Haws 8710 Guide

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 1 of 32
1455 Kleppe Lane Sparks, NV 89431-6467 [phone] Fax [phone]
E-mail: [email protected]m  Website: www.hawsco.com
No. 0580001081(1)
Model 8710
Outdoor Tempered Water Shower and Eyewash System
Area Classification –Ordinary
INSTALLATION, OPERATION
&
MAINTENANCE INSTRUCTIONS

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 2 of 32
DISCLAIMER
IMPORTANT
Read this installation manual completely to ensure proper installation, then file it with the owner or
maintenance department. Compliance and conformity to drain requirements and other local codes and
ordinances is the responsibility of the installer.
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.
Flush the water supply lines before beginning installation and after installation is complete. Test the unit
for leaks and adequate water flow. Main water supply to the emergency fixture should be “ON” at all
times. Provisions shall be made to prevent unauthorized shutoff. Please refer to the enclosed
instructions for flushing the unit prior to use.
The ANSI Z358.1 standard requires an uninterrupted supply of potable water. Water supply must be
capable of providing specified capacity (GPM) and water pressure range (PSI) at all flow rates.
The inspection and testing results of this equipment should be recorded weekly to verify proper
operation. This equipment should be inspected annually to ensure compliance with ANSI Z358.1.
Installation and maintenance of this system must be completed by a qualified plumber and electrician in
accordance with the information contained in this installation manual and in compliance with all national
and local codes. When making electrical connections, be sure to follow all lockout-tag out safety
procedures.
It is recommended that all water supply and electrical connections be made at temperatures above
freezing (32ºF (0ºC)). Failure to do so may result in product and or property damage.
For technical support, contact:
Haws Services | [phone] | www.hawsco.com/solutions-services/services/

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 3 of 32
TABLE OF CONTENTS
DISCLAIMER................................................................................................................................................2
TABLE OF CONTENTS ...............................................................................................................................3
DESCRIPTION OF PRODUCT.....................................................................................................................4
APPLICATION..............................................................................................................................................4
SHIPPING, HANDLING AND STORAGE ....................................................................................................5
INSTALLATION PROCEDURE....................................................................................................................6
Checklist for start-up ............................................................................................................................10
LOGIC DIAGRAM AND NARRATIVE........................................................................................................11
Tank Control ..........................................................................................................................................12
Alarm Modes –US & [CAN]..................................................................................................................12
Messages................................................................................................................................................13
Real Time Clock (RTC)..........................................................................................................................13
In Use Alarms.........................................................................................................................................14
Fault Condition Notification .................................................................................................................14
Maintenance Required Notification .....................................................................................................14
Space Heater..........................................................................................................................................15
Tank Monitor..........................................................................................................................................15
Tank History...........................................................................................................................................15
Setting Current Time and Date on the Controller ..............................................................................15
PREVENTIVE MAINTENANCE..................................................................................................................16
Weekly ....................................................................................................................................................16
Monthly...................................................................................................................................................17
Quarterly.................................................................................................................................................17
Annually..................................................................................................................................................17
SYSTEM DRAIN AND CHECK PROCEDURE:.........................................................................................19
MAINTENANCE, TESTING, REPAIR ........................................................................................................22
Booth...................................................................................................................................................22
Double Swinging Doors ....................................................................................................................22
Blending Valve System .....................................................................................................................22
Combination Shower/Eyewash ........................................................................................................22
Freeze and Scald Valve.....................................................................................................................23
Y-Strainers..........................................................................................................................................23
TROUBLESHOOTING................................................................................................................................24
SPARE PARTS...........................................................................................................................................25
DRAWINGS ................................................................................................................................................26
General Arrangement Drawing (0580001081.D-GA)...........................................................................26
Electrical Schematic (0580001081.D-EL).............................................................................................28
Piping and Instrumentation Diagram (0580001081.D-PID)................................................................30
LIMITED WARRANTY................................................................................................................................32

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 4 of 32
DESCRIPTION OF PRODUCT
Haws Corporation Model 8710 Tempered Water Shower Booth is a foam-insulated, aluminum skinned
enclosure with high visibility green chemical and UV resistant polyester-based powder coating. Large
graphics identify the building as an emergency shower/eyewash station and assist in guiding the user to
the double swing doors. The interior is illuminated green during standby and changes to white light when
someone enters the doors, or the shower or eyewash is activated. Optional space heating is available for
user safety and comfort and equipment protection.
Hot water generated via an immersion heater is stored in the water tank. Hot and cold water are mixed
with an engineered blending system to provide tepid water for the specified number of combination
shower/eyewash operations. Typical flow rate of a combination shower/eyewash is 30 GPM. The ASSE
1071 certified blending system is a safe, prepackaged, fully engineered and tested system for blending
large volumes of hot and cold water specifically designed for emergency showers and eyewashes. The
system provides multiple levels of protection to prevent scalding, including a high temperature shutoff valve.
Also included is a pressure relief cold-water bypass that allows full cold flow in the event of a hot water shut
off. There are no electrical components in the blending system.
The 8710 booth includes a Haws®combination shower and eyewash that is protected with a scald valve.
Optional alarms are activated by a flow switch when the shower and/or eyewash are in use. Dry contacts
can be provided for remote alarm notification and/or both visual and audible alarms with a silencing circuit
that auto resets can be provided.
APPLICATION
Tank temperatures are set at 165°F for USA and 145°F for Canada.
TANK
SIZE
TANK
TEMPERATURE
SHOWER
CAPACITY (15 Min.)
MINIMUM INLET
TEMPERATURE
119G
145°F
1
62°F
165°F
1
54°F
120G
145°F
1
62°F
165°F
1
54°F
200G
145°F
1
35°F
165°F
1
32°F
318G
145°F
2
50°F
165°F
2
39°F
400G
145°F
2
35°F
165°F
2
32°F

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 5 of 32
SHIPPING, HANDLING AND STORAGE
Model
Description
Dimensions
W x L x H
Weight
Dimensions
W x L x H (Crated)
Weight
(Crated)
8710
Outdoor Tempered Water
Shower and Eyewash System
60” x 120” x 102”
< 4000 lbs.
69” x 134”x 106”
< 5000 lbs.
Recommended Equipment, Materials and Supplies to be provided by Installer:
•Concrete slab rated to support a minimum of 8,000-pound load requirement.
•(4) 3/4” minimum diameter by 1-1/2" minimum length anchor bolts with washers.
•A forklift capable of lifting 5,000 lbs. should be utilized to transport the unit from truck to site. The
unit should be lifted from the rear, or equipment end, and low to the ground.
•Electrical Supply Materials (if applicable).
•Plumbing Supply Materials (if applicable).
•Freeze protection equipment for the water supply leading up to the enclosure (if applicable).
Storage
The unit should be stored in a clean, dry place until ready for installation unless otherwise specified.

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 6 of 32
INSTALLATION PROCEDURE
WARNING: DO NOT connect power before supply plumbing. Connections should be performed by
a certified electrician and plumber only.
a. Remove unit from crate.
b. The unit should be secured on a level site, using the supplied brackets and suitable anchoring
devices. Suggested anchoring devices are 3/4” minimum diameter by 1-1/2" minimum length
anchor bolts with washers.
c. If the booth is to be placed over a drain, the drain should be able to handle a flow of 35 GPM;
otherwise, the slab should be made to allow the water to drain out the sides and away from the
booth (see Figure 1). The unit discharges hundreds of gallons of water, which can cause significant
property damage and a potential hazard if not drained properly.
WARNING: Drainage means shall not create an obstruction or tripping hazard.
Figure 1. Example of Slab with Drain Trough
WARNING: Failure to allow water to drain may result in premature failure of booth, voiding of
product warranty, property damage, and hazard to personnel. (See System Drain and Check
Procedure)

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 7 of 32
d. The connection provided for the water supply is a 1-1/2” NPT union. Water supply lines are required
to be capable of supplying the required pressure and flow to meet ANSI Z358.1. The water supply
line should run for a few minutes prior to connection to eliminate any debris before it enters the
equipment.
e. Connect electrical supply to the Power Distribution Block. It is recommended that a Disconnect
Switch (see Figure 3) is used to safely interrupt the supply for routine maintenance work.
Disconnect switches are available as an option from Haws.
NOTICE: All Power Connections must be made according to local codes and standards using
components which are compliant with the area the unit is being installed in.
Figure 3. Disconnect Switch Junction Box
CAUTION: Do not apply power to the unit until all water connections are made and the tank and
piping are full of water.
f. Once all water and power connections are made, open the supply water inlet valve and fill the
system. While water is flowing into the system, open the emergency shower to facilitate air removal
from the system. After water flows freely from the shower for several minutes, turn the shower off.
Inspect plumbing for leaks and repair as necessary. During transit, some plumbing may have
become loose, allowing water to leak from the threads.
g. The expansion tank should be charged with compressed air to a pressure equal to the water supply
pressure. An air fitting (Schrader valve) is accessible on the top of the expansion tank, under the
plastic cap (see Figure 2).

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 8 of 32
Figure 2. Top of Expansion Tank
CAUTION: Before turning on the power, close all electrical boxes.
h. At this point the power can be turned on. The tank water must be allowed to heat up before the
blending system will function properly. Heating can take up to 12 hours, depending on supply water
temperature and the size of immersion heater and tank. If included, the area/alarm light may blink
until tank temperature set point is reached.
NOTE: The emergency shower or eyewash (see Figure 4) should be utilized for testing of the blending
system. Refer to the Maintenance, Testing, and Repair section of the TWBS.HF Blending System Manual
document for proper adjustment and operation.
Figure 4. Eyewash

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 9 of 32
i. The optional internal space heater has an adjustable thermostat, which is factory set at 70°F (21°C).
WARNING: System is not freeze protected without an energized electrical connection. It is
recommended that installation be completed when ambient temperature is above freezing.

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 10 of 32
Checklist for start-up
CHECKLIST
Complete
OK
Inspector
Initials
Pre-connection Check
Check all components for any connections or connectors that may have loosened during
shipping.
System Flush (All Electrical Power off for System Flush)
Verify that the required water supply pressure is available at the Cold-Water Inlet.
Drain is attached and able to handle a flow of 35 GPM.
Water is clear and free of any contamination, particles, or discoloration.
Connections
System is charged with water and all air is evacuated from the system.
Expansion tank Schrader valve is charged with air equal to water static inlet pressure.
Connect remote monitoring via plant control system (if applicable).
Applying Power to the System
Verify that the proper voltage is present.
Verify that equipment ground is properly connected.
Apply power to the system.
Verify that the space heater thermostat is set to 70º F (21ºC) (if applicable). Increase the
thermostat set point and verify that the heater is producing heat. Return the thermostat to
70ºF.
The tank heater set point is preset in the program. It may take up to 24 hours for the tank to
reach the operating temperature. Once the tank has reached operating temperature for a
minimum of 1 hour, press the “↑” arrow and record these values in the chart provided in the
Tank Monitor section of the program narrative included in this manual.
Verify that interior and exterior lights are illuminated (if equipped). The exterior light may
flash off for 1 second at 5 second intervals until the tank has reached operating
temperature. See Logic Narrative for more information.
HAWS®Shower and Eye/Facewash
Flow water through an eyewash or shower.
Verify that the exterior light flashes at 1 second intervals and that the audible alarm sounds.
Press the alarm silence button and verify that the exterior light is flashing, and the audible
alarm is silent.
Deactivate the shower or eyewash that is active, verify that the exterior light is not flashing,
and that the audible alarm is silent.
Blending Valve
When shower is activated read the center temperature gauge directly above the blending
valve to ensure to the readout is 84ºF (29ºC) ± 5º.
Programmable Logic Controller Display
Set the current time and date in the controller (see instructions below).

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 11 of 32
LOGIC DIAGRAM AND NARRATIVE
The program allows for monitoring and controlling tank temperatures. When no faults are present, the tank
temperature, tank heater status, and flow status are displayed (see Figure 5). There are alarm points that
are continuously monitored. These alarms are shown on the display if the fault is active. Alarm conditions
may also be monitored by connecting to a Distributed Control System (DCS) via interposing relays and
terminals provided when provided. See electrical schematic for details. A fault history is also provided to
assist in monitoring the system performance. Additionally, the tank heater performance can be monitored
to assist in determining when maintenance is required.
Figure 5. PLC Display
Accessing the different functions is accomplished by depressing the appropriate key(s) on the display. The
table below lists the key functions:
Key
Function
←
Display Fault History
↑
Display Tank Heater Monitor
→
Display Current Time
↓
Display Current Date
0
Reset High Tank Temp Alarm
0 & 2
Local Alarm Light Function (Off)
1 & 3
Local Alarm Light Function (On)
Shift + 5
View Time to Preventative Maintenance
Shift + 9
Toggle Preventative Maintenance Feature On/Off

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 12 of 32
The following table lists the inputs and outputs available with the system. System may not contain all
components.
Input
Function
Output
Function
I-00
Tank Temperature Switch
Q-00
Tank Heater Contactor
I-01
Horn Silence Button
Q-01
Space Heater Contactor
I-02
Flow Switch or Proximity Switch
Q-02
Area/ Alarm Light
I-03
Proximity Switch
Q-03
Alarm Horn
I-04
Level Switch
Q-04 (DO Q-00)
Customer Contact (Common)
I-05
Booth Thermostat
Q-05 (DO Q-01)
Customer Contact (In Use)
I-06
Door Proximity Switch
Q-06 (DO Q-02)
Interior Light (Green/White)
AI-01
Tank Temperature Transmitter
NOTE: For model specific program, please contact Haws Services at 1-800-766-5612.
The program consists of a series of charts (sub-routines) that are grouped according to function. Each
chart will be discussed in the following sections.
Tank Control
When the tank temperature is below 163°F (72°C), or 144ºF (62ºC) for Canada, the tank heater contactor
will close, and the heater elements will be energized. When the temperature rises above 166°F (74°C), or
146ºF (63º) for Canada, the contactor will open, and the element will become de-energized.
A low-level condition or an over temperature condition (that has not been addressed) will prohibit the
contactor from closing even if the temperature is below the set point. If the tank temperature transmitter
reading falls below 4mA a potential transmitter failure is present and the tank heater contactor will not close.
The customer trouble alarm contacts are monitored in this section of the program. The following conditions
will de-energize output Q-04 (customer contact trouble) when a potential fault is present:
Alarm Modes –US & [CAN]
Low Tank Temperature under 155°F (68°C) & [135°F (57°C)]
High Tank Temperature over 168°F (76°C) & [150°F (66°C)]
High Tank Temperature over 175°F (79°C) & [155°F (68°C)] REQUIRES MANUAL RESET
Low Tank Level
NOTE: Each alarm mode will display an alarm message on the PLC display and only the external light will
flash once every 5 seconds. The Tank high temperature alarm is designed to give a warning by displaying
an alarm message, changing the state of the customer contacts, and flashing the exterior light once every
5 second- intervals, 5 degrees before the temperature rises to a point that requires a manual reset of the
heating equipment. Should the alarm not be addressed before reaching the high set point, then the system
will require additional attention and a manual reset.

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 13 of 32
Messages
The display messages are controlled by the program. When no alarm modes are present, the display will
present the following conditions:
Tank Heater On (when active)
In Use (when active)
Tank Temperature
When a single alarm mode, also called fault condition, is present, the display will indicate which alarm mode
is present. If more than one alarm exists, the display will cycle through each alarm at 4 second intervals.
Each message will automatically clear when the condition is no longer active or when the corrective action
has been taken. This program also records a message to the “Fault History” chart, which will assign the
time and date when the alarm occurred using the Real Time Clock (RTC) module. Timer counter (TC-05
in conjunction with TC-06) will keep track of the 4 second timing intervals and advance the message display
to the next active alarm (if present).
Real Time Clock (RTC)
The RTC module is used to record the date and time for the Fault History (alarm modes) and auto-return
to Winter Mode.
NOTE: If “NO RTC” is shown on PLC display (see Figure 6), remove RTC module by disconnecting from
PLC, re-attach, and cycle the power. If “NO RTC” is still shown, please contact Haws Services at 1-800-
766-5612 as you may need a replacement part.
Figure 6. No RTC - Real Time Clock Display
Fault History
The fault history chart keeps track of the time and date of the last occurrence of each alarm. When the “left
arrow” key is depressed, the time and date of each alarm will be listed on the display. There will be a 4
second delay before the first alarm is displayed. Each alarm will be listed for 4 seconds if the “left arrow”
key is depressed. The time and date of each alarm are stored in registers R-004 through R-021. Once the

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 14 of 32
“left arrow” key is released the display will return to the normal condition display if no alarms are present.
If there are alarm modes in the system, the display will return to the alarm mode display when the “left
arrow” key is released.
In Use Alarms
Shower/eyewash activations are monitored via a flow switch or individual proximity switches connected to
I-02 and I-03. When the shower or eyewash is activated, output Q-05 (in use alarm) will de-energize and
engage the customer contacts. The alarm horn will also energize via Q-03. The exterior light is also
controlled in this chart. The exterior light remains on during normal operation. When the shower or
eyewash is activated, the exterior light will flash on and off at 1 second intervals.
Fault Condition Notification
If a fault is active and there is no shower or eyewash activations, the light will flash once every 5 seconds.
This function gives the user an indication of a fault condition if the unit is not connected to plant Distributed
Control System (DCS) via dry contacts provided on the electrical panel layout. To properly connect DCS
to dry contacts, please refer to the model-specific electrical schematic. It is possible to override this function
by simultaneously depressing the “0” and “2” key. Flag F-026 controls this function. It is set as retentive
to maintain the selection after a power outage. These intervals are controlled by TC-00 through TC-04.
NOTE: If a model-specific electrical schematic is not present or additional information is required to connect
DCS to unit, please contact Haws Services at 1-800-766-5612.
Maintenance Required Notification
On units containing the “Preventative Maintenance Required” notification feature, the area light will flash
once every 10 seconds when preventative maintenance is required. The notification is factory set to activate
after one year of operation and reactivates each following year.
The operating procedure is as follows:
•To view remaining time until Preventative Maintenance is required, press Shift + 5
•To toggle Preventative Maintenance Required feature on/off, press Shift + 9
oTo reset the timer, turn the Preventative Maintenance Required feature off then back on.
The timer will start from 0.
oOn/off toggle can also be triggered by the following push button sequence using the alarm
horn silence button.
▪Press 3 times within 2 seconds, wait 2-5 seconds, and press 3 times within 2
seconds
oActivation of the Preventative Maintenance Required Feature is indicated by 3 short flashes
of the area light accompanied by 3 blips of the alarm horn.

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 15 of 32
oDeactivation of the Preventative Maintenance Required Feature is indicated by 4 short
flashes of the area light accompanied by 4 blips of the alarm horn.
Space Heater
This space heater control program controls the function of the space heater booth thermostat is connected
to I-05, which will engage the space heater contactor (Q-01). An excessive booth temperature may cause
the scald valve to relieve if the booth temperature approaches 95°F (35°C).
Tank Monitor
The tank monitor chart provides a means of monitoring the tank heater performance. This chart records
the actual amount of time that the tank heater contactor is on via registers R-050 through R-052. Counter
TC-14 cycles the chart through the last 3 on/off cycles of the tank heater contactor. TC-13 records the
actual on time of the contactor. When the unit is initially placed in service and has reached operating
temperature for several hours, the on/off cycles should be recorded in the table below. Pressing the “up
arrow” key will display the last three cycles. Each cycle will be displayed for 4 seconds when the key is
depressed.
CYCLE
ON/OFF
TIME
1
2
3
These values can be checked on a routine basis. If the amount of time that the tank heater is on has
increased, it may be an indication that the tank heater needs service or repair.
Tank History
This tank history chart controls the display messages recorded by the tank monitor chart. TC-15 sets the
time that each message is displayed. TC-16 is used to increment from “Heater on time 1” through “Heater
on time 3”.
Setting Current Time and Date on the Controller
1. Press the “SHIFT” and “OK” buttons to enter the menu.
2. Press “4” to enter setup.
3. Press “1” to set date or “2” to set time.
4. After date or time is set, press the “SHIFT” and “↑” key to return to setup menu.
The Time and Date can be verified by pressing the “→” or “↓” keys while in the normal operating screen.

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 16 of 32
PREVENTIVE MAINTENANCE
Note: These are general instructions applicable to all Haws Model 8710 Tempered Shower Booths.
Additional maintenance activities may apply to particular configurations/options supplied.
Weekly
•Verify the tank temperature readout on the display reads 165ºF ± 2ºF (74ºC ± 1ºC) and 145°F ±
2ºF (63°C ± 1°C) for Canada (see Figure 5).
•Verify area lights located inside and outside the booth are operational.
•Verify space heater is functioning by raising space heater thermostat to a set point above the
ambient temperature. Thermostat is mounted on the wall (see Figure 7). After several minutes the
space heater should begin to emit heat. Return space heater thermostat to 70ºF (21ºC).
Figure 7. Wall Mounted Thermostat
•Verify shower and eyewash flow per ANSI requirements.
•Verify temperature gauge on center pipe of blending valve (see Figure 8) reads 84ºF ± 5ºF (29ºC
± 2ºC) flowing.
Figure 8. Blending Valve

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 17 of 32
Monthly
•Verify eyewash flows. Optional Alarm light and horn should activate when water is flowing. Verify
that remote alarms connected to plant controls are functioning.
•Verify shower flow. Optional Alarm light and horn should activate when water is flowing. Verify
that remote alarms connected to plant controls are functioning.
•Check for evidence of leakage on freeze and scald valves.
•Verify correct operation of Blending valve. See Maintenance, Testing, and Repair section.
Quarterly
•Flush Y–strainers
Annually
•Check tank heater for excessive mineral build up on heating coils. Clean or replace if necessary.
•Check condition of tank anode(s). Replace if necessary.
•Drain tank and verify level switch operation (see Figure 9).
Figure 9. Level Switch
•All emergency showers and eye/face washes shall be inspected annually to assure conformance
of ANSI Z358.1. This includes, but not limited to, proper installation, accessible locations, proper
flow rate and temperature of flushing fluid. Please refer to the most current standards document
for more information.

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 18 of 32
NOTE: If the blending valve temperature reading is incorrect, adjust the blending valve by turning the
socket head cap screw located on the bottom of the center section of the valve body.Turning the screw
clockwise will lower the outlet temperature, while counterclockwise will raise the outlet temperature (see
Figure 10). Maximum outlet temperature is approximately 84°F. Outlet temperature will be measured most
accurately by the temperature gauge when water is flowing through the valve.
Figure 10. Blending Valve

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 19 of 32
SYSTEM DRAIN AND CHECK PROCEDURE:
WARNING! System contains HOT water! Failure to DISCONNECT POWER AND ALLOW WATER IN
HOT WATER TANK TO COOL sufficiently prior to draining may cause SEVERE INJURY OR DEATH!
Always follow safe Lock Out –Tag Out procedures.
1. Turn off power at system disconnect switch. Lock Out and Tag Out according to your company’s
procedures.
2. Allow system hot water tank to cool below 100°F. Cooling could take many hours depending on
the ambient temperature. This process can be sped up by opening the shower and allowing the
blending valve to consume the hot water from the tank in the blending process. While the shower
is running, monitor the blending valve hot water inlet mechanical temperature gauge. When the
blending valve hot water inlet temperature gauge drops below 100°F WHILE FLOWING, the tank
temperature will be low enough to facilitate safe system draining.
a. If you will be running the shower to drop the tank temperature, this may be an appropriate
opportunity to also perform an annual test of the shower for ANSI Z358.1 compliance for
flow and pattern.
3. When the hot water tank has cooled sufficiently, shut off the shower if it has been activated, and
turn off the main inlet water supply ball valve located inside the booth on the water supply line. This
is a lockable ball valve and Haws recommends locking this valve in the off position any time the
system is to be drained.
4. If necessary, connect a drain hose to the drain elbow outside the booth and route to a safe drain
location (or to the shower drain if unit is connected to a drainpipe). Do not open drain valve until
step 8.
5. Confirm that the power is disconnected.
6. Unscrew and remove the cover on the Level Switch.
7. Using a multimeter, check continuity across the wired terminal block between the pin labeled “C”
and the pin labeled “NC”. If the tank is full, as it should be at this point, the multimeter should
indicate electrical continuity exists between these two pins. (Note this Double Pole, Double Throw
switch has two identical terminal blocks and testing should be done on the one that is wired.) If the
tank has been heating properly, this test SHOULD be positive. If not, check the connections and
confirm the tank is full.

HAWS®P/N 0580001081 Rev.1 09/20 Model 8710 Page 20 of 32
8. To safely drain tank, relieve system pressure by opening shower then open the ball valve on the y-
strainer in the hot water line located between the top of the tank and the hot side of the blending
valve. Opening this valve allows air to enter the system when draining. Open the system drain valve
inside the booth near the drain outlet elbow in the back wall to drain the system. Continue until
water stops draining.
9. Using a multimeter, check continuity across the wired terminal block between the pin labeled “C”
and the pin labeled “NC”. If the tank is empty (or below the level of the switch), as it should be at
this point, the multimeter should indicate NO electrical continuity exists between these two pins.
(Note this Double Pole, Double Throw switch has two identical terminal blocks and testing should
be done on the one that is wired.) If the multimeter indicates continuity DOES exist when the tank
is empty, the float may be stuck in the up position, which would require removal and cleaning and/or
replacement of the level switch.
10. Remove and inspect the tank “sacrificial” anode rod(s) for condition. These rods are designed to
corrode and deteriorate before other less reactive surfaces in the system, so some corrosion is
normal. If the stainless-steel core can be seen or the rod is grossly deteriorated, it should be
replaced.
11. Remove and inspect the tank heater for excessive mineral buildup on the heater coils. In particular,
if significant debris is noticed in the drain water, the local water is known to be “hard” or have high
mineral content, or tank heater monitoring indicates more and more frequent cycling, consider
removing and inspecting/cleaning the immersion heater. (Electrical disconnection and re-
connection should be done by a qualified electrician) Contact Haws Services for questions at 1-
800-766-5612.
12. Open and clean out the Y-strainers (one in the inlet water line and one in the hot water line).
13. When maintenance is complete and any components removed have been replaced, close the
system drain valve and the ball valve on the hot line Y-strainer if it was opened.
14. Unlock and open the inlet water supply valve and allow the system to fill. Opening the shower can
facilitate purging of air from the system.
15. When the system is full of water, follow appropriate Lock Out, Tag Out procedures to unlock and
turn on the system disconnect switch to restore power to the unit.
16. Allow time for the system to come up to temperature (up to 24 hours) and ensure that all alarms
are clear.