24
Lighting and Operating instructions are included with this manual.
By using these instructions, the user may be able to make minor
operational adjustments and save unnecessary service calls.
However the user should not attempt repairs, but should contact
a service technician or gas supplier.
GENERAL
Never operate the boiler without first making sure the boiler and
system are filled with water, in addition:
For hot water supply installations:
• Make sure a temperature and pressure relief valve is installed
at the boiler and, if used, the storage tank. Also check for
leaks.
For heating boiler installations:
• Make sure that the boiler and system have been purged of air
and checked for leaks.
Also be sure to check the gas piping for leaks before beginning
the initial firing of the boiler.
FILLING AND PURGING FOR HEATING
BOILER INSTALLATION
1. Fast fill system through bypass until pressure approaches
desired system pressure. Close bypass valve and permit
pressure to be established by the pressure reducing valve.
2. Vent all high points in system to purge system of air.
Provisions should be made to permit manual venting of radiators
or convectors.
FILLING FOR HOT WATER SUPPLY
BOILER INSTALLATION
1. Close the systems drain valve by turning handle clockwise.
2. Open a nearby hot water faucet to permit the air in the system
to escape.
3. Fully open the cold water inlet pipe valve allowing the heater
and piping to be filled.
4. Close the hot water faucet as water starts to flow.
5. The heater is ready to be operated.
PURGING OF GAS LINE
Gas line purging is required with new piping or systems in which
air has entered.
CAUTION
PURGING SHOULD BE PERFORMED BY PERSONS EXPERIENCED
IN THIS TYPE OF GAS SERVICE TO AVOID RISK OF FIRE OR
EXPLOSION. PURGE DISCHARGE MUST NOT ENTER CONFINED
AREAS OR SPACES WHERE IGNITION CAN OCCUR. THE AREA
MUST BE WELL VENTILATED AND ALL SOURCES OF IGNITION
MUST BE DEACTIVATED OR REMOVED.
BEFORE PLACING THE BOILER IN OPERATION, CHECK FOR GAS
LEAKAGE. USE A SOAP AND WATER SOLUTION OR OTHER
MATERIAL ACCEPTABLE FOR THE PURPOSE OF LOCATING GAS
LEAKS. DO NOT USE MATCHES, CANDLES, FLAME OR OTHER
SOURCES OF IGNITION FOR THIS PURPOSE.
WARNING
THE GAS VALVE MUST HAVE BEEN IN THE OFF POSITION FOR AT
LEAST 5 MINUTES. This waiting period is an important safety
step. Its purpose is to permit gas that may have accumulated
VERIFY PROPER OPERATION AFTER SERVICING. STRICT
ADHERENCE TO THE WIRING DIAGRAMS IS REQUIRED TO
PREVENT CONSTANT PUMP OPERATION WHEN THE SYSTEM
CONTROLLER IS SATISFIED. OTHERWISE THE WARRANTY IS
VOID AS STIPULATED IN THE LIMITED WARRANTY IN THIS
INSTALLATION MANUAL.
IF ANY OF THE ORIGINAL WIRE, AS SUPPLIED WITH THE
APPLIANCE, MUST BE REPLACED, IT MUST BE REPLACED
WITH TYPE 105°C WIRE OR ITS EQUIVALENT.
The LEGEND 2000
®
must be connected to a single phase
independent line source that is:
NOTE: For proper boiler performance, it is important that the
Legend 2000
®
is on its own separate breaker. Do not put other
appliances on the same breaker as the boiler.
There are five (5) electrical connections that must be made for
the unit to operate correctly:
1. BLACK (No Stripe) 120V HOT
2. WHITE 120V NEUTRAL
3. GREEN GROUND
4. (2) TANK PROBE OR (2) RED/GREEN 24V THERMOSTAT.***
*** Either the tank probe or the 24V thermostat connections are
to be made, but not both.
These connections shall be made at the rear of the unit where a
junction box is provided. AN ELECTRICAL GROUND IS REQUIRED
TO REDUCE THE RISK OF ELECTRIC SHOCK OR POSSIBLE
ELECTROCUTION. A GROUND SCREW IS PROVIDED IN THIS
JUNCTION BOX.
NOTE: On LW models the control board comes preset for the
Tank Probe provided with the unit. Blue wires are run from the
Control Board to the power strip at the rear of the unit. The
connection of the Tank Probe should be across the L3 and L4
terminals. If the installer wishes to use an alternate 24 volt
method of temperature control (thermostat, Aqua-stat, etc.),
the connections need to be made to the Red/Green wires, also
at the rear of the unit. The J33 jumper on the Control Board
must be removed to use an alternate 24 volt temperature
control.
NOTE: Tank probes are not provided on LB models, it is required
that a system/operating temperature controller (field supplied)
be installed to regulate loop and system temperatures. Two
24 Volt Red/Green wires are provided in the rear junction box
for this connection. Do not operate this boiler without system
or operating control.
DO NOT
connect both sets of wires to a control. If the Tank Probe
is being used, cap securely the Red/Green wires at the junction
box. Do not connect the Red/Green wires together.
NOTE: If a system pump is to be installed on a Legend LB model,
the maximum rating of the pump motor must not exceed 1 hp.
Refer to the Connection Diagram (figure 16) and to the
Schematic Diagram (figure 17).
OPERATION
IMPORTANT
Only qualified personnel shall perform the initial firing of the heater.
At this time the user should not hesitate to ask the start-up
technician any questions regarding the operation and
maintenance of the unit. If you still have questions, please contact
the factory or your local A.O. Smith representative.
120 Volts, 60 Hertz, 30 Amps
Содержание LB 1000
Страница 22: ...22 FIGURE 16 CONNECTION DIAGRAM ...
Страница 23: ...23 FIGURE 17 SCHEMATIC DIAGRAM ...
