OM-NGB/3 11
Cleaning
WARNING
WATER AND VALVES MAY BE VERY HOT,
AND MAY CAUSE BURNS. PROTECT HANDS
FROM HOT SURFACES AND WATER.
Whenever the boiler is turned off and allowed to cool to about 170ºF, it drains
automatically. This should be done every day to minimize scale buildup inside the
boiler.
In addition to this draining, however, the following cleaning procedure should be
followed using a regular schedule. This will prevent the accumulation of lime on the
water level probes and interior surfaces of the boiler. The actual time between these
scheduled cleanings depends on the water quality and hours of operation. Minimally,
Groen recommends cleaning the boiler at least once each month.
A. Suggested Tools
a.
1/2” hardened square wrench extension
b. Pipe Joint compound (approved for 300ºF steam)
c. 32 oz. Groen Delimer Descaler (PN
114800),
or equivalent
d. Groen Spray Degreaser (PN 114801, or equivalent
e. Nylon pad(s)
B. Procedure
1. Turn the boiler on/off switch to the OFF position.
2. Slowly open the manual drain valve to empty the boiler. The valve is located
under the boiler.
3. Close the manual drain valve.
4. Turn off water supply to the boiler.
5. Allow the boiler to cool. This takes several hours, so it is recommended that
you cool the boiler overnight.
6. Turn on/off switch to “ON” to close the automatic drain valve.
7. Using a 1/2” hardened square wrench extension, remove one of the 1” NPT
pipe plugs from the front of the boiler.
8. Pour 32 ounces of de-limer (Groen Delimer Descaler - Part Number
114800),
or equivalent) into the boiler.
9. Replace the pipe plug. Use pipe joint compound, and tighten the plug
securely.
10. Turn on water supply to allow water to fill the boiler.
11. When the reset light appears, press the START switch.
12. Allow boiler pressure to develop. Let it stand for approximately 15 minutes
after pressure has built up. A badly limed unit may require more than 15
minutes.
If there are no steamer cavities or compartments with this boiler, proceed
to step 19.
The manual drain valve is
located under the boiler.
WARNING
USE SAFETY GLASSES AND RUBBER
GLOVES AS RECOMMENDED BY DE-LIMING
AGENT MANUFACTURER.
CAUTION
DO NOT USE A CLEANING OR DE-LIMING
AGENT THAT CONTAINS SULFAMIC ACID
OR ANY CHLORIDES, INCLUDING
HYDROCHLORIC ACID (HCL). IF THE
CHLORIDE CONTENT OF ANY PRODUCT IS
UNCLEAR, CONSULT THE MANUFACTURER.
