Dhc 3-2, And Dhc 4-2 @ 208 V Electrical Connection; Terminal Block; Commissioning; Water Heater Handover - STIEBEL ELTRON DHC 3-1 Classic Operation And Installation

INSTALLATION

COMMISSIONING

7.1 DHC 3-2, and DHC 4-2
tion
A 3/8˝ diameter rubber grommet is supplied as part of the required
electrical installation with DHC 3-2 and DHC 4-2 Classic units.
1. When installing the DHC 3-2 Classic at either 208 or 240 V, or
the DHC 4-2 Classic at 208 V, first feed the 14 AWG wire through
the supplied rubber grommet. Prepare the wires according to
the diagram:
2.2˝ (56 mm)
A
2.2˝ (56 mm)
B
C
2. A ¾˝ Romex clamp (required, not supplied) should be installed
in the opening located between the hot and cold water con-
nections. The wire with the rubber grommet in place should be
fed through the Romex clamp. The "live" wires must be con-
nected to the slots on the terminal block marked L and L. The
ground wire must be connected to slot marked with the ground
symbol.
3. 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.
7.2

Terminal block

Consult the chart below for the recommended torque amounts on
the terminal block screws.
Screw Size (mm) Min. Torque (N•cm)
M5 150-200
Using the proper torque specifications to secure wire to the wiring
block helps to avoid personal loss or property damage.
WWW.STIEBEL-ELTRON-USA.COM
@ 208 V electrical connec-
3/8˝diameter
grommet
Min. Torque (lbf•in)
13.3-17.7
8. Commissioning
WARNING:
!
Open hot water faucet for a few minutes until water flow
is continuous and all air is purged from water pipes. The
unit's cover must be installed before the circuit breakers
are turned on.
1. Vent the air from pipes and the water heater by opening the
hot water faucet for a few minutes, until water flow is continu-
ous and all air is purged from the water pipes.
2. Turn on circuit breaker to bring electrical power to the unit.
3. Open hot water faucet to a degree so that water flow is typical,
i.e. until the water flow is the same as that encountered during
normal use.
4. Wait twenty seconds until temperature has stabilized. Then
check water temperature. If temperature is too low, the water
flow rate needs to be reduced. In order to do this, turn off
the unit's circuit breaker, remove the cover and turn the flow
adjustment screw shown in illustration clockwise ½ turn (180
degrees) See 9.1, "Flow adjustment screw", pg. 8. Then
reinstall plastic cover, turn on circuit breaker and check water
temperature. This procedure should be repeated until the de-
sired temperature is achieved. In case the water temperature
is too high, turn the flow adjustment screw counter clockwise
in the same manner until the desired temperature is achieved.
The arrows in the illustration refer to the water temperature.
5. In order to obtain temperature control at a single spout mixer-
type faucet, restrict cold water flow to faucet by partially clos-
ing the cold water shut-off valve under the sink until cold water
and hot water flow rates are approximately the same.
8.1

Water heater handover

Explain the functions of the water heater to the user. Draw special
attention to the safety information. Hand the operating and instal-
lation instructions to the user.
DHC CLASSIC | 7