Haws 9326 User manual

INSTALLATION, OPERATION, AND
MAINTENANCE MANUAL FOR ELECTRIC TANKLESS WATER HEATERS
MODELS 9326 & 9327
0002080089, Rev 2

i
IMPORTANT SAFETY INFORMATION
READ ALL INSTRUCTIONS BEFORE USING
DANGER
Indicates an imminently hazardous situation which, if not avoided, will result in death
or serious injury.
WARNING
Indicates a potentially hazardous situation which, if not avoided, could result in death
or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, may result in minor
or moderate injury.
Hot water can be dangerous. There is a high scald
potential if the thermostat is set too high.
Water temperatures over 125 °F (51 °C) can cause
severe burns or scalding resulting in death.
Hot water can cause first degree burns with
exposure for as little as:
3 seconds at 140 °F (60 °C)
20 seconds at 130 °F (54 °C)
8 minutes at 120 °F (48 °C)

ii
IMPORTANT SAFETY INFORMATION
READ ALL INSTRUCTIONS BEFORE USING
1. You must read and follow all
instructions. Serious bodily injury or
death could occur if you ignore this
warning.
2. All circuit breakers and/or disconnect
switches servicing the heater must be
turned off when installing, uninstalling,
or repairing this water heater.
3. The unit must be installed by a
licensed electrician and plumber.
4. The unit must be wired in accordance
with the current version of the
National Electrical Code (US) or
Canadian Electric Code (Canada).
5. This installation must comply with all
national, state, and local plumbing and
electrical codes.
6. When the heater is not within sight of
the electrical circuit breakers, an
additional local means of
disconnection of all ungrounded
conductors must be provided that is
within sight of the appliance or a
circuit breaker lockout must be used.
(Ref. NEC 422.31)
7. Per UL 499, this water heater is not
required to be installed with a
Temperature and Pressure relief valve
(T&P). However, local codes may vary.
In case a T&P relief valve is required, it
must be installed on the outlet hot
water line heater between the heater
and the isolation valve.
8.
If the Haws 93XX unit(s) is installed in
a location where water damage could
occur in the event of a leak, it is
recommended that a drip pan be
installed and connected to a suitable
drain. Alternatively, an active water
leak detector and shut off valve can be
installed to turn off your water supply
in the event a leak is detected.
9. If water supply has a high mineral
content, a water softening system is
recommended. Damage to the water
heater resulting from scale or hard
minerals will not be covered under
warranty.

iii
IMPORTANT SAFETY INFORMATION
READ ALL INSTRUCTIONS BEFORE USING
10.When the heater is installed in a well
water system or if the plumbing
system is prone to introducing air into
the heater, it is highly recommended
that an air separator be installed in the
cold water feed to the heater to avoid
possible failure of the heating element
and/or heating chamber.
11.In accordance with NEC guideline, this
water heater is designed for a
continuous duty cycle of 3 hours at
100% power output. Exceeding this
rating could damage the heater and
void the warranty
12.Provide your heater with potable,
uninterrupted supply of water at a
constant minimum pressure of 35PSI
(based on model) and maximum
pressure of 150 PSI.
13.Use of Water Hammer Arrestors in
applications required; neglecting to do
so will damage the heater and void the
warranty
14.This heater must be in a location
where it is not subject to freezing
temperatures unless supplied with
factory installed freeze protection
15.Properly purge air out of system
before power is applied.
Recommended to purge water
through system for minimum 2
minutes at a minimum 15 gpm, closing
and opening drain valve 3 times to
move any lodged air before power is
applied.
16.
Sanitation models used in a circulator
system, a 30 second factory set delay
program will be installed to establish
flow before power is applied. Contact
Haws Services at [phone].
17.Applications with the use of a
recirculation circulator must be
installed according schematics.
18.The use of Ethylene glycol antifreeze
is strictly prohibited. Propylene Glycol
is the only recommended antifreeze

iv

v
TABLE OF CONTENTS
PERFORMANCE FEATURES.................................................................................................................1
OPERATION PRINCIPLE......................................................................................................................3
MOUNTING THE HEATER TO THE WALL .............................................................................................4
ELECTRICAL HOOKUP ........................................................................................................................5
PLUMBING HOOKUP .........................................................................................................................7
COMMISSIONING THE WATER HEATER............................................................................................10
MONITORING & PREVENTIVE MAINTENANCE..................................................................................14
CONTROL FEATURES .......................................................................................................................15
TROUBLESHOOTING PROCEDURES ..................................................................................................18
TECHNICAL SUPPORT ......................................................................................................................20
INSTALLATION DRAWINGS...............................................................................................................24
WIRING SCHEMATICS......................................................................................................................38

1
PERFORMANCE FEATURES
Heating Technology
Field Replaceable, non-ferrous, lead-free cartridge-style direct heating element
Safety and Reliability
Thermo-Optical sensor for protection against entrained air or improper commissioning
Materials and Construction
NSF-61 listed materials of construction
Control and Consumption
Active energy management to ensure optimal application of energy based on real-time system demands
Multistage element turn-on
Visual user interface for field programming
Turn-on Flow Rate
Integrated high-capacity flow meter
Field adjustable maximum activation flow rate (minimum activation flow rate factory set and is not field
adjustable.)
Pressure Rating
Operating pressure range not to exceed 60 –90 PSI. Maximum pressure rating 150 psi
Available Enclosures
N4 –NEMA 4 (Standard)
N4X –NEMA 4X 304SS
N4X6 –NEMA 4X 316SS
Class l Div II enclosures
Optional Features for Non-N1 Applications
Indoor disconnect switch (fused or non-fused)
Stand Kits (for freestanding applications)
Alarm contacts
GFCI
FREEZE PROTECTION
Remote Display
N1–NEMA 1(Non-waterproof)

2

3
OPERATION PRINCIPLE
How the Haws Tankless Water Heater Works
Operating the new Haws tankless water heater is similar to using any traditional water heater system. However, it is
very important that all of the set-up procedures and operating instructions are carefully read to ensure maximum
performance and energy savings from the water heater.
The Haws tankless water heater does not store hot water like a conventional tank-type water heater. It contains high
powered bare wire technology heating elements that are capable of heating water instantly on-demand. Whenever
there is a hot water demand, thepatented flow meter within the heater recognizes the demand and initiates the
heating process. This meter measures the water flow rate while two thermistor sensors measure the incoming and
outgoing water temperature. This information is transmitted continually to the microprocessor controller which
determines the precise amount of power to send to the heating elements to heat the water to the desired
temperature. The Haws tankless water heater only uses as much power as is needed to meet the demand by fully
modulating the heating elements from 0 to 100%.
It is important to keep in mind that all tankless water heaters are subject to a maximum flow rate. If this flow rate is
exceeded, the heater will not be capable of fully heating water. The amount of water that can be heated by the tankless
water heater at any given time will depend on the model selected and the incoming water temperature. See diagram
on below to determine the maximum flow rates. Since a tankless water heater eliminates the ongoing thermal losses
caused by storing hot water in a tank, there will be a significant energy savings compared to a conventional tank type
water heater.
Temperature Rise at Specified Flow Rate (°F)

4
MOUNTING THE HEATER TO THE WALL
Please follow the mounting instructions as appropriate to your installation. Haws recommends the heater be installed
close to the point of use.
CAUTION
This heater must be installed in a location where it is not subject to freezing
temperatures, unless supplied with factory installed freeze protection
Make sure the brass fittings are at the bottom of the heater. No other heater orientation is permitted.
The 9326/7 series is approved for zero clearance to
combustibles. Above clearances recommended for service
and installation.
10” Top Clearance
8” Clearance
8” Clearance
18” Clearance

5
ELECTRICAL HOOKUP
Haws recommends your heater be installed or serviced by a licensed plumber and electrician.
WARNING
Before beginning any work on this installation, BE SURE THAT THE ELECTRICAL
BREAKER IS “OFF” AND THAT ALL MOUNTING AND PLUMBING WORK HAS BEEN
COMPLETED PER THESE INSTRUCTIONS.
This heater must have its own independent circuit using insulated, UL listed wire conductors of the appropriate size
suitable for up to 90° C and protected by the correctly rated circuit breaker.
See chart on next page.
Before starting any electrical work VERIFY there is
no power at the heater before proceeding
The power conductors are to be secured to the L1, L2 and L3 connectors on the terminal block (Fig. 1) or
contactor (Fig. 2). The ground is to be secured to the GND connector to the right of the terminal block.
Fig. 1
L1 L2 L3 GND
Fig. 2
L1 L2 L3 GND
WARNING
FAILURE TO GROUND THE SYSTEM MAY RESULT IN SERIOUS INJURY,
DEATH AND/OR PROPERTY DAMAGE.

6
Electrical Specifications
A green terminal (or a wire connector marked “G”, “GR, “Ground”, or “GROUNDING”) is provided within
the control box. To reduce the risk of electric shock, connect this terminal or connector to the grounding
terminal of the electric service or supply panel with a continuous copper wire in accordance with your
local electrical code.

7
PLUMBING HOOKUP
MUST FLUSH LINE A MINIMUM 5 MINUTES, AT A MINIMUM 15 GPM ON INITIAL START UP
The heater is equipped with NPT brass fittings.
Make sure ONLY NPT fittings are used for connection to this heater.
Connect the cold water line with the inlet connection
(RIGHT fitting)
Connect the outlet pipe with the outlet fitting
(LEFT fitting)
Do not reverse connections.
CAUTION
Never use pipe dope when making plumbing connections to this heater. Follow
standard industry practice with careful application of Teflon tape. Do not allow Teflon
tape to get into the heater.
CAUTION
Never solder any pipe connections while attached to this heater –damage to the
heater will result. Doing this will void the warranty.
PRV VENT LOCATION. The PRV Vent is not a code
compliant pressure relief valve. Check local codes to
see if a code compliant T&P Relief Valve is required
in your installation.
HOT
WATER
OUT
COLD
WATER
OUT

8
WARNING
MUST FLUSH OUT WATER HEATER FOR MINIMUM 5 MINUTES AT A MINIMUM 15
GPM ON INITIAL START UP OR AFTER ANY SERVICE WORK HAS BEEN PERFORMED.
CLOSE AND OPEN DRAIN VALVE 3 TIMES TO REMOVE ANY LODGED AIR BUBBLES.
FAILURE TO DO SO MAY DAMAGE THE HEATER.
MINIMUM INLET WATER PRESSURE 35 PSI DYNAMIC.
MAXIMUM WATER PRESSURE NOT TO EXCEED 150 PSI. RECOMMENDED
OPERATING PRESSURE 60 –90 PSI.
USE OF A PRESSURE REGULATOR RECOMMENDED.
Water supply inlet piping must be a minimum 1 ¼” pipe diameter and it must be a
dedicated supply line. 2 ½” minimum pipe diameter on trunk main when part of a
branch system.
THE USE OF DI-ELECTRIC UNIONS MUST BE USED ON THE INLET AND OUTLET
PORTS OF THE WATER HEATER. RECOMMENDED 40 MESH Y STRAINER BE INSTALLED
IN COLD WATER INLET TO PREVENT DEBRIS FROM ENTERING THE WATER CHAMBERS.
BLOCKAGE CAUSED BY DEBRIS MAY CAUSE ELEMENT FAILURE. ISOLATION VALVES
RECOMMENDED FOR SERVICING
In applications where a long duty cycle is needed (more than 3 hours continuous
run time), or a short duty cycle (less than 30 sec. on time with less than minute off
time) please contact applications department. 1-800-543-6163
HAMMER ARRESTOR: SYSTEMS WITH A LARGE WATER VOLUME, OR LONG
LENGTHS OF PIPING CAN BE SUSCEPTIBLE TO WATER HAMMER. THE USE OF SLOW
ACTING VALVES ALONG WITH THE INSTALLATION OF A WATER HAMMER ARRESTOR IS
HIGHLY RECOMMENDED ON ALL UNITS. FAILURE TO INSTALL A WATER HAMMER
ARRESTOR CAN CAUSE DAMAGE TO WATER HEATER AND VOID WARRANTY- Refer to
manufacturer’s installation manual for proper size and installation location.

9
Proper water conditions must be maintained to prevent damage to the water heater.
CONSTITUENT (MG/L)
MINIMUM REQUIREMENT
BETTER
BEST
Alkalinity
50
25
10
Calcium
25
5
0.5
Carbon Dioxide
0
0
0
Chlorine
100
15
1
Free Chlorine
1
1
0.05
Iron
0.2
0.1
0.01
Magnesium as Mg
0.5
0.1
0.1
Magnesium as Mn
0.1
0.1
0.1
Nitrate
25
25
10
Oxygen
2
1
0.1
Silica
15
10
1
Sodium
50
10
1
Sulfate
25
25
1
TDS*
200
100
5**
Total Hardness
25
10
1
pH
6.5 –8.5
6.5 –8.5
6.5 –8.5
Turbidity (NTU)
5
5
1
* NOTE: Total dissolved solids
** NOTE: Do not reduce the TDS beyond this amount or the water will be too aggressive

10
COMMISSIONING THE WATER HEATER
CAUTION
BEFORE SWITCHING THE ELECTRICAL BREAKER “ON”, MAKE SURE THE INLET AND
OUTLET BALL VALVES ARE FULLY OPEN AND WATER IS FLOWING THROUGH ALL
POINTS OF USE FOR A MINIMUM OF 5 MINUTES AT A MINIMUM 15 GPM. Open and
close drain valve 3 times while purging to remove any lodged air bubbles. DO NOT
SWITCH THE BREAKER “ON” IF THERE IS ANY POSSIBILITY THE WATER IN THE HEATER
IS FROZEN.
After verifying the heater has been purged of air (see above)
turn the circuit breaker/disconnect “ON” and observe the
start-up sequence on the display. The LCD screen will display
the SETPOINT TEMPERATURE in degrees F.
Below the display are 4 push buttons that are used to control
the function of the heater. Press the UP or DOWN buttons to
establish your desired temperature. Refer to the CONTROL
FEATURES section of this manual for additional information.
SETPOINT
TEMP 120F

11
Startup Process
Plumbing Installation Checklist MUST BE FILLED OUT AND LEFT WITH WATER HEATER. MUST FLUSH WATER HEATER
FOR MINIMUM 5 MINUTES AT A MINIMUM.
Important - Read and fully understand all steps outlined below before proceeding. Failure to do so may damage the
water heater and void any warranty. Technical support is available at 1 [phone]
Plumbing Installation Checklist
Step
Category
Action
Confirmed By
Notes
1
Water
Heater is supplied with clean potable water
2
Water
Plumbing orientation is correct –water connections on the bottom - inlet on
the right, outlet on the left
3
Water
Ensure piping connections are not causing stress or torque on the inlet and
outlet fittings
4
Water
No leaks at water connection or in plumbing network
5
Water
Water pressure is between 40-90 PSI (min 35psi)
6
Water
Long pipe runs, high flow rates and valves closing can cause pressure spikes
(water hammer) above 1000 PSI. Consult piping schematic to ensure
arrestors and regulators are properly sized and located.
7
Water
(with power off) Open supply valves to water heater - run water through
fixtures to purge all air and debris in system. With water flowing, visually
inspect the clear element tubes between the inlet and outlet manifold to
ensure no air bubbles are present. (this may take several minutes)
8
Water
Using a flashlight, visually inspect heating chamber for any signs of leakage
9
Water
Ensure Water Heater will not freeze
10
Water
Ensure all local plumbing codes are met
11
Water
Plumbing installation correct and complete
Important - Read and fully understand all steps outlined below before proceeding. Failure to do so may damage the
water heater and void any warranty. Technical support is available at 1 [phone]
Electrical Installation Checklist
Step
Category
Action
Confirmed By
Notes
12
Power
(with power off) - Breaker and disconnect are of proper size and correctly
installed
13
Power
(with power off) - Wiring and conduit are of proper size and correctly
installed.
14
Power
(with power off) - Wiring connections at terminals are correct orientation,
tight, with no stray wire strands or pinched sheathing
15
Power
(with power off) - Proper ground,(not neutral) is clean, and tight
16
Power
(no water flowing, do not turn it on, close outlet water shut off valve if
uncontrolled environment-left hand side) Apply power - ensure voltage
and phasing is according to model rating
17
Power
Disengage power after voltage and phasing is confirmed (open outlet
shutoff valve if closed during step 14)
18
Power
Ensure all local electrical codes are met
19
Power
Electrical Installation correct and complete

12
Important - Read and fully understand all steps outlined below before proceeding. Failure to do so may damage the
water heater and void any warranty. Technical support is available at 1 [phone]
Startup Procedure and Checklist
Step
Category
Action
Confirmed By
Notes
20
Startup
Water requirements (Steps 1-11) are confirmed
21
Startup
Electrical requirements (Steps 12-19) are confirmed
22
Startup
Plumbing Codes and Electrical Codes are met and confirmed
23
Startup
(with power off) Open supply valves to water heater - run water through
fixtures to purge all air and debris in system. With water flowing, visually
inspect the clear element tubes between the inlet and outlet manifold to
ensure no air bubbles are present. (this may take several minutes)
Chugging or burping of water is also an indication of air
24
Startup
Turn off water flow at all fixtures, keeping water heater supply valves open
25
Startup
Apply power to water heater
26
Startup
Turn water flow on at fixtures
27
Startup
LCD display board is illuminated
28
Startup
Contactors engaged (audible click)
29
Startup
No error codes
30
Startup
Scroll through display (If display is locked, consult manual for unlock
procedure)
31
Startup
Adjust settings if needed. Note - Keep temperature setting as low as
possible for scald potential and minimizing abuse on the heater.
32
Startup
Confirm TURN-ON setting meets fixture flow rate
33
Startup
Confirm SETPOINT setting on display
34
Startup
Confirm ACTUAL TEMP output on display
35
Startup
If SETPOINT does not match ACTUAL TEMP then use the TEMPERATURE
RISE CHART in manual along with LOAD%, INLET TEMP and FLOW RATE on
display to determine the maximum theoretical output.
36
Startup
Shut water flow off at fixture
37
Startup
Power disengaged (audible)
38
Startup
Repeat startup steps 25-28 to ensure proper activation and performance
39
Startup
Water heater installed correctly and operating as designed
After all steps are completed, the heater is fully installed and ready for use.

13
Shutdown Process (Normal, Emergency, and Long Term)
Shut Down Procedure
Important - Read and fully understand all steps outlined below before proceeding. Failure to do so may damage
the water heater and void any warranty. Technical support is available at 1 [phone]
Step
Category
Action
Confirmed By
Notes
Normal Shut Down Procedure
1
Normal
Shut power off to unit in order of sequence - In-door (on-door)
disconnect (if applicable) local disconnect, main breaker - perform
lock out procedure per facilities requirements
2
Normal
Close applicable water valves - Inlet and outlet (water heater will
not be drained)
Emergency Shut Down Procedure
1
Emergency
Shut power off to unit In-door (on door) disconnect (if applicable) or
local disconnect
2
Emergency
Shut water valves off - inlet and outlet (water heater will not be
drained)
3
Emergency
Complete lock out procedures per facilities requirements
4
Emergency
Notify all parties involved that water heaters are shut down
Long Term Shut Down Procedure
1
Long Term
Shut power off to unit in order of sequence - Indoor disconnect (if
applicable) local disconnect, main breaker - perform lock out
procedure per facilities requirements
2
Long Term
Close applicable water valves - Inlet and outlet (water heater will
not be drained)
3
Long Term
Drain water heater through plumbing network, run compressed air
through the water heater to ensure the heater is completely
drained
4
Long Term
Lock out all applicable water valves per facilities procedures