Burnham MPC - Manual (Page 70)

70
WARNING
Exercise caution when handling phosphoric acid
and follow the instructions on container label.
Always use protective clothing and equipment
when working with/near chemicals.
i. Wire brushing of the probe is not recommended
as the soft platinum guard ring sandwiched
between the ceramic insulators may be damaged.
Care must be taken not to damage this ring in
any way or the useful life of the probe may be
shortened.
j. Clean the pipe threads of the probe to remove
old, hardened pipe dope and other foreign matter.
k. Apply a moderate amount of good quality pipe
dope to the pipe threads on the probe, leaving the
two end threads bare. Do not use PTFE (Teflon)
tape.
l. Screw the probe into the boiler tapping.
m. Mount the low water cutoff control on the probe.
n. Reconnect the control to probe wiring.
o. Fill the boiler.
p. Add boiler water treatment compound as needed.
q. Restore electric service to the boiler.
r. Fire burner to bring the water in the boiler to a
boil to drive off free oxygen.
s. BEFORE RETURNING BOILER TO
SERVICE: Follow the low water cutoff check
out procedure, see Section V, Paragraph E, Item
3.
2. FLOAT TYPE LOW WATER CUTOFF
During the heating season, if an external low water
cutoff is on the boiler, the blow off valve should
be opened once a month (use greater frequency
where conditions warrant), to flush out the sediment
chamber so the device will be free to function
properly.
Low water cutoffs should be dismantled annually by
qualified personnel, to the extent necessary to insure
freedom from obstructions and proper functioning of
the working parts. Inspect connecting lines to boiler
for accumulation of mud, scale, etc., and clean as
required. Examine all visible wiring for brittle or
worn insulation and make sure electrical contacts
are clean and that they function properly. Give
special attention to solder joints on bellows and float
when this type of control is used. Check float for
evidence of collapse and check mercury bulb (where
applicable) for mercury separation or discoloration.
DO NOT ATTEMPT TO REPAIR MECHANISMS
IN THE FIELD.
Complete replacement mechanisms, including
necessary gaskets and installation instructions, are
available from the manufacturer.
D. chEcK BURNER AND cONTROLs at least once
a year. See Section V, Paragraph E under Operating
Instructions for control checks. See Burner Manual
and Table XII for recommended burner tests and
adjustments.
E. LUBRicATE BOiLER cOMPONENTs according
to manufacturer’s instructions. Generally, this involves
the burner and circulator. This includes the type of
lubricant to use, frequency of lubrication, and points to
lubricate.
f. GENERAL MAiNTENANcE
cONsiDERATiONs
1. Keep radiators and convectors clean.
2. If a hot water radiator is hot at the bottom but not at
the top, it indicates that air has accumulated inside
and should be vented. To vent radiator, hold small
cup under air vent (located near top of radiator),
open vent until water escapes and then close.
3. If a large volume of water is added to the system, it
is advisable to heat the system to a high temperature
and vent again. This will make less venting
necessary during the winter.
4. Where an expansion tank is used, make sure that
neither the tank nor its drain pipe is exposed to
freezing temperatures. Never place valves in piping
leading to or from expansion tank.
5. Boiler and system cleaning will help assure trouble
free operation. See Section V, Paragraph F, under
Operating Instructions for procedure.
G. ATTENTiON TO BOiLER WhiLE NOT iN
OPERATION
WARNING
If boiler is not used during winter time, it must be
fully drained to prevent freeze damage.
1. Spray inside surfaces with light lubricating or
crankcase oil using a gun with an extended stem so
as to reach all corners.
2. Always keep the manual fuel supply valve shut off
if the burner is shut down for an extended period of
time.
3. To recondition the heating system in the fall season
after a prolonged shut down, follow the instructions
outlined in Section V - Operating Instructions.