9
installation
&
operation
manual
|
dlv
heating
system
2.6
MAIN POWER SUPPLY
WARNING
!
Hazardous voltage:
Before wiring, servicing or cleaning the heating system, turn off the power and follow
your organization’s lockout and tagout procedure. Failure to do so could allow others to turn on the power
unexpectedly, resulting in harmful or fatal electrical shock.
Electrical hazard:
All wiring shall be done by qualified personnel in accordance with national, state and
local codes. Each system shall be grounded in accordance with the National Electrical Code. Failure to
properly ground the system may result in electrical shock.
1.
Connect the specified power from the customer-supplied circuit breaker to the terminal blocks located
in the main control box.
OOE:
The specified power source must be within plus or minus 10% of the rated voltage.
OOE:
The circuit breaker must be near the heating system and easily accessible.
HOTSTART recommends
connecting the heating system to a circuit breaker rated for 125% of the system’s maximum load.
OOE:
The main power supply operates the heating elements and the circulating pumps. A transformer is used
to operate the control circuit. The transformer and control circuits are overload-protected.
h
For
three-phase applications
, the terminal blocks are labeled
L1
,
L2
and
L3
.
h
For
single-phase applications
, use the terminal blocks labeled
L1
and
L2
or
L
and
.
See Fig. 2
.
2.
Connect the main power ground wire to the ground lug or ground block on the electrical panel
located inside the electrical box.
Figure 2. The main
power supply terminal
blocks located in the
DLV control box.
Example shown is a
three-phase system.
Single phase terminal
blocks will be labeled
L1 and L2 or L and N.
The main power
ground wire must
be connected to the
ground lug or ground
block.
