27
MB Pool & spa heater
185, 265 & 405 Models
PILOT REMOVAL AND CLEANING
1. Disconnect pilot tubing, and wires from
gas
valve.
2. Remove pilot assembly from burner tray.
3. Remove pilot from bracket.
4. Remove pilot injector and clean with
wire or small brush.
CAUTION!
Do
not
enlarge hole in pilot orifi ce.
5. Reverse above procedure to re-install.
HEAT EXCHANGER REMOVAL
1. Shut water, gas and electricity off, close
valves and relieve pressure, remove relief
valve. Remove side inspection panels.
2. Remove top holding screws.
3. Remove draft diverter, lift and remove top
and
fl ue collector. Remove inspection
panels.
4. Loosen bolts and disconnect fl ange nuts
on inlet-outlet header, loosen union(s)
at gas pipe and slide boiler away from
piping until studs clear the header.
5. Lift heat exchanger straight up using
caution not to damage refractory.
6. Reverse above procedure to reinstall.
055, 105 & 155 Models
HEAT EXCHANGER REMOVAL
1. Shut water, gas, and electricity off, close
valves and relieve pressure.
2. Drain heat exchanger.
3. Loosen and remove fl ange bolts.
4. Remove fl ange and inlet/outlet pipes from
the
header.
5. Remove outdoor stackless top or indoor
stack top from unit.
6. Remove jacket top, fl ue collector, and
baffl es.
7. Remove upper front jacket panel, and
disconnect wires at toggle switch.
8. Remove capillary bulb from inlet/outlet
header.
9. Disconnect press switch tube from return
header.
10. Disconnect hi-limit wire from thermostat,
and pressure switch. Remove overheat
thermostat capilliary & phial.
11. Lift heat exchanger straight up from
combustion chamber, using caution not to
damage
refractory.
12. Reverse above procedure to re-install.
All Models
CONTROL IMMERSION WELL REPLACEMENT
1. Shut water off to heater and drain heat
exchanger.
2. Remove jacket top panel.
3. Remove old control well with bushing and
sleeve, with 7/8" wrench or socket.
4. Slip "o" ring gasket over control well and
install
in
header.
TUBE CLEANING PROCEDURE (Typical)
Establish a regular inspection schedule, frequency
depending on local water condition and severity of
service. Do not let the tubes clog up solidly. Clean
out deposits over 1.5 mm in thickness.
It is preferable to remove the heat exchanger and the
in/out header for better visibility through the tubes
and to be sure the ground-up lime dust does not get
into the system,
After reaming, mount the wire brush in place of the
auger and clean out debris remaining in the tubes.
Another method is to remove the heat exchanger,
ream tubes and immerse heat exchanger in non-
inhibited de-scale solvent.
Well Assembly
Olive
