Burnham RSA User Manual download pdf (Page 18)

IV. Venting

A. General Guidelines.

1. Vent system installation must be in accordance

with these instructions and applicable provisions of

local building codes. Contact local building or re

ofcials about restrictions and installation inspection

in your area.

2. The RSA Series is designed to be vented into a

reclay tile-lined masonry chimney or chimney

constructed from type-L vent or a factory

built chimney that complies with the type HT

requirements of UL103. The chimney or vent pipe

shall have a sufcient draft at all times, to assure

safe proper operation of the boiler. See Figure 11 for

recommended installation.

a. Install a draft regulator (supplied by installer)

following the instructions furnished with the

regulator. See Figure 12 for alternate regulator

locations.

b. With any new or replacement installation the

chimney has to be considered. Chimneys that

have a high heat loss become less suitable as

the heat loss of the home goes down and the

efciency of the boiler goes up. Most homes

have a chimney appropriate for the fuel and

the era in which the home was built. That may

have been a coal red or an inefcient oil red

boiler built into a home without insulation or

storm windows. With increasing fuel prices that

home probably has been insulated and tted with

storm windows so that the heat loss of the home

has been reduced. This requires less fuel to be

burned and sends less heat up the chimney.

A new boiler probably has a higher efciency

than the boiler being replaced. That probably

means that the stack temperature from the

new boiler will be lower than that from the

old boiler and with less room air being drawn

up the chimney to dilute the stack gases. The

combination of a large uninsulated chimney,

reduced ring rate, reduced ring time, lower

stack temperature and less dilution air can, in

some cases, contribute to the condensing of small

amounts of water vapor in the chimney. Such

condensation, when it occurs, can cause chimney

deterioration. In extreme cases, the chimney

may have to be lined to insulate the chimney and

thus prevent the condensation. The addition of

dilution air into the chimney may assist in drying

the chimney interior surfaces.

A massive chimney on a cold, or exposed outside

wall may have produced adequate draft when it

was red with a higher input and greater volumes

of heated gases. With reduced input and volume,

the draft may be severely affected. In one

instance our research showed a new chimney of

adequate sizing produced only -.035” W.C. after

30 minutes of continuous ring at 13.0% CO

Outside wall chimneys take longer to heat up and

can have .00” W.C. draft at burner start-up. You

may have to consider a special alloy chimney

ue liner with insulation around it and stabilizing

draft cap or even a draft inducing fan in severe

cases.

c. For the same reasons as in (2.) above, heat

extractors mounted into the breeching are not

recommended.

3. For minimum clearances to combustible materials

refer to Figure 2.

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Burnham RSA User Manual Page 18

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