Haws TWBS.EWE User Manual

)

INSTALLATION, OPERATION

&

MAINTENANCE INSTRUCTIONS

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

E-mail: [e-mail] website: www.hawsco.com

No. 2080230 (5

Model TWBS.EWE

Tempered Water Blending System

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 three years 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 thermostatic mixing valve 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, 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 AUTHORIZED, PROVIDE D
OR GIVEN BY HAWS.

SHOULD YOU EXPERIENCE DIFFICULTY WITH THE INSTALLATION OF THIS
MODEL, OR REPLACEMENT PARTS, PLEASE CALL:

TECHNICAL SUPPORT:

LIMITED WARRANTY

1-800-766-5612

FOR CUSTOMER SERVICE: 1-888-640-4297

01/14 TWBS.EWE Page 1 of 6

INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS

Valve operating principle:

The Haws Corporation TWBS.EWE Emergency Valve thermostatically mixes hot and cold water to
provide a safe fluid supply for emergency eyewash equipment. The TWBS.EWE valve contains a
secondary high temperature limit valve to provide additional protection to the user in the event of main
tempering valve malfunction. Additionally, to ensure a fail-safe water supply for emergency eyewash
stations, a series of cold water by-pass valves open in the event of hot water pressure loss, or main valve
thermostat malfunction.

Valve features:

‐ Paraffin filled thermostats with industry leading response time.
‐ Tempered water: Temperature is factory set to 85°F (29°C).
‐ Tempered water: High temperature limit is factory set to 85°F (29°C).
‐ The over temperature valve is calibrated to shut off the hot water inlet flow when the outlet

temperature exceeds 95°F (35°C).

‐ Cold water by-pass valve opens if hot water fails.
‐ Actively suspends hot water flow when cold water supply is lost to protect against scalding.
‐ Cold water by-pass valves are closed during normal operation, regardless of flow rate.

Valve sizing:

The flow capacity table shown below contains discharge flow rates @ 85°F (29 °C) outlet temperature with
the valve tested under the conditions described by ASSE 1071.

Flow Capacity

Model No. Min flow

TWBS.EWE

* Denotes minimum flow rate without re-circulation.

1.0* GPM 5 GPM 7 GPM

5 PSI 10 PSI 20 PSI

Pressure drop across valve Cold water

40 PSI 45 PSI By-pass @ 30 PSI

14

GPM

15

GPM

10

GPM

10

GPM

30 PSI

12

GPM

Valve specifications:

‐ Maximum operating pressure: 125 PSI
‐ Minimum / Maximum hot water temperature: 120°F / 180°F (49°C - 82°C).
‐ Tempered water temperature adjustment range: 60°F – 85°F (15°C - 29°C)
‐ Compliance/Listings: ASSE 1071, NSF 61, California Lead Plumbing Law and applicable

sections of CSA B125.3.

IMPORTANT

To ensure the proper operation of the TWBS.EWE valve it is essential to:

‐ Properly size the valve for each application.
‐ Keep the outlet temperature set between 60°F and 85°F (15°C and 29°C).
‐ Haws recommends a weekly testing and recording of the outlet water temperature.

Failure to comply with installation and/or maintenance instructions could result in
valve failure.

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