Crown Mega-Stor 2 Installation Manual

18
VIII. MAINTENANCE
This indirect water heater (IWH) is an extremely simple device and as such requires very little maintenance. There are, however,
several items which should be checked out on an annual or as needed basis to ensure a safe reliable supply of hot water:
* If the indirect water heater is equipped with an anode rod, inspect the rod on an annual basis and replace if necessary.
This anode rod is located above the boiler supply on the MS2-030 and above the thermostat on the MS2-040 thru
MS2-075 as shown in Figure 2.2. To inspect it, drain the tank and then unscrew the rod. When new, it is approximately
¾” in diameter and 19” long. If it has lost more than half of its original size, or if the aluminum portion of the rod is no
longer securely bonded to the brass nut, replace the rod.
* Verify proper operation of the L4080B control.
* Make sure the boiler and domestic water piping is free of leaks.
* If there is an oil lubricated circulator in the system, make sure that it is lubricated as called for by the circulator
manufacturer.
FIGURE 7.1: TEMPERATURE CONTROL
APPROXIMATE TIME/TEMPERATURE
RELATIONSHIPS FOR SCALDING
120°F More than 5 minutes
125°F 1-1/2 to 2 minutes
130°F About 30 seconds
135°F About 10 seconds
140°F Less than 5 seconds
145°F Less than 3 seconds
150°F About 1-1/2 seconds
155°F About 1 second
TABLE 7.2: SCALD RISK
WARNING
The water in the tank is normally hot and under pressure. It may cause scald injuries if the anode rod
is loosened without removing pressure and draining the tank. Anode inspection and replacement
should only be attempted by a professional plumber or HVAC technician.
NOTICE
• Failure to inspect/replace the anode rod as prescribed above may cause premature failure of
the indirect water heater, which is not covered under warranty.
• The tapping for the anode rod is ¾” “G” thread, which relies on an “O”-ring for sealing. Use
only the anode rod shown in Parts section of this manual as a replacement. Do not apply
Teon tape, or other sealants, to the anode rod threads.