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AHE Series 4 Direct Vent Wall-Mounted Boilers — Boiler Manual
11b
Service and maintenance — annual start-up
o
Check/test
Gas piping
1.
Sniff near floor and around boiler area for any indication of a gas leak.
2.
Test gas piping using bubble test, per Manual Section 5, page 18, if
there is any indication of a leak.
Cold fill and operating pressures
1.
While the system is cold, note the pressure reading on the boiler
pressure/temperature gauge. Verify that cold fill pressure is correct.
2.
Watch the pressure as the boiler and system heat up to ensure pressure
rise is normal. Too high a rise would indicate a waterlogged or
undersized expansion tank.
Air vents and air elimination
1.
Inspect automatic air vents. Also inspect air separators to ensure they
are operational.
2.
The cap must be unscrewed one turn to allow air to escape.
3.
See Figure 23. If the air vent is leaking, remove cap "A" and briefly push
valve "B" and then release to clean the valve seat.
4.
Replace cap "A" by twisting all the way onto valve "B" and then unscrew
one turn.
Blower motor assembly
Blower develops induced draft to supply combustion air to boiler. Cooling
fan circulates air for controls contained within the jacket. Assembly includes
120/601, 3250 RPM, 1 Amp. blower motor, blower fan and cooling fan. See
Figure 30, item 21 on page 42.
Check and test the blower motor assembly to ensure it is operating correctly.
Replace, if necessary, per the following instructions:
1.
Remove white pressure switch tube from blower mounting plate.
2.
Disconnect (2) black wires from junction box to blower motor at wire
nuts.
3.
Remove (3) #10 x ½" Phillips screws from blower backing plate.
4.
Break silicone seal and remove entire blower assembly.
5.
Remove excess silicone sealant from mounting and backing plates.
6.
Reseal around blower backing plate with silicone sealant, including
the covers.
Boiler must be sealed gas-tight. Failure to do so can cause
flue gas spillage and carbon monoxide emissions,
resulting in severe personal injury, death or substantial
property damage.
7.
Start screw closest to wall.
8.
Install new blower motor assembly by sliding over back screw. Replace
other screws and tighten. Make sure blower motor outlet is sealed gas-
tight against gasket on mounting panel.
Failure to seat outlet gas-tight can cause flue gas spillage
and carbon monoxide emissions, resulting in severe
personal injury, death or substantial property damage.
9.
Connect wires on new blower motor to (2) black wires from junction
box. Use wire nuts.
10. Reattach white pressure switch tube to hose barb on blower mounting
plate.
30
Circulator with mixing valve
The circulator provides forced water circulation to hot
water heating system. The mixing valve prevents
condensation in the boiler.
Check and test the circulator to determine proper
operation. If replacement is necessary, use the following
instructions:
1.
Replace cartridge (Figure 24, item 1):
a.
Remove casing screws.
b.
Replace cartridge per manufacturer's
instructions.
c.
Replace casing screws.
2.
Replace mixing valve element (Figure 24, item 2):
a.
Follow manufacturer's instructions provided
with replacement.
Figure 23 Automatic air vent, typical
A
B
71036
Figure 24 Circulator with mixing valve
2
Part number 550-141-887/0800
1
88735
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