Dettson HMR Installation Instructions And Homeowner's Manual page 5

1.7) CHIMNEY
1.7.1) Chimney draft
The chimney draft must be strong enough to ensure the safe and
reliable operation of your unit.
1.7.2) Installation
The connecting flue pipe diameter must never exceed that of the
chimney and its horizontal runs should have a minimum upward slope
toward the chimney of 2 cm per 1 m (1/4" per foot) of run. The use of a
damper in the connecting flue pipe is strictly prohibited. If more than
one pipe is to be connected to the same chimney, the sectional area
of the chimney must be equal to the total of the individual sectional
areas. The use of a draft control is compulsory. Its omission
constitutes sufficient grounds for voiding the warranty on the unit.
NOTICE
It is possible that an efficient hot water boiler will cause
the formation of condensation on the three outer sides
of an outside chimney. Should this happen, a chimney
liner or an "SMH" side wall venting system should be
installed.
1.7.3) Side wall venting
"HMR-HMT-HM2" hot water boilers are approved for installation with
the SMH side wall venting system. HMT hot water boiler is also
approved for installation with the VTK sealed combustion system.
If such a system is used, please refer to the installation manual
supplied with the venting system.
1.8) BLOCKED VENT SHUT-OFF (BVSO
For chimney venting
WARNING
IT IS IMPERATIVE THAT THIS DEVICE BE INSTALLED BY A
QUALIFIED SERVICE TECHNICIAN.
This device is designed to detect the insufficient evacuation of
combustion gases in the event of a vent blockage. In such a case
the thermal switch will shut down the oil burner. The device will then
need to be restarted MANUALLY.
Refer to the wiring diagrams and the detailed instructions supplied
with the BVSO for the installation and wiring procedures. The length
of wires supplied with the unit is such that the safety device must be
installed between the flue outlet of the appliance and the draft
regulator, as indicated in the instructions.
It is further imperative that the BVSO be maintained annually. For
more details refer to the instructions supplied with the device itself,
as well as Section 3 of this Manual.
CAUTION
A positive pressure
Combustion System or Direct Vent) MUST NOT use
the BVSO. Follow the instructions supplied with the
venting system.
1.9) BURNER INFORMATION
The burner is shipped in a box, separate from the boiler and must be
installed as follows:
1. Check that the model number on the burner carton matches
the one on the boiler nameplate;
2. Remove the burner from its box;
3. Check the electrode settings;
)
venting system (Sealed
4. Install the burner on the boiler, using the nuts which are
already on the studs. Be sure to install the fireproof gasket
supplied with the burner. Also, ensure that the end of the blast
tube is flush with the inside surface of the combustion chamber
when installing a Riello burner with an adjustable flange;
5. Connect the oil pipe(s) to the burner pump;
6. Wire the electrical connections in accordance with the
appropriate diagram (see Section 1.5.)
CAUTION
NEVER use the "interrupted ignition" function if a
Honeywell R7184 series combustion relay is
installed on the burner.
1.10) COMBUSTION AIR SUPPLY
In order to function reliably, every oil heating system requires an
adequate supply of combustion air. If the boiler must be installed in
a confined area, 2 permanent openings must be provided. Both
openings must be sized at 240 cm
burned per hour. One opening must be located near the ceiling, the
other near the floor.
1.11) PIPING
The satisfactory operation of your boiler depends greatly on the
installation of your plumbing. Refer to Figure 4.
In any event, the installation must include:
1. A pressure reducing valve, set at 83 kPa (12 psi), installed on
the boiler cold water supply;
2. An expansion tank pressurized to 83 kPa (12 psi), installed on
the piping;
3. An automatic air vent, to eliminate trapped air in the boiler;
4. A correctly sized water circulator, installed on the heating loop;
5. Stop valves and threaded unions, installed on the return and
supply pipes of the boiler.
Always use quality pipe sealant on all threaded connections and
ensure that these connections are well tightened. Avoid flushing the
system when the boiler is a replacement for an existing one, to limit
oxygen from getting into the system.
CAUTION
To avoid water damage and/or scalding due to
relief valve operation, a discharge line must be
connected to the valve outlet and run to a drainage
area. The discharge line shall be installed in such a
way that it will allow for the complete drainage of
the valve and discharge line.
1.12) BVSO PERFORMANCE TEST
The purpose of the following test is to check that the electrical outlet
on the furnace, designated to the BVSO, is functional.
1. Start up the burner;
2. Remove the three-pole plug from the BVSO outlet on the
furnace;
3. The burner must shut-off immediately.
If the test is not in line with the above, call a QUALIFIED SERVICE
TECHNICIAN.
2 2
/l (1 ft ) per U.S. gallon of oil
5