COMET 145 – INSTALLATION/OPERATION MANUAL
5IM-OB-COM0-00
Mar/11
7
SMOKE TEST
Adjust air control until a clean and symmetrical flame with “0-1” smoke
is obtained and then open to “0” smoke.
CO
2
TEST
CO
2
should be 11 – 13% when burner is at “0” to trace smoke. If flame
will not clean up, replace nozzle.
TRIM BURNER AIR
Always leave burner set at “0” smoke with CO
2
reading about 1% of
CO
2
lower than the peak efficiency achieved with a smoke trace (e.g.
12% CO
2
should be set back 1% to 11%). This gives better allowance
for fuel and draft variations and maintains a better seasonal efficiency.
3.0 OIL TANKS & PIPING
Tank installation should conform to local requirements.
Install according to the applicable code. Minimize number of connections in suction line and
make all connections as tight as possible. Use a pipe joint compound suitable for oil on all
pipe threads. To reduce possibility of air leaks, tighten stem packing gland nut on any valves
installed in the suction line. Also, be sure the oil filter is tight, as filter gaskets often shrink.
Check for kinks in the oil lines as well as for possible air pockets and for loose connections.
Two filters as shown in Figure - 2 are recommended. Optional tank gauge protectors and
outlet protectors are available at your local dealer.
ONE PIPE SYSTEM
Where the tank is above the burner and when the oil flows by gravity
to the oil pump, a single-stage fuel unit with a single oil line to the
pump may be used.
TWO PIPE SYSTEM
When single line is unsuitable, use double line or see your dealer for
special oil line fittings.
4.0
BOILER RETURN WATER TEMPERATURE
Steel boilers are very susceptible to corrosion caused by condensation of flue gases. In order
to prevent this, the return water temperature must not fall below 140°F. Most hydronic
systems are designed for a delta T of 20°F. Therefore, the low limit should be set at no lower
than 170°F, which accounts for the -10°F differential of the triple aquastat. Heating systems
that require lower temperatures such as cast iron radiators and radiant systems require some
form of mixing device to ensure the return water is at or above 140°F.
The warranty will not be valid for steel boilers with return temperatures below 140°F.
For more information refer to B214-01 Installation Code for Hydronic Heating Systems
(or equivalent).
5.0 CABINET
ASSEMBLY
See Figure – 6
BOILER WRAP
Wrap boiler with insulation, foil side out and secure with foil tape provided.
Cut holes for fittings as required.
SIDES & TOP
Secure Left, Right and Top with sheet metal screws as shown.
REAR
Attach Rear and secure with screws.
