Hubbell ST, Руководство по эксплуатации и техническому обслуживанию

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3. All other electrical connections are made at the factory; therefore, no other
electrical connections are necessary.
FILLING THE HEATER
1. Begin with all steam, condensate, and water valves closed.
2. Open the isolation valves on the integral circulator line ,if supplied.
3. Open cold water valve, fill unit with cold water. Lift lever on relief valve to
relieve trapped air. Release relief valve lever when all traces of air have been
vented from the unit. Leave cold water valve open.
STARTUP
1. Turn pump switch to the “ON” position, if supplied. (Do not operate pump
without unit being filled with water and isolation valves being opened, as
damage to the pump could result).
2. Set control valve thermostat to approximately 30° F below desired temperature,
observe unit, if unit operates properly gradually raise set point to desired set
point.
3. If unit has a safety system, set hi-limit thermostat to desired temperature. (This
thermostat must be set at a higher temperature than the operating thermostat or
the unit will never reach the desired temperature). Refer to the enclosed piping
and wiring drawings.
Gradually open valve to allow heating medium to enter the heating element.
(Boiler water lines should be vented to eliminate trapped air). Monitor the tank
temperature until the desired temperature is reached. If the temperature
regulator shuts off before the desired temperature is reached, or if over-shoot
occurs, adjustment of the temperature regulator will be required. (Refer to
enclosed O&M manuals for your specific control valve).
4. After control valve adjustments have been made and the desired temperature
has been reached, open the valve on the hot water outlet and the building
recirculation line.
5. Tightening of some gasketed joints may be required after unit has been heated.
6. Never break any joint, gasketed or screwed on unit until the pressure in the unit
has been reduced to zero and the unit drained.
7. Observe operation of unit for 30-40 minutes after initial start up.
SHUTDOWN
1. Close valve to heating medium and air supply valve, if air operated controls are
furnished
2. Disconnect all electrical power to unit.
3. Close hot water outlet valve.
4. Close building recirculation inlet valve, and shut down building circulation pump.
5. Close cold water inlet valve.
6. Turn off pump, if supplied.
7. Drain unit by lifting lever on relief valve to vent tank, then slowly open drain
valve.
SECTION III -
SCHEDULED MAINTENANCE AND SERVICING
WARNING / CAUTION
Before performing any maintenance procedure, make certain steam supply and
electrical power supply is OFF and cannot accidentally be turned on.
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