)
INSTALLATION, OPERATION
&
MAINTENANCE INSTRUCTIONS
1455 Kleppe Lane Sparks, NV 89431-6467 (775) 359-4712 Fax (775) 359-7424
E-mail: haws@hawsco.com website: www.hawsco.com
NOTE TO INSTALLER: Please leave this information with the Maintenance Department.
HAWS warrants that this specific product is guaranteed against defective material or poor
workmanship for a period of one year from date of shipment. HAWS liability under this
warranty shall be discharged by furnishing without charge F.O.B. HAWS Factory any goods,
or part thereof, which shall appear to the Company upon inspection to be of defective
material or not of first class workmanship, provided that claim is made in writing to Haws
within a reasonable period after receipt of the product. Where claims for defects are made,
the defective part or parts shall be delivered to the Company, prepaid, for inspection. HAWS
will not be liable for the cost of repairs, alterations or replacements, or for any expense
connected therewith made by the owner or his agents, except upon written authority from
HAWS, Sparks, Nevada. HAWS will not be liable for any damages caused by defective
materials or poor workmanship, except for replacements, as provided above. Buyer agrees
that Haws has made no other warranties either expressed or implied in addition to those
above stated, except that of title with respect to any of the products or equipment sold
hereunder and that HAWS shall not be liable for general, special, or consequential
damages claimed to arise under the contract of sale.
The emergency equipment manufactured by HAWS is warranted to function if installation
and maintenance instructions provided are adhered to. The units also must be used for the
purpose for which they were intended. This product is intended to supplement first-aid
treatment. Due to widely varying conditions, Haws cannot guarantee that the use of this
emergency equipment will prevent serious injury or the aggravation of existing or prior
injuries.
NO OTHER WARRANTIES EXPRESSED OR IMPLIED ARE AUT HORIZED, PROVIDED
OR GIVEN BY HAWS.
SHOULD YOU EXPERIENCE DIFFICULTY WITH THE INSTALLATION OF THIS
MODEL PLEASE CALL:
TECHNICAL SUPPORT: 1-800-766-5612
Tempered Water Blending System
Model TWBS.EW.H
LIMITED WARRANTY
No. 2080380 (11
FOR CUSTOMER SERVICE: 1-888-640-4297
3/15 Model TWBS.EW.H Page 1 of 6
RECOMMENDED TOOLS: Teflon thread seal tape, adjustable pipe wrenches, (Quantity 4)
rust resistant wall anchors (3/16” diameter). Do not use pipe dope.
LOCATION OF UNIT: The Model TWBS.EW.H should be located as near as possible to the
point of use. It must be installed in a vertical position with the inlet and the outlet at the bottom.
SUPPLY LINE: The minimum recommended line size is 1/2" IPS with 45-90 psi (3-6 ATM)
flowing pressure at supply inlet. Cold supply temperatures should range from 35⁰F to 75⁰F.
Where sediment or mineral content is a problem, an inlet filter is recommended.
ELECTRICAL CONNECTIONS: The unit requires 480 VAC/3-phase/60Hz power in a “Delta”
configuration, including three power leads, and a ground conductor, each sized for the
system’s maximum amperage of 24A. The maximum power draw of the system is 20kW.
The customer is responsible for providing a local fused disconnect switch or circuit breaker
sized accordingly.
PLUMBING CONNECTIONS: Inlet supply is female 1/2" IPS, Outlet is female 1/2” IPS.
INTRODUCTION
What is the HAWS TWBS.EW.H?
The HAWS TWBS.EW.H is an instantaneous water heating system for use on emergency
eyewashes where hot water is not supplied. When there is a demand for water at the eyewash,
the heater will instantaneously heat the water to 80º F. The unit requires 480VAC/3-phase/60Hz
power in a ”Delta” configuration, including three power leads and a ground conductor, each
sized for the system’s maximum amperage of 24A. The maximum power draw of the system is
20 kW. The customer is responsible for providing a local fused disconnect switch or circuit
breaker sized accordingly. The Haws TWBS.EW.H incorporates thermally activated and
pressure activated safety features that prevent scalding and improper flow to the eyewash, even
in the event of main unit failure.
How does the TWBS.EW.H operate?
The heart of the TWBS.EW.H is an instantaneous heater that maintains the output water
temperature at 80º F. On the warm water outlet we include a high limit shut off valve, which
reads the output temperature. When the output temperature exceeds the factory pre-set limit of
95º F, the valve shuts down the output from the heater.
On the cold-water side, we include a bypass valve. Should the heater become blocked or the
high limit shut off valve closes, the bypass valve will open, allowing the incoming cold water to
bypass the system and proceed directly to the eyewash.
These two back-up components permit the temperature level of the heated water to be
maintained and permit the flow of cold water should the heater fail.
3/15 Model TWBS.EW.H Page 2 of 6
Performance Features of the HAWS TWBS.EW.H System
Essentially, the HAWS TWBS.EW.H provides fail-safe protection against scalding or blocked
flow. There are two types of failures that can occur with any water heating system. They are as
follows:
1. The heater can fail and provide an unregulated flow of hot water.
2. The heater can fail so as to provide an insufficient and/or blocked flow of warm water.
The unique HAWS TWBS.EW.H provides a high limit shut-off valve and a bypass valve to
address both failure modes.
Capacity
HAWS TWBS.EW.H produces up to 4 gpm at a 45-psi dynamic inlet pressure. The warm water
heater is designed to activate by individual electronic flow rate switches, at a minimum turn on
flow rate of no less than .95 gpm. This unit is sized for one eyewash.
Max
output
@480V
Current
Per phase
Temperature Rise (⁰F)GPM
2.0 gpm 3.0 gpm 4.0 gpm T3 EE Only
5 gpm
T3 EE Only
6 gpm
20kW 24 AMPS 68 46 34 27 23
INSTALLATION PROCEDURE
This installation must conform to the latest requirements of the National Electrical Code and all
applicable state and local codes. This information is available through your local authorities. You
must understand and comply with these requirements before beginning this installation. Haws
recommends your heater be installed by a licensed plumber and electrician.
For additional information, read and follow manufacturers “Instantaneous Water Heater”
installation and owner’s manual supplied with unit.
CAUTION: THIS UNIT IS INTENDED FOR INDOOR USE ONLY.
APPLICATION
The standard TWBS.EW.H is sized to heat enough water for one eyewash at a time. This Water
Heating System should be installed in close proximity to the eyewash. It should be clearly
identified, with easy access and free from obstructions. Supply lines connected to this unit must
be heat traced if subject to freezing temperatures. If the piping network from the heater (located
indoors) to the fixture passes through a cold area, piping should be heat-traced with selfregulating heat tape. Any heat-traced piping should be protected with scald protection bleed
valves. Additionally, should the TWBS.EW.H be mounted at a distance greater than 50 feet from
the eyewash, these runs should be evaluated by a plumbing engineer. Complicated chains of
eyewashes, long piping runs, and recirculating loops should all be evaluated by a qualified
engineer.
NOTE: If for any reason the heater is starved of water while power remains on, the unit may be
damaged. Also, the heating elements only turn on under flow, so any water within the heater
will be subject to atmospheric conditions most of the time. Therefore, the heater should never
be stationed outdoors or in a freezing environment.
3/15 Model TWBS.EW.H Page 3 of 6
WATER SUPPLY
The minimum recommended supply line is 1/2" IPS COLD. Cold supply temperatures should
range from 35°F to 75°F. Outlet connection is a 1/2" IPS dielectric union. We recommend a
manual bypass loop with appropriate tamper resistant shut-off valves to allow for heater water
system maintenance or service without interrupting emergency eyewash operation.
NOTE: All mounting and plumbing must be complete before you proceed with electrical hookup. Test the installation for leaks before connecting the electrical supply.
INSTALLATION PROCEDURE...
PROCEDURE
Use Teflon thread seal tape on all water connections. Do not use pipe dope.
STEP 1: Mount unit on wall (This unit is intended for indoor use only) per attached
installation drawing. Bolt dia. 3/16” fasteners through heater box. Unit must be
installed in the vertical only, with the inlet and outlet at the bottom. The cold water
inlet is on the right hand side and the hot water outlet is on the left. Under no
circumstances can these be changed. Leave a minimum of 8” clearance above the
unit to facilitate heating element replacement.
STEP 2: Flush supply piping thoroughly prior to connecting to inlet unions. Connect outlet
union to piping leading to eyewash. Check for leaks.
STEP 3: ELECTRICAL CONNECTION: a 1-3/8” hole on the bottom of the unit is provided
for customer connection. Customer to supply 480VAC/3-phase/60Hz power in a
”Delta” configuration, including three power leads and a ground conductor, each
sized for the system’s maximum amperage of 24A. The customer is responsible for
providing a local fused disconnect switch or circuit breaker sized accordingly. The
maximum power draw of the system is 20 kW.
STEP 4: TEST FUNCTION OF UNIT
Turn on eyewash. Carefully monitor initial few minutes of flow with hand in
eyewash flow. Check to ensure initial flow does not contain brief shots of hot
water. See troubleshooting if any problems.
IMPORTANT: REPEAT TEST PROCEDURE WEEKLY!
3/15 Model TWBS.EW.H Page 4 of 6
TROUBLESHOOTING
PROBLEM
REPAIR CHECKLIST
1. Cold water leaving heater. 1. a. Ensure unit is wired to proper breaker
and wire size.
b. Ensure flow through heater is sufficient
c.
to activate flow switch. Minimum turn-on
flow rate of .95 gpm is required.
Too much flow through heater; unit is
designed to handle a maximum of 6.0
gpm.
2. Output too hot. 2.
If high limit shut-off valve is constantly
closing, consult factory for additional
help.
REPLACEMENT PARTS
DESCRIPTION
Temperature Gauge, 1/2”
QUANTITY
1
Heater
Bypass Valve, 1/2"
Hot Shut-off Valve, 1/2”
1
1
1
For more information about Haws products, see our website: www.hawsco.com.
© 2015 Haws
HAWS
3/15 Model TWBS.EW.H Page 5 of 6
®
®
Corporation – All Rights Reserved
and other trademarks used in these materials are the exclusive property of Haws Corporation.
C
Haws Corporation - All Rights Reserved.
2016
MAKE SPECIFICATIONS AND MEASUREMENTS SUBJECT TO CHANGE WITHOUT NOTICE.
THIS DOCUMENT IS TRUE AND CORRECT AT TIME OF PUBLICATION. CONTINUED PRODUCT IMPROVEMENTS
3. DIMENSIONS MAY VARY BY:
± 1/2" [12.7mm].
ON ALL WATER CON NECTIONS .
HAWS and other trademarks used in th ese materials ar e the exclusive property of Haws Corporation.
R
44mm
1-3/4"
2. USE TEFLON THREAD SEAL TAPE
1. CAUTION: THIS UNIT IS INTENDED
"FOR INDOOR USE ONLY"
(NOT SUPPL IED)
EYEWASH
MINIMUM CLEA RANCE
TEMPERATURE
GAUGE
SHUTOFF
VALVE
HOT
25mm
MOUNTING
HOLES
4.8mm
3/16"
4X
1"
ABOVE UN IT
203mm
8"
NOTES:
184mm
7-1/4"
267mm
APPROVED:
DRAWN:
4796
RTM
FV
REVISED PER
ECN:
DATE:
04/30/04
4909
DATE:
06/14/16
CHK'D.:
BY:ECN NO.
VWC
FV
SCALE:
MODEL(S)
1:10
DRAWING TYPE: SIZE: A
25mm
1"
POWER IN
(INLET & OU TLET)
(NOT SUPPLIED)
TWBS.EW.H
.
INSTALLATION
DIELECTRIC
1/2" IPS
UNION
50 MICRON
FILTER
PRESSURE
BYPASS
VALVE
10-13/16"
275mm
879mm
34-5/8"
INTENDED
(CAUTION:THIS
UNIT IS
FOR INDOO R
ONLY)
USE
10-1/2"
311mm
12-1/4"
3 PHASE
HEATER
480VAC
20kW
387mm
OR PERMANENT DAMAGE TO
15-1/4"
IN THE VERTICAL POSITION
UNIT MUST BE INSTALLED
UP
THE HEATER WILL RESULT
152mm
6"
108mm
4-1/4"
0002080380.D
PART NUMBER
REVISION
SHEET OF
11
11
(775) 359-4712 FAX (775) 359-7424
E-MAIL: HAW S @ HA WSCO.COM
WEBSITE: WWW.HAWSCO.COM
SPARKS, NEVADA 89431
1455 KLEPPE LANE
PAGE
6 OF 6
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