)
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
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.
01/14 Model TWBS.EWE Page 2 of 6
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
Valve operation:
Hot and cold water flows into the valve through two ports, marked “C” for cold and “H” for hot. The inlet
water passes through check valves and valve seats into a mixing chamber, where the main thermostat is
located. The temperature setting is controlled via the tempered water temperature adjustment screw
which is located at the front of the valve. (See Installation Drawing). If the inlet temperature fluctuates or
the pressure changes, the main thermostat moves an internal plunger which corrects outlet temperature
back to the initial setting. In the event of cold water failure, the main thermostat completely closes the hot
seat. Additionally, the cold water by-pass valve provides adequate cold water flow if the hot inlet fails. For
additional safety, a second high temperature limit thermostat is located in the outlet stream. This
thermostat shuts off at 95° F or higher temperatures, closing the hot inlet.
Valve installation instructions:
Installation and field adjustment of this device are the responsibility of the
installer and shall be carried out in accordance with the following instructions:
1. This valve must be accessible for testing, adjustment and/or maintenance in its installed position.
2. If shutoff valves are installed for maintenance purposes, provisions shall be made to prevent
unauthorized shutoff.
3. Flush the hot and cold supply lines prior to installation.
4. Connect the hot and cold supplies to the marked inlets.
5. Connect the outlet to the tempered water supply line.
6. Pressurize the emergency tempering valve and check all connections for leaks.
Installation test procedure:
1. Confirm the discharge temperature at the eyewash station. Reset the outlet temperature, if
necessary, based on medical/safety authorities guidelines. (This establishes the pre-set level).
Note: Turning the temperature adjusting screw counterclockwise wil l increase the temperature.
2. Close the hot water supply: The cold water by-pass must ope n and provide significant flow.
3. Open the hot water supply: The outlet temperature should return to the pre-set level.
4. Close the cold water supply (Do not use the check valve.): The flow rate must comply with the
maximum cold shut off flow allowed by ASSE 1071 for this valve size.
5. Open the cold water supply: The outlet temperature should return to the pre-set level.
Recommended valve testing procedure:
1. Open the eyewash station: Confirm and record the outlet temperature.
2. Close the hot water inlet: The cold water by-pass valve must open.
3. Open the hot water inlet: The outlet temperature should return to the pre-set level.
4. Close the cold water supply (Do not use the check valve.): The flow rate must comply with the
maximum cold shut off flow allowed by ASSE 1071 for this valve size.
5. Open the cold water supply: The outlet temperature should return to the pre-set level.
01/14 Model TWBS.EWE Page 3 of 6
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
TROUBLESHOOTING PROCEDURE
PROBLEM CONDITION REPAIR CHECKLIST
a.
1. Cold flow only.
Confirm the hot water inlet pressure; it must be within +/10% of the cold inlet pressure.
b.
Confirm the hot water check-stop and/or upstream valve
is fully open.
c.
Confirm the hot inlet check-stop screen is free of debris.
Clean if necessary.
2. Flow rate is too low.
3. No flow.
4. Significantly lower outlet
temperature.
a.
Confirm all upstream inlet valves are fully open.
b. Confirm the downstream valve is fully open.
c.
Confirm the hot and cold inlet pressures; both supplies
must be 30 PSI, minimum.
d.
Confirm both the check-stops are free of debris. Clean if
necessary.
a. Confirm all upstream inlet valves are fully open.
b. Confirm the downstream valve is fully open.
c.
Confirm the hot and cold inlet pressures; both supplies
must be 30 PSI, minimum.
d.
Confirm both the check-stops are free of debris. Clean if
necessary.
a. Confirm the hot water inlet pressure; it must be within +/-
10% of the cold inlet pressure.
b. Confirm the cold water bypass valve is free of debris.
Clean if necessary.
01/14 Model TWBS.EWE Page 4 of 6
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
WEEKLY TEST RESULTS (ONE YEAR)*
WEEK
NO.
(1 THRU
26)
1
2
3
4
5
6
7
8
9
10
11
12
OUTLET
TEMP
(° F)
COLD
BY-
PASS
OPEN?
(Y/N)
COLD
WATER
FAILURE?
(PASS/FAIL)
WEEK NO.
(27 THRU
52)
27
28
29
30
31
32
33
34
35
36
37
38
OUTLET
TEMP
(° F)
COLD
BY-
PASS
OPEN?
(Y/N)
COLD
WATER
FAILURE?
(PASS/FAIL)
13
14
15
16
17
18
19
20
21
22
23
24
25
26
*Notice to testing personnel: This sheet should be used as a template for capturing the test
results of this valve for one year. Please make a copy of this sheet for future tes ting prior to
© 2014 Haws
HAWS
®
and other trademarks used in these materials are the exclusive property of Haws Corporation.
writing on this one.
®
Corporation – All Rights Reserved
39
40
41
42
43
44
45
46
47
48
49
50
51
52
01/14 Model TWBS.EWE Page 5 of 6
Haws Corporation - All Rights Reserved.
2014
HAWS and other trademarks used in these materials are the exclusive property of Haws Corporation.
MAKE SPECIFICATIONS AND MEASUREMENTS SUBJECT TO CHANGE WITHOUT NOTICE.
C
THIS DOCUMENT IS TRUE AND CORRECT AT TIME OF PUBLICATION. CONTINUED PRODUCT IMPROVEMENTS
2 3/4
HIGH TEMPERATURE VALVE
R
MAIN TEMPERING VALVE
ACCESS SCREE N)
(REMOVE CAP TO
CHECK STOP
HOT WATER
TEMPERED WATER
TEMPERATURE
ADJUSTMENT SCREW
HOT WAT ER INLET
1/2" NPT(F)
6 1/2
APPROVED:
DRAWN:
4303
VWC
REVISE D PER
ECN:
DATE:
9/2/10
4887
DATE:
BY:ECN NO.
CHK'D.:
HM
SCALE:
MODEL(S)
1:4
DRAWING TYPE: SIZE: A
TWBS.EWE
ACCESS SCREEN)
6 3/4
(REMOVE CAP TO
1/2" NPT(F)
COLD WATER
CHECK STOP
COLD WATER INLET
2 1/4
4 1/2
3/4" NPT(F)
TEMPERED W ATER OUTLET
INSTALLATION
0002080230.D
DRAWIN G NO.
PART NUMBER
SHEET OF
16050A 5
11
REV
(775) 359-4712 FAX (755) 359-7424
E-MAIL: HAWS@HAWSCO.COM
WEBSIT E : WWW.HAW SCO.COM
SPARKS, NEVADA 89431
145 5 KLEPPE LANE
3"
PAGE
6 OF 6
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