Panel
Dim. "A" Dim. "B" Dim. "C"
36kW 60"(1524) 48"(1219) 36"(914)
54kW 60"(1524) 48"(1219) 36"(914)
63kW 72"(1829) 60"(1524) 48"(1219)
72kW 60"(1524) 48"(1219) 36"(914)
108kW 60"(1524) 48"(1219) 36"(914)
126kW 72"(1829) 60"(1524) 48"(1219)
144kW 72"(1829) 60"(1524) 48"(1219)
Dimensions,
Plumbing
and Electrical
Configurations

7
Installation CNA-Series Tankless Heater
Keltech • 215-1814 Rev. C; ECN 150010 7/13/2015
Electric Installation
3
B
Using a hole punch, cut a hole the
proper size for conduit connection;
large enough for the wire size for each
heater. The connectors need to be rated
NEMA4/4X to ensure proper sealing of
the enclosure..
AOpen enclosure door.
CRun wires through the appropriate size
conduit.
DConnect wires to the system terminal
block or fused disconnect inside the
enclosure.
EConnect the ground wire to the stud
provided with the “Ground” label beneath it.
NOTICE! Any option that requires field wiring
must be done with 600V cable per
the schematic that was shipped with
the heater.
NOTICE! Use a 4-core cable or multi-stranded
machine tool wire from an approved
isolating 3-pole switch or circuit
breaker.
NOTICE! Make sure the electrical cable is the
correct size to carry 100% of the full
load current. See table for proper
wire sizes.
WARNING All Keltech heaters must be fused in accordance with National Electric Code (NEC) for the
full load amperage listed on the nameplate rating for each heater.
WARNING Failure to properly ground the unit(s) per the National Electric Code could result in injury or
death.
CNA & CNAR ELECTRICAL SPECIFICATIONS FOR HEATER**
Model Voltage Amps kWatts Min Wire
Size
CNA-363/600D 600 35 36 8 AWG*
CNA-543/600D 600 52 54 6 AWG*
CNA-633/600D 600 61 63 4 AWG*
CNA-723/600D 600 69 72 4 AWG*
CNA-1083/600D 600 104 108 2 AWG*
CNA-1263/600D 600 121 126 1 AWG*
CNA-1443/600D 600 139 144 1/0 AWG*
CNA-363/480D 480 43 36 6 AWG*
CNA-543/480D 480 65 54 4 AWG*
CNA-633/480D 480 76 63 4 AWG*
CNA-723/480D 480 87 72 3 AWG*
CNA-1083/480D 480 130 108 1 AWG*
CNA-1263/480D 480 152 126 1/0 AWG*
CNA-1443/480D 480 174 144 2/0 AWG*
CNA-363/415D 415 38 27 8 AWG*
CNA-543/415D 415 56 40 6 AWG*
CNA-633/415D 415 65 47 4 AWG*
CNA-723/415D 415 75 54 4 AWG*
CNA-1083/415D 415 113 81 2 AWG*
CNA-1263/415D 415 131 94 1 AWG*
CNA-1443/415D 415 150 108 1/0 AWG*
CNA-363/400D 400 36 25 8 AWG*
CNA-543/400D 400 53 37 6 AWG*
CNA-633/400D 400 64 44 4 AWG*
CNA-723/400D 400 72 50 4 AWG*
CNA-1083/400D 400 108 75 2 AWG*
CNA-1263/400D 400 126 87 1 AWG*
CNA-1443/400D 400 144 100 1/0 AWG*
CNA-363/380D 380 35 23 8 AWG*
CNA-543/380D 380 50 33 6 AWG*
CNA-633/380D 380 59 39 6 AWG*
CNA-723/380D 380 68 45 4 AWG*
CNA-1083/380D 380 103 68 2 AWG*
CNA-1263/380D 380 120 79 1 AWG*
CNA-1443/380D 380 137 90 1/0 AWG*
* Based on the NEC Table 310.15 for 75°C insulated wire @ 30°C Ambient
** CNAR (reverse models) electrical specifications are same as CNA heater
models.

8
CNA-Series Tankless Heater Installation
7/13/2015 Keltech • 215-1814 Rev. C; ECN 150010
Start Up Check List
4
Plumbing
System is set in a vertical, level, and upright position with the outlet located at the top. System is mounted by
legs (2) bolted to the floor (3/8" dia. minimum).
Confirm installation of shutoff valve above (upstream of) the union on the inlet connection. Confirm installation of
a Y-strainer (100 mesh screen) or inline filter (150 micron) between the inlet shutoff valve and the heater.
Pressure and temperature relief valve is installed on tepid water outlet immediately following the union. No valve
or restriction is between the relief valve and the system or the relief valve and drain. Shutoff valve is installed
after pressure and temperature relief valve on outlet if required by local or national plumbing codes.
If the hot water process is not at the highest point in the plumbing loop, then an automatic air vent valve must be
added at the highest point in the system plumbing loop to eliminate trapped air.
Electrical
Verify supply voltage matches the indicated voltage on the Serial Tag. Serial Tag is located within the heater
enclosure on the upper right corner of the back plate (mounting plate). Voltage can also be verified on the SCCR
Tag on the door of the heater.
Appropriate conduit is installed properly, secured and sealed to unit enclosure per NEC and hazard
location requirements.
Appropriate conductors for unit routed through conduit and secured to power block inside the enclosure. All
electrical is installed in accordance with national and local electrical codes, including fuse size and rating.
Appropriate earth ground is installed to the lug provided on enclosure backplate.

9
Installation CNA-Series Tankless Heater
Keltech • 215-1814 Rev. C; ECN 150010 7/13/2015
Start Up
5
ASlowly turn on water supply to the unit
with the enclosure door open and the
breaker in the off position.
CTurn off the connected process and
check the entire system to verify leak-free
installation.
DClose enclosure door and secure.
Depress the Emergency Stop Button.
FEnergize the electrical service to the unit
by switching on the breaker.
GPull out Emergency Stop Button. Unit is
now in the ready state.
B
Slowly turn on the water outlet valve,
activate the connected process requiring
heated water (faucet, shower, etc.), then
flush the system for 5 minutes to ensure all
air is purged from the system.
NOTICE! Failure to bleed air properly
will damage elements and
cause heater malfunction.
Be sure that plumbing and electrical are complete per Start Up Check List.
NOTICE! If your heater is mounted in an area
where freezing temperatures are possible,
an ENHT Freeze Protection Option is
strongly recommended and the heater
must be powered at all times to be
Freeze Protected. If continuous power is
not possible, do not allow the heater to
remain full of water. Freezing of the heater
can cause serious damage.
WARNING Make sure the breaker for the heater is OFF.
I
When startup is complete, leave circuit
breaker in the ON position and the
Emergency Stop Button on the door
pulled out. The Green power light should
be illuminated.
HTurn on the connected process; observe
output temperature rise to setpoint.
Top portion of temperature controller
displays output temperature, bottom
displays setpoint temperature.
EIf your heater has the EXP2CFPM
option and is located in a Class I
Division 2 area, please review Special
Installation & Operation Instructions
section for all proper electrical
connections and sealing to ensure
the installation will provide proper
protection. Proceed to Step F once you
have completed the steps in the Special
Installation & Operation Instructions or if
you do not have this option.

10
CNA-Series Tankless Heater Installation
7/13/2015 Keltech • 215-1814 Rev. C; ECN 150010
Digital Controller Operation
6
The preprogrammed digital controller is mounted through the bezel on the enclosure door. The digital
controller will be powered but the bottom display will read OFF until water is flowing through the heater.
The bottom display will then display the setpoint temperature (See Digital Controller Operation section for
more information).
Description Upper Display Lower Display Function
EZ Key Toggles output on/off
Setpoint Up Button Increases output temperature
Setpoint Down Button Decreases output temperature
Infinity Key Back to Home page
Advance Key Advances through parameter prompts
Auto, Man, Off C.r71 Turns Control Loop On/Manual/Off
XX.X% h.Pr1 Heater Power %
no AUt1 Autotune (Contact Factory)
C or F C_F1 Change Temperature Units from F to C
Output Indicators (1-5) Output 1,2,3,4 or 5 are active and operating if
these LEDs are illuminated.
Setpoint Temperature
(Lower Display)
Displays:
• Setpoint
• Percent Power
• Temperature units F or C
• Menu prompt name
• Alarm code
Output Temperature
(Upper Display)
Displays:
• Actual process temp. of outgoing water
• Prompt parameter value
• Error code (feature disabled)
Output Indicators
Output Temp.
Output
Temp. Output
Temp.
No Flow
Setpoint
Temp.
Setpoint Temp.
Setpoint Up
Setpoint Down
Advance KeyInfinity Key
EZ Key
Layout Diagram ON - Heating OFF - No Flow
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5