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ELECTRICAL INSTALLATION GUIDE
Plumbing Installation
WARNING and DISCLAIMERS
- READ ALL of the following before installing any Seisco Water
Heater.
- Risk of electrical shock. Disconnect all power sources before servicing.
- Use EXTREME CAUTION when checking voltage of the Seisco Water Heater.
- Heating element sheaths are not grounded.
- Depending on the model being installed, the Seisco Water Heater is
designed to operate from a 208v or 240v 1 or 3 phase power mains, and must be installed
accordingly.
- Models RA-14 thru RA-28 require multiple power sources. When wired
directly to the breaker box, more than one double pole circuit breaker is required.
- Where required by Code, use a Quick Disconnect Breaker adjacent to the
Seisco Water Heater. Installer must be certain the main feeder wires are properly sized.
- Refer to your local electric and plumbing codes for additional
information.
Warranties are honored and supported with the following:
- Proof that installation and service has been performed by licensed and
qualified personnel.
- Unit has been installed to meet the current National Electric Code, as
well as any applicable local plumbing, electrical, heating and air conditioning codes.
- Installation has followed the Seisco guidelines as outlined below.
- There is no soldering of the unit directly to the water lines.
- Wiring from the Seisco Water Heater has been attached to the Main Power
Circuit Breaker Panel, as shown on the wiring diagram attached to the inside of the
unit’s cover.
- If using stranded wire, ensure all strands are in secure placement in the
terminal block. A loose strand in contact with the circuit board can either damage the
board or impair performance of the Seisco Water Heater.
- Pre-Power Check, Power Check and Operational Checks have been performed
as outlined below.
UNPACK
Parts included:
- Do not cut through the shipping carton with a sharp instrument.
- Stand unit upright (3/4" pipes up)
- Remove plastic wrap
- Remove front cover
- Look for mounting holes in the metal back plate (thru
the rubber feet)
- Hold unit in upright position
- Attach to wall with supplied screws or 1/4" or larger lag bolts,
minimum of 1-1/2" long
- Optional Items (may be needed, not included as standard)
- Temperature/Pressure Relief Valve
- Drain Pan
HEATER SUPPLY SIDE CONNECTION
Install the proper size circuit breaker (See Product Specifications). Be sure that the
unit is connected to power supply circuits in the following manner:
Models RA-1.5 through RA-11:
Attach one PAIR of wires within the unit at power circuit 1 (PC1)
International connections may be different Please consult Microtherm
Models RA-14 through RA-22:
Same as above PLUS
Attach a second pair of wires within the unit at power circuit 2 (PC2)
International connections may be different Please consult Microtherm
Model RA-28
Same as RA-14 through RA-22 PLUS
Attach a third and fourth pair of wires at power circuits 3 and 4 (PC3 and PC4)
Two additional breakers are required for power circuits 3 and 4 (PC 3 and PC 4).
International connections may be different Please consult Microtherm
PRE-POWER CHECK
After all electrical connections have been made, installer must make every effort to
verify a safe installation:
- All connections in the unit disconnect and/or circuit breaker panel are
secure.
- An adequate ground has been properly connected.
- Adequate size breakers have been installed properly.
- Remember: Breakers that are too large are more dangerous than breakers
that are too small.
- Run water through the unit until air is purged.
POWER CHECK
Perform ONLY AFTER the Pre-Power Check has been completed and the Seisco Water Heater
is filled with water.
Use EXTREME CAUTION when checking the voltage of the unit.
- Turn on Main Power Circuit Breakers
- Verify that the Seisco Water Heater’s POWER ON indicator and LIMIT
lights are illuminated.
- Check voltage available to each active power circuit by connecting a
voltmeter at power circuit 1 (PC1) between L1 and L2. (all L1's
should be at the same voltage)
- For models with multiple power circuits utilized, continue to check voltage at each
additional power circuit.
OPERATIONAL CHECKS
- Pick any sink
- Turn water on MEDIUM FLOW
- Allow water to run for a couple of minutes
- With the unit’s cover removed, verify with a clamp-on ampmeter that
there is electrical current through each heating element circuit.
TURN OFF faucets after verifying the above.
THERMOSTAT SETTINGS
Thermostat settings are factory preset to approximately 118 degrees F (47.7C) with a
control on the circuit
board. For other settings, always be cautious as hotter water is often unnecessary.
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