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09/19 

      Model TWBS.EW.H 

Page 6 of 11 

 

 

 

 

 

ELECTRICAL HOOK-UP 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

This  heater  must  have  its  own  independent  circuit  using  four  wires;  three  live  and  one  earth 
ground, of the appropriate rating protected by the correctly rated three pole breaker. 

 

 

STEP  1:

  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 2: 

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! 

 

 

THIS UNIT MUST 

NOT

 BE CONNECTED IN STAR CONFIGURATION 

 
 

 

 
 

 
 
 
 

WARNING 

FAILURE TO GROUND THE SYSTEM MAY RESULT IN DEATH OR 

SERIOUS INJURY 

WARNING 

HAZARD OF ELECTRICAL SHOCK! BEFORE BEGINNING ANY WORK ON THE 

INSRALLATION, MAKE SURE THE ELECTRICAL SUPPLY TO THE HEATER IS TURNED 

“OFF”. FALIURE TO DO THIS COULD RESULT IN DEATH, SERIOUS BODILY INJURY, 

OR PROPERTY DAMAGE. 

WARNING 

WATER HEATERS EQUIPPED FOR ONE VOLTAGE ONLY: CHECK THE RATING PLATE 

ON THE FRONT OF THE UNIT. DO NOT USE THIS WATER HEATER WITH ANY 

VOLTAGE OTHER THAN THE ONE SHOWN ON THE MODEL RATING PLATE. FAILURE 

TO DO SO CAN RESULT IN DEATH, SERIOUS BODILY INJURY, OR PROPERTY 

DAMAGE. IF YOU HAVE ANY QUESTIONS OR DOUBTS CONSULT YOUR ELECTRIC 

COMPANY. 

 

Содержание TWBS.EW.H

Страница 1: ... DESIGN OR STRUCTURE OF THE WATER HEATER HAS BEEN ALTERED IN ANY WAYWHATSOEVER THE MANUFACTURER OF THIS WATER HEATER WILL NOT BE LIABLE FOR ANY DAMAGES BECAUSE OF FAILURE TO COMPLY WITH THE INSTALLATION AND OPERATING INSTRUCTIONS OUTLINED ON THE FOLLOWING PAGES IF YOU REQUIRE ANY HELP OR HAVEANY QUESTIONS RELATINGTO THE INSTALLATION OR PERFORMANCE OF THIS HEATER PLEASE CALL OUR TECHNICAL SERVICE D...

Страница 2: ...with 45 90 psi 3 6 ATM flowing pressure at supply inlet Cold supply temperatures should range from 35 F to 75 F 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 po...

Страница 3: ...uts 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 wa...

Страница 4: ...licated 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 stati...

Страница 5: ...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 Run water through the supply pipe to remove all debris from the pipe before connecting the heater Failure to do so c...

Страница 6: ... 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 THIS UNIT MUST NOT BE CONNECTED IN STAR CONFIGURATION WARNING FAILURE TO GROUND THE SYSTEM MAY RESULT IN DEATH OR SERIOUS INJURY WARNING HAZARD OF ELECTRICAL SHOCK BEFORE BEGINNING ...

Страница 7: ...s not achieve desired temperature please call technical services TROUBLESHOOTING SYMPTOM NO HEAT INDICATOR LIGHT OFF 1 ELECTRIC SUPPLY IS OFF Turn on the main circuitbreaker 2 NO OR LOW WATER FLOW Ensure that the minimum flow rate to turn on your heater is met 0 95 GPM Also check that the inlet filter screen is clear from any debris 3 WATER CONNECTIONS ARE REVERSED Cold water inlet right side hot ...

Страница 8: ...nit is connected to the voltage supply specified on the rating label on the front cover of the unit and no other 3 ELEMENT BURNED OUT TURN OFF THE MAIN BREAKER Repeat the steps from paragraph 4 above 4 THERMOSTAT ADJUSTMENT SCREW NOT TURNED UP Turn the thermostat adjustment screw clockwise in small increments until the indicator light remains on Take care not to force the screw past its stop posit...

Страница 9: ...09 19 Model TWBS EW H Page 9 of 11 ...

Страница 10: ...09 19 Model TWBS EW H Page 10 of 11 ...

Страница 11: ...OOR USE ONLY 3 DIMENSIONS MAY VARY BY 1 2 12 7mm 15 1 4 387mm 2 USE TEFLON THREAD SEAL TAPE ON ALL WATER CONNECTIONS DO NOT USE PIPE DOPE APPROVED DRAWN PART NUMBER SCALE SHEET OF REVISION DRAWING TYPE SIZE A BY ECN NO PAGE DATE DATE ECN REVISED PER CHK D Haws Corporation All Rights Reserved HAWS and other trademarks used in these materials are the exclusive property of Haws Corporation C R MODEL ...

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