LAARS HP-M2 Series - Installation, Operation and Maintenance Instructions - Manual (Page 6)

Page 6 LAARS Heating Systems
2B. Chimney Venting (USA Only)
Model H(W)-M2-60 and H(W)-M2-100 MUST
NOT BE CHIMNEY OR B-VENT CONNECTED.
Model H(W)-M2-130 is a category l boiler and
may be vented in chimneys subject to the following
requirements:
Chimney must be internally lined or “B” vent
type. EXTERNAL OR UNLINED CHIMNEYS MAY
ONLY SERVE AS A CHASE for utilization of
stainless steel alternative venting providing no other
equipment is vented into it, or the chimney may have
an approved liner installed into the flue.
Two (2) or more vent connectors, from either
power or natural draft units, may enter a common gas
vent providing they conform to the requirements and
tables of the National Fuel Gas Code, ANSI Z223.1/
NFPA 54- latest edition, or applicable provision of the
local building code. None may be connected to
equipment with a positive vent pressure.
Locate unit as close to chimney as possible for
shortest vent connector.
2C. Installation
Determine height of chimney or B-Vent and
length of lateral run. Select vent connector diameter
from:
1). Table 1 or 2 of the National Fuel Gas Code,
ANSI Z223.1 / NFPA 54- latest edition (see
excerpts), or
2). Table G-3 of the Can /CGA - B149 Installation
Code.
Install an adaptor at the flue outlet of the unit to
step up to the diameter of the vent connector. Install
elbow for vent connector, if required. This elbow
should be full size of the vent connector. DO NOT
install a three (3) inch elbow between the flue outlet
on the unit and the adaptor. DO NOT use plastic vent
pipe in any part of the chimney vent connection.
Install vent connector between elbow, if used,
and chimney. Pitch vent connector up toward chimney
¼" per foot of lateral run. Secure all joints with
sheetmetal screws.
2D. Alternate Venting Method
(Canada Only)
The H Series may be vented vertically up
through a masonry chimney using a 4" diameter ULC
Certification Flexible Stainless Steel Vent.
Observe the following requirements:
1). The flexible vent must be run from the boiler up
through the entire chimney.
2). The chimney must terminate with a suitable vent
cap.
3). If chimney is exposed, the vent pipe should be
insulated.
4). The vent pipe must be installed with a ¼" per
foot upward slope from the boiler to the
chimney.
5). The vent pipe must be supported every 3' to
prevent sagging.
6). All joints in the vent must be secured with at
least two corrosion resistant screws and sealed
with an approved silicone sealant and checked
for gas tightness.
7). The vent system should be checked once a year
by a qualified serviceman.
Note: Boiler may not be vented in common with
another gas appliance or be vented using B-vent.
SUPPLY
DOMESTIC
RETURN
Figure 3. HW-M2.
↑
3.5" deep
Figure 4. H-M2.
OUT OF
PRODUCTION