Water Connections; Aerator Installation At Connected Faucet; Electrical Connection - STIEBEL ELTRON DHC 3-1 Classic Operation And Installation

INSTALLATION

WATER CONNECTIONS

6. Water connections
NOTICE:
!
Excessive heat from soldering on copper pipes near the DHC
Classic may cause damage.
The cold water connection to the unit must be disconnected
periodically in order to clean the filter screen. It is required
to use water connections that are easily detachable such as
braided steel flex connectors.
NOTICE:
!
Hard water or water with a high mineral count may dam-
age the unit. Damage to the unit caused by scale or a high
mineral count is not covered under the warranty.
1. All plumbing work must comply with national and applicable
state and local plumbing codes.
2. A pressure reducing valve must be installed if the cold water
supply pressure exceeds 150 psi (10 bar).
3. Make certain that the cold water supply line has been flushed
to remove any scale and dirt.
4. Install shut-off valve in cold water line as shown in illustration.
This allows the unit to be isolated for maintenance purposes.
5. Cold water connection (inlet) is on the right side of the unit, hot
water connection (outlet) is on the left side of unit.
6. Tankless water heaters such as the DHC Classic are not required
to be equipped with a Temperature and Pressure Relief Valve
(T&P). If the local inspector will not pass the installation with-
out a T&P, it should be installed on the hot water outlet side of
appliance.
7. The DHC Classic's hot water outlet is designed for connection
to copper tubing, PEX tubing or a braided stainless steel hose
with a ½˝ NPT female tapered thread.
8. The plumbing on the cold water inlet side needs to be such
that it can easily be removed to allow access to the inlet filter
screen. The easiest way to achieve this is to use a braided steel
flex connector. If soldering near the unit is necessary, please
direct the flame away from the housing of the unit in order to
avoid damage. Note that excessive heat from soldering near
the cold water inlet fitting may damage the plastic filter screen
located inside it.
9. When all plumbing work is completed, check for leaks and take
corrective action before proceeding.
6.1

Aerator installation at connected faucet

DHC 3-1, 3-2, and 4-2 Classic models ship with a 0.5 gpm pressure
compensating flow-reducer/aerator that must be installed on the
faucet the water heater is connected to. Failure to install the aerator
may result in lower water temperatures than desired.
6 | DHC CLASSIC
7.

Electrical connection

DANGER: Electrocution
Before beginning any work on the electric installation, be
sure that main breaker panel switches are "off" to avoid
any danger of electric shock. All mounting and plumb-
ing must be completed before proceeding with electri-
cal hook-up. Where required by local, state or national
electrical codes the circuits should be equipped with a
"ground fault interrupter."
The unit must be properly grounded in accordance with
state and local codes, or in absence of such codes, in
accordance with national electric code or the Canadian
electric code. Failure to electrically ground the product
could result in serious personal injury or death.
WARNING Electrocution
The connection to the power supply is only permissible
as a permanent connection in conjunction with a ¾˝
Romex clamp. Ensure the water heater can be separated
from the power supply by an isolator that disconnects
all poles with at least 1/8˝ (3 mm) contact separation.
1. All electrical work must comply with national and applicable
state and local electrical codes.
2. The DHC Classic should be connected to a properly grounded
dedicated branch circuit of proper voltage rating. In installa-
tions with several DHC Classic units, each unit requires an
independent circuit. Please refer to the technical data table for
the correct wire and circuit breaker size.
3. A ¾˝ Romex clamp (required, not supplied) should be installed
in the opening located between the hot and cold water con-
nections. The wire should be fed through the Romex clamp.
The "live" wires must be connected to the slots on the terminal
block marked N and L (DHC 3-1, 4-3, 6-3, 9-3 Classic only) or L
and L (all other versions). The ground wire must be connected
to the slot marked with the ground symbol.
2.2" (56 mm)
4. Reinstall plastic cover. When reinstalling, insert the top of the
cover into the rear housing first, then tilt the bottom into place.
Re-tighten the cover screw.
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