Haws TWBS.EW.H User Manual

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INSTALLATION, OPERATION

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MAINTENANCE INSTRUCTIONS

1455 Kleppe Lane Sparks, NV 89431-6467 [phone] Fax [phone]

E-mail: [e-mail] 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

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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.

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