AERCO Packaged WaterWizard Steam-to-Water Heater - Manual (Page 29)

1B+ II Water Wizard Water Heaters
HE-110
Installation, Operation & Maintenance Manual OMM-0063_0C
MC2: 07/26/13 Page 29 of 50 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288
NOTE:
The procedures in the following paragraphs are arranged to isolate, disconnect
and disassemble the unit to the extent necessary to repair or replace defective
items. These procedures should be performed in the order specified to minimize
repair time.
10.2. ISOLATING THE HEATER
To isolate the Heater from all facility energy sources (steam, water, electrical, etc.), proceed as
follows:
Isolating the Heater Instructions
1) Disconnect and Lock-Out/Tag-Out external AC power supplied to the Control Box and any
other devices connected to the Heater.
2) Using a voltmeter, check to ensure that all incoming voltage readings are zero Before
continuing.
3) If the Heater is equipped with a Pneumatic Steam Valve, close the valve supplying air inlet
pressure to the Pneumatic Controller.
4) Close all stop valves in the Steam Inlet and Condensate Outlet lines
5) On the water-side, close the stop valves in the following order:
• Hot water outlet line
• Recirculation line
• Cold water inlet line
6) Carefully open the Relief Valve located on the Top Head to relieve pressure in the Heater
Shell. Water should stop flowing from the valve within one minute. If water continues to
flow from the Relief Valve, one of the water stop valves is not securely closed.
7) While holding the Relief Valve open to prevent creating a vacuum in the Shell, open the
Drain Valve in the Bottom Head on the Heater. Completely drain the potable water from the
Heater.