GENERAL

 

NOTICE: READ THE GENERAL SAFETY SECTION OF YOUR OWNERS MANUAL BEFORE INSTALLING THIS UNIT.  IF YOU DON’T FOLLOW THESE SAFETY RULES, THE UNIT MAY NOT OPERATE PROPERLY AND COULD CAUSE, SERIOUS BODILY INJURY, PROPERTY DAMAGE AND/OR DEATH.

 

WARNING: HAZARD OF ELECTRICAL SHOCK! BEFORE REMOVING THE COVER OR INSTALLING THE UNIT, MAKE SURE THE ELECTRICAL SUPPLY TO THE WATER HEATER IS DISCONNECTED. FAILURE TO DO THIS COULD RESULT IN DEATH, SERIOUS BODILY INJURY, OR PROPERTY DAMAGE. DEPENDING ON YOUR INSTALLATION, IT MAY BE NECESSARY TO TURN OFF MULTIPLE BREAKERS TO COMPLETELY POWER DOWN YOUR UNIT.

PLUMBING

ELECTRICAL

 

  • Seisco tankless heaters are rated like ovens, dryers and tank water heaters when sizing for electrical panels.  A 40% load factor, or 40% of the rated load is used when sizing the panel.  Typically, a whole house Seisco heater will fit on existing panels of 150-200 Amps.  Seisco offers an optional interlock relay to allow the interlock of other resistance heat loads to avoid the expensive upgrade of the service panel.

 

  • Seisco 2 and 4 chamber models offer optional wiring methods that use fewer breakers.  Consult the Electrical Installation Guide for required installation of included jumpers for proper operation of the unit.

 

  • Consult the Seisco Product Guide for details on unit sizing, electrical and plumbing installation

          WHOLE HOUSE                              POINT OF USE                  SUPERCHARGER        SPACE HEATING

 

  • All Seisco models must be mounted with the plumbing connections at the top of the cabinet.  Point of Use models can be mounted horizontally or vertically with the fittings at the top.  IMPROPER INSTALLATION CAN CAUSE CATASTROPHIC DAMAGE TO THE UNIT AND VOID THE WARRANTY.

 

  • When mounting above the ground floor the addition of a pressure relief valve may be required. 

 

  • A drain pan should be used whenever the unit is installed in a location where a leak could result in property damage.  It should cover at least 2-3 inches of the bottom of the unit with a 1" or larger drain hole.

 

  • When two units are plumbed together they should be plumbed in paralell (See Piping Diagrams below).

 

  • A spring type check valve should be installed on the outlet if the plumbing design could result in reverse flow.  REVERSE FLOW CAN CAUSE DAMAGE TO THE UNIT and waste energy.

 

  • An automatic air eliminator should be installed on the inlet when the plumbing design results in excessive air in the lines.

 

  • A hammer arrestor should be used as required where water hammer exists to avoid excessive water pressure to the heater.

 

  • Match sizing of heater to flow rate of fixtures -- Use included flow restricting aerator with POU Models.  Consider replacing showerheads with water saving models to manage flow with whole house installations.   Flow rate can be measured with a quart or gallon bottle and a stop watch.

 

  • When selecting a tub valve for use with any tankless water heater, we recommend the use of a valve that controls volume (flow rate) as well as the standard temperature selection.