24
1- ANNUAL MAINTENANCE
A- Flueway
• Must be examined annually.
•
Examine flueway by removing the vent
pipe, jacket and flue collector from the
top of the combination heater.
- If cleaning is necessary, remove the
flue baffles and burner,
- Sweep with a flue brush or any wire
scratch brushes.
- Remove any particulate that may have
fallen into the combustion chamber
before replacing the burner.
•
Reinstall the flue baffles and flue
collector.
•
Examine the vent system for any
obstruction to the flow of combustion
or ventilation air and for deterioration
or damage which could cause leakage
of flue gases or improper venting.
•
Clean, repair or replace as required.
B. Pressure relief valve and T&P relief
valves
Manually operate the pressure & T&P
relief valves at least once a year. This
will release some hot water.
Before manually operating either pressure
or T&P relief valve check that the dis-
charge is directed to a suitable place for
disposal. The discharge line must be full
size, without restriction and installed to
permit complete drainage of both the
valve and line.
T&P relief valve
•
Located on the center rear top of the
heater. (see Fig. 22 page 29).
• Lift the lever handle and permit water to
discharge for several seconds.
•
If after closing the valve, the valve fails to
completely reset and water continues to
flow, shut OFF power to the heater and
follow the draining procedure. Partially
drain the inner tank and replace the T&P
relief valve.
•
If T&P weeps periodically, it may be
due to thermal expansion (see Thermal
Expansion page 9.)
Pressure relief valve
•
Located on the left rear top of the outer
primary tank. (see fig: 22 page 29)
•
Shut OFF the power to the heater.
•
Lift the lever handle to permit water to
discharge for several seconds.
•
After closing the valve, if some water
continues to flow, shut OFF the two iso-
lation valves separating the combina-
tion heater from heating system.
Partially drain the outer tank and
replace the pressure relief valve.
Water from opened drain valves, unions
and other connections may be extremely
hot. To avoid personal injury, death or
substantial property damage;
- Tighten all drain hose connections
- Direct hot water away from all
persons
C. Antifreeze
•
The outer (primary) tank is compatible
with inhibited propylene glycol solu-
tion with a maximum a 50/50 mix.
•
Primary water (including additives)
must be practically non-toxic, having
toxicity rating or class of 1, as listed in
the Clinical Toxicology of Commercial
Products.
WARNING
WARNING
COMBINATION HEATER MAINTENANCE
