Part 4 - General venting
The
boiler is a direct vent, category IV, appliance with sealed combustion requiring certain venting
systems. All combustion air is drawn directly from outdoors, with some specific exceptions. The housing closes the
appliance on the rear plate air-tightly. All products of combustion are vented directly outdoors. Both the Vent and
Air-Intake piping should be piped to the outdoors, using the vent material and rules outlined in this section. Under
no conditions may this appliance vent gases into a masonry chimney. Safety provisions with regard to (too) high
flue gas temperatures to protect synthetic intake / discharge piping have been provided within the
boiler.
The safety system shuts down the gas supply in case the temperature of the flue gasses becomes too high, after
which the appliance will not run until re-started. Installations must comply with CSA B149.1 and local requirements.
Warning
The
boiler cannot share a common vent or air-intake with multiple appliances. Failure to comply will result
in serious injury or death.
The
appliance does not use air (Oxygen) from the installation room, except with specific exceptions as
noted later in this manual. The front cover closes the housing air-tight making sure air is only supplied by the vent air
intake. Therefore make sure the front cover always has been placed in its position during operation of the appliance.
Shown graph describes the relationship between system power (BTU/hr) and resistance (Psi) of the supply
and discharge. Till a pressure of 200 Pa (0.030 Psi), power will remain the same. Bigger resistance causes
power decrease.
90000
80000
70000
60000
50000
40000
30000
20000
10000
P
o
w
e
r
0
1
0,015
0,0302
0,0453
0,058
4
0,073
5
Figure 4.1 Pressure resistance vs power
Pressure
Have horizontal runs sloping backwards to the boiler not less than 5 cm / mtr (0.6 inch / feet) from the terminal to
the boiler l to prevent condensate moisture from running into the air intake piping.
Combustion Air-Intake Contamination
Be careful not to locate the Air-Intake termination in an area where contaminants can be drawn in and used for
combustion. Combustion air containing dust, debris or air-borne contaminants will drastically increase the required
maintenance and may cause a corrosive reaction in the Heat Exchanger which could result in premature failure,
fire, serious injury, or death. See Table 4-1 for a list of areas to avoid when terminating air-intake piping. These
same conditions should be avoided when drawing intake air from boiler room.
Table 4-1 - Corrosive Products and Contaminant Sources
Products to Avoid
Contaminated Sources to Avoid
Antistatic fabric softeners, bleaches, detergents,
Laundry facilities
cleaners
Perchloroethylene (PCE), hydrocarbon based
Dry cleaning facilities
cleaners
Chemical fertilizer, herbicides/pesticides, dust,
Farms or areas with livestock and manure
methane gas
Paint or varnish removers, cements or glues, sawdust
Wood working or furniture refinishing shops
Water chlorination chemicals (chloride, fluoride)
Swimming pools, hot tubs
Solvents, cutting oils, fibreglass, cleaning solvents
Auto body or metal working shops
Refrigerant charge with CFC or HCFC
Refrigerant repair shops
Permanent wave solutions
Beauty shops
Fixer, hydrochloric acid (muriatic acid), bromide,
Photo labs, chemical / plastics processing plants
iodine
Cement powder, crack fill dust, cellulose, fibre based
Concrete plant or construction site
insulation
17
R Series
R Series
R Series
R Series