AERCO Packaged WaterWizard Steam-to-Water Heater - Manual (Page 24)

HE-110
1B+ II Water Wizard Water Heaters
OMM-0063_0C Installation, Operation & Maintenance Manual
Page 24 of 50
MC2: 07/26/13 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288
CHAPTER 8. CORRECITVE MAINTENANCE
Refer to table in TROUBLESHOOTING, Chapter 7 for a description of problematic symptoms.
The following are probable causes and remedies for improper function of the Heater.
1. The temperature gage or steam pressure gage, or the Steam supply pressure gage
ahead of the Control Valve, may be wrong. Check each with a gage which is known to
be correct.
2. Steam pressure is too low. Check the steam supply pressure gage ahead of the
Control Valve. If the reading is low, adjust the steam supply pressure to that which is
required. If there is a restriction in the steam supply line, the gage reading will drop
excessively when the Heater calls for full steam even though the pressure appears to be
normal when the load is light. If the steam supply pressure is correct, the steam gage
(below the Control Box) reading should reach design pressure for steam in the coils as the
Heater temperature drops. If it does not, check the operation of the Control Valve.
3. Cold Water pressure is low. Check and correct, if necessary, the Water pressure to the
Heater.
4. Static pressure of the Cold Water is too high. Make the necessary corrections to bring
the Water pressure below that for which the Relief Valve(s) is set.
5. Water to be heated is preheated too hot. Reduce the preheating to a temperature at least
10°F under the desired Heater hot water outlet temperature.
6. Condensate return piping has not been installed so that the Condensate drains freely
by gravity and/or the Condensate check valve leaks or has failed. If necessary,
rearrange the Condensate return piping per Step 6e under INSTALLATIION, Chapter 3.
Inspect the check valve and replace it if it is leaking or has failed. Also, check to make sure
there is no restriction in the Condensate drain line.
7. Steam supply line is not properly trapped. Install trap as indicated in Figure 2, 3, 4, or 5.
8. Leaking stop valve in bypass line, if any, around the Steam Control Valve. Maintain
the stop valve to shut tight.
9. Lack of expansion tank in the hot water system. Install an expansion tank in the outlet
hot water line close to the heater.
10. Insufficient shock absorbers. Insert shock absorbers (water hammer arresters) in both
the cold and hot water systems as needed to eliminate shock waves.
11. The Steam Control Valve does not close. Check the instructions covering the Valve.
12. The Steam Control Valve does not open. Check the instructions covering the Valve.
13. The temperature control thermal element (connected to the air-operated
Temperature Controller or the self-contained Control Valve and located in the Heater
top head) has failed. Refer to the instructions covering the Temperature Controller or
Control Valve.
14. The Anticipator Unit system is not operating properly. Check to make sure that the
temperature sensing element has not failed (see Item 13, above), that the shunt tube (item