background image

9

INDIRECT FIRED WATER TANK

V    WIRING

general wiring requirements

Wiring must conform to National Electrical Code in U.S.A.,
C.S.A. C22.1 Canadian Electrical Code Part 1 in Canada,
and  any  other  national,  provincial,  state,  or  local  code
requirements having jurisdiction.

All line voltage wiring must be a minimum 18 gage.
A separate service switch for the water heater electrical cir-
cuit is recommended. This switch must not turn off the boil-
er or other components in the heating system.

IMPortant note:
all wire connections to “t-t” or “a-a” terminals on boil-
er control must be from an isolated circuit which does
not carry voltage from an external source. any compo-
nent which does not have isolated end switches must
not be used unless a relay is added with the dry con-
tacts wired to these terminals.

The Slant/Fin Indirect Tank heater operates in much the same

way  as  an  additional  heating  zone,  either  utilizing  the  same

circulator  as  household  heating  or  its  own  circulator.  The

heater temperature is maintained by the use of an immersion

type  aquastat.  The  aquastat  is  installed  into  the  immersion

well on the heater and secured by tightening the set screw or

clamp.

The  aquastat  operates  in  much  the  same  way  as  a

thermostat. When the temperature falls inside the tank the set

of contacts make (close) and when the temperature rises the

contacts break (open).

The  aquastat  should  be  tied  into  the  boiler  system  and

controls. When the tank calls for heat the aquastat contacts

close  and  signal  the  boiler  controls,  allowing  the  boiler  to

maintain  temperature  and  proper  operation  of  the  tank 

circulator.

Slant/Fin recommends the use of a priority control to help the

boiler  maintain  desired  temperature  and  satisfy  the  tank's

BTU requirements.

The Slant/Fin Indirect tank heater recovery ratings are based

on the boiler's ability to mainatain 180 degrees Fahrenheit. It

is  important  that  the  installer,  plumber  or  heating  technician

responsible  for  installing  the  heater,  make  certain  that  the

boiler capacity (BTU) is adequate to satisfy the heater's BTU

requirements.

 

 

 

 

 

 

 

 

   

 

 

 

 

 

 

is reversed through the tank coil (heat exchanger). The boiler water enters at the bottom of the coil and 
exits from the top of the coil.  At no time should live steam be used in the tank coil (heat exchanger).

 

 

DANGER

Water temperature over 125˚F. can

cause severe burns instantly or death

from scalds.

Children, disabled and elderly are at

highest risk of being scalded.

See instruction manual before setting

temperature at water heater.

Feel water before bathing or

showering.

Temperature limiting valves are

available, see manual.

Summary of Contents for HWT-120

Page 1: ...valve of the proper rating for the heater tank size is required Install a tempering device such as a mixing valve on hot water piping which feeds areas where high temperature water is not demanded When servicing this installation make sure drain con nections are tight and drain hose is directed away from all persons or areas where injury or damage can occur Contents Page I Safety 2 II Product Sele...

Page 2: ...he drain pan to a properly operating floor drain Relief Valve Requirements Caution To reduce the risk of excessive pressures and temperatures in this water heater install temperature and pressure protective equipment required by local codes It should be no less than a combination temperature and pressure relief valve certified by a nationally recognized testing laboratory that maintains periodic i...

Page 3: ...otential maximum usage Estimate of Peak Domestic Hot Water Usage Shower 20 x______________________ x_______________________ Bath 20 x______________________ x_______________________ Shaving 2 x______________________ x_______________________ Hands and Face Washing 4 x______________________ x_______________________ Hair Shampoo 4 x______________________ x_______________________ Hand Dish Washing 4 x_...

Page 4: ...35 54 5 8 42 20 20 40 1 4 33 7 8 10 7 16 10 7 16 10 7 8 13 8 7 8 8 7 8 10 1 4 8 7 8 14 14 26 26 116 118 232 333 124 143 243 355 449 576 737 1324 PHYSICAL SPECIFICATIONS CONNECTIONS NOTES 1 All fittings are female NPT thread connections except for domestic hot and cold on the HWT 120 2 HWT 120 supplied with adapter to increase from 1 male to 1 1 4 female for domestic hot and cold 3 HWT 120 has insp...

Page 5: ...the vicinity of this or any other appliance Controls on this appliance could ignite vapors causing an explosion PIPING 1 General a All plumbing must be in accordance with the requirements of the authority having jurisdiction b Use both thread tape and pipe dope on all mechanical connections c Zone valve if used and circulator must be sized to provide minimum flow rate specified in the table to the...

Page 6: ...Breaker Slant Fin recommends that a vacuum breaker be installed on the domestic piping to the heater The vacuum breaker protects the heater in the event that tank pressure falls below atmospheric pressure Temperature Pressure Relief Valve T P A T P is required on all heaters Install a T P valve long element type into the separate tapping designated for the T P Install temperature and pressure prot...

Page 7: ...K CONTROL TEMP PRESSURE RELIEF VALVE BALL VALVE CIRCULATOR ZONE VALVE CHECK VALVE DRAIN VALVE HOT WATER BOILER HOT WATER BOILER MULTIPLE TANK INSTALLATION IV INSTALLATION PIPING cont d PIPING TANK INSTALLATION Notes Thermal Expansion Tank is required whenever a backflow preventer or no return valve is present in the system Locate the Thermal Expansion Tank on the Domestic Cold water line between t...

Page 8: ... and C and observe boiler water level at the gauge glass making sure that it remains at its original level Fill the potable water side of the tank and purge air from tank by opening a hot water faucet When the power is switched on the tank aquastat will turn on pump F and when the temperature of the boiler falls below the set point the boiler will fire A A B C E D F G I H Water level STEAM BOILER ...

Page 9: ...n much the same way as a thermostat When the temperature falls inside the tank the set of contacts make close and when the temperature rises the contacts break open The aquastat should be tied into the boiler system and controls When the tank calls for heat the aquastat contacts close and signal the boiler controls allowing the boiler to maintain temperature and proper operation of the tank circul...

Page 10: ...zone 6 is switched to the priority setting and is actuated all other zones will stop operation until zone 6 is satisfied When zone 6 is not switched to priority all zones will oper ate independently Jumper Placement REMOVE the jumper between terminals ZC and ZR Connect terminal ZC to ZC terminal on the aquastat control Connect terminal ZR to ZR terminal on the aquastat control Confirm polarity is ...

Page 11: ...EMP CONTROL I INDIRECT TANK CIRCULATOR Operation When any thermostat calls for heat the appropriate circulator is energized and the isolated end switch X and X will start the boiler Priority Operation When zone 6 is switched to the priority setting and is actuated all other zones will stop operation until zone 6 is satisfied When zone 6 is not switched to priority all zones will oper ate independe...

Page 12: ...12 INDIRECT FIRED WATER TANK V WIRING cont d Figure 5 Wiring to a gas boiler with circulator zoning Figure 6 Wiring to an oil boiler with circulator zoning ...

Page 13: ...to simplify the wiring and provide priority on domestic hot water demand Zone valve zoning wiring See Fig 7 8 a Components must be wired to ensure that only the zone valve for each zone is powered on a demand for supply water from zone and that the circulator is powered on a demand from any zone b The transformer used to power the zone valves must be sized for the load of all the zone valves in sy...

Page 14: ...ve 3 Open the household hot water taps 4 Attach a hose to the drain valve located at the bottom of the heater and allow the heater to drain 5 Unscrew the anodes Two shiny 1 1 4 Hex Heads on front of tank EXAMINE THE ANODES AND REPLACE IF THE DIAME TER IS LESS THAN 40 inches 6 Replacement of the Anodes The use or P T F E tape is recommended to ensure watertight connection of the anodes Failure to i...

Page 15: ...ater having a defect or malfunction that results in a water leak from the outside jacket inner tank or heat exchanger as a result of normal use and service It is expressly agreed between Slant Fin Corp and the original residential purchaser that repair or replacement is the exclusive and sole remedy of the original purchaser Any claim under this warranty must be verified by an authorized Slant Fin...

Page 16: ...tion or defects and maintenance in the ordinary course 13 Components of an indirect fired water heater which are not manufactured expressly for Slant Fin Corp such components are subject only to those warranties if any given by their manufacturers Slant Fin Corp does not adopt and has no responsibility for those warranties 14 Any tank that does not have installed a new temperature and pressure rel...

Reviews: