AERCO KC1000 Boiler July 2011 - Manual (Page 55)

MAINTENANCE
7-5
7.6.1 PROPANE UNITS
For propane units it will be necessary to remove
the air mix assembly in addition to the
components outlined in Section 7.6. Proceed as
follows:
1. Follow steps 1 through 5 in paragraph 7.6.
2. Using a wrench, loosen the two
compression fittings holding the 1/4”
feedback tube between the burner and air
regulator and remove the feedback tube
(See Figure 7.9).
3. Using a 1-1/16” wrench or an adjustable
wrench loosen and remove the 12” flexible
gas hose.
4. Go back to paragraph 7.6 and continue at
Step # 6.
Figure 7.9
Propane Unit Component Location
NOTE:
Older propane units have a 1/8” feedback
tube and 1/8” OD tube compression fittings.
7.7 HEAT EXCHANGER WATER SIDE
INSPECTION
Per CSD-1, the water side of the heat exchanger
requires an inspection. To inspect the heat ex-
changer, proceed as follows:
1. Shut off AC power to the unit.
2. Close the supply and return valves to the
unit (Fig 7.10).
3. Open the drain valve and allow the unit to
fully drain. The 1/4 inch plug in the top of
the shell may be removed to aid in drainage
or the relief valve may be opened (Fig 7.10).
4. Remove the 2 ½ inch plug located in the
shell at the rear of the unit (Fig. 7.11).
5. Remove the relief valve, drain valve
(Fig. 7.10) and any reducing bushings.
6. Perform the inspection and reassemble the
unit once the inspection is completed.
7. Open the supply and return valves and
reconnect AC power to the unit.
RELIEF VALVE
DRAIN VALVE
REDUCING
1/4" PLUG
HOT WATER
HOT WATER
SUPPLY (OUTLET)
RETURN (INLET)
BUSHING
REDUCING
BUSHING
Figure 7.10
Heat Exchanger Supply and Return
Locations