COSMOGAS BMS User manual

U.S.A.
62403262 - R1
INSTRUCTION MANUAL
For installation, use and maintenance for the
5-41-5
M DELS: BMS & BTS
Direct Vent
Space / Water Heater
Combined Appliance
For Heating and Domestic Hot Water
These instructions MUST be read prior to installation and
left near the appliance when the installation is completed.
Te t complies with minimum size requirements.
120601

2
SAFETY INSTRUCTI NS
WARNING: If the information in this
manual is not followed exactly, a fire or
explosion may result causing property
damage, personal injury or death.
 Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
 WHAT T D IF Y U SMELL GAS
 Do not try to light any appliance.
 Do not touch any electrical switch;
do not use any phone in your building.
 Immediately call your gas supplier
from a neighbors phone. Follow the
gas suppliers instructions.
 If you cannot reach your gas
supplier, call the fire department.
 Installation and service must be
performed by a qualified installer, service
agency or the gas supplier.
F R Y UR SAFETY
Do not store or use gasoline or other flammable,
combustible, or corrosive vapors and liquids
in the vicinity of this or any other appliance.

3
These instructions must be read prior to installation. If the information in these instructions
is not followed e actly, a fire or e plosion may result, causing property damage, personal
injury, or death.
Hazards and Your Safety - Hot Water Can Scald!
Water temperature over 125°F can cause severe burns instantly, or death from scalds.
Children, disabled, and elderly are at highest risk of being scalded; see instruction manual
before setting temperature at water heater! Feel water before bathing or showering.
Temperature limiting valves are available, see manual.
If there is a smell of gas:
-Turn the gas cock off - Air the room - Do not try to light any appliances - Do not use any
phone in your building - Do not touch any electrical switch - E tinguish any flames - Call
immediately a licensed authorized technician or your local gas company - Follow the gas
suppliers instructions - If you cannot reach your gas supplier, call the fire department.
If there is a smell of combustion roducts:
-Turn the unit off - Air the room - Call a licensed authorized technician.
Installation, alterations
Licensed authorized personnel must carry out the installation, calibration or alteration of the
gas apparatus. Flue gas ducts must not be modified in any way. Any replaced part or
packaging parts should never be left within reach of children.
Ex losive roducts or easily inflammable roducts
Do not keep, use or store e plosive materials or easily inflammable materials such as Gasoline,
Adhesives, Solvents, Paint Thinner, Butane, Liquefied Propane, paper, etc., near the heater.
Maintenance
The user, according to the heaters operating instructions, has to keep the installation in
good condition and guarantee the reliable, safe operation of the heater. At least once a year
the user must call in a licensed authorized technician for routine maintenance, before using
it for central heating.
Servicing Manual
When the installation and commissioning of the system has been completed, the installer
should instruct the homeowner to save the installation manual near the heater so that service
technicians may refer to it in the future.
Caution: Label all wires prior to disconnection when servicing controls. Wiring errors can
cause improper and dangerous operation. VERIFY PR PER PERATI N AFTER SERVICING.
Do not use this appliance if any part has been under water. Immediately call a qualified
service technician to inspect the appliance and to replace any part of the control system
and any gas control, which has been under water.
SAFETY INSTRUCTI NS

4
GENERAL INF RMATI N .................................................................................................. 4
TABLE F C NTENTS ....................................................................................................... 4
TABLE F C NTENTS ....................................................................................................... 5
GENERAL LAY UT of the main components of model BMS ........................................... 6
GENERAL LAY UT of the main components of model BTS ............................................ 8
GENERAL LAY UT of the main components of model BTS ............................................ 9
A INSTALLATI N INSTRUCTI NS .................................................................................. 10
1 Operating and adjusting the output to the radiation system ........................................ 10
2 Location ..................................................................................................................... 10
3 Installation .................................................................................................................. 10
3.1 Installation Template ......................................................................................... 10
A INSTALLATI N INSTRUCTI NS .................................................................................. 11
Clearances for installation ...................................................................................... 11
3.2 Safety Relief Valve ........................................................................................... 12
3.3.1 Installation of two heaters .............................................................................. 12
3.3.2 Installation of three or more heaters ............................................................. 12
GENERAL INF RMATI N
This instruction manual refers to two types of heaters, the BMS and the BTS.
BMS - this appliance is a wall mounted, direct vent space/water heater
BTS - this appliance is a self standing floor model, direct vent space/water heater
Each type of heater can be of two different input power rating; a 10/20 or 15/29;
10/20 has an input power rating of 87,000 (31.6) Btu/hr (kW)
15/29 has an input power rating of 107,000 (26) Btu/hr (kW)
BMS 10/20
or
BMS 15/29
or
BTS 10/20
or
BTS 15/29
When referring to this instruction manual, be sure of which type of heater you are working
with. This can be verified by referring to the data plate marked Space water heater model
. This data plate is located on the bottom side of the BMS, or on the inside of the front door
(internal side) of the BTS.
Also verify the type of gas for which the heater is set. A label in the front of your heater states
NATURAL GAS, for heaters set to natural gas, or LP GAS for heaters set to LP gas.
TABLE F C NTENTS

5
TABLE F C NTENTS
3.3.3 Radiant heating installation ........................................................................... 12
................................................................................................................................12
3.3.4 Used of glycol ................................................................................................ 12
................................................................................................................................13
3.4 Domestic Hot and Cold water ........................................................................... 13
3.5 Water Hardness ............................................................................................... 13
3.6 Gas Supply ....................................................................................................... 13
3.6 Gas Supply (cont.) ............................................................................................ 14
3.7 Electrical Supply Connection ............................................................................ 14
3.8 Room Thermostat Connection ......................................................................... 14
4 VENTING SYSTEMS ................................................................................................. 16
4.1 Concentric Flue (Coa ial) ................................................................................. 16
ATTENTION !!! .............................................................................................................. 17
4.2 Split Flue ........................................................................................................... 18
4.3 Chimney Venting .............................................................................................. 18
4.5 Venting Locations - Outside Walls (Direct Venting) ......................................... 18
4.6 Kit for air intake/flue discharge ......................................................................... 18
5 REGULATING THE DOMESTIC HOT WATER ........................................................... 31
6 BURNER.................................................................................................................... 31
6.1 Changing the Gas Type .................................................................................... 31
6.2 Adjusting Gas Flow and Pressure to the Burner .............................................. 31
7 WIRING DIAGRAMS ................................................................................................. 38
9.4 Summer-Winter Mode ...................................................................................... 42
9.5 Adjusting Central Heating ................................................................................. 42
9.6 Manual Reset High-Limit Thermostat ............................................................... 42
9.7 Resetting the Ignition Module ........................................................................... 42
9.8 Heating Circulator Pump .................................................................................. 42
9.9 Shut-Down Procedure ...................................................................................... 42
9.10 Maintenance ......................................................................................................... 42
9.11 Draining water from the heater .............................................................................. 42
10 - BTS model - INSTRUCTIONS FOR USE ............................................................... 43
10.1 Start-Up Instructions ....................................................................................... 43
10.2 Checks Prior to Ignition .................................................................................. 43
10.3 Ignition Procedure .......................................................................................... 43
10.4 Summer-Winter Mode .................................................................................... 44
10.5 Adjusting Central Heating............................................................................... 44
10.6 Manual Reset High-Limit Thermostat ............................................................. 44
10.7 Resetting the Ignition Module ......................................................................... 44
10.8 Heating Circulator Pump ................................................................................ 44
10.9 Shut-Down Procedure .................................................................................... 44
10.10 Maintenance ....................................................................................................... 44
10.11 Draining water from the heater ............................................................................ 44
E IMP RTANT INF RMATI N F R THE CUST MER ................................................... 48
F SPARE PARTS ............................................................................................................... 49
G TECHNICAL FEATURES .............................................................................................. 50

6
GENERAL LAY UT of the main components of model BMS
Figure 1 - BMS Front view
Coaxial discharge Split discharge
A = Flue discharge
B = Air intake

7
GENERAL LAY UT of the main components of model BMS
Figure 2 - BMS Side and top views
1 Central heating supply
2 Central heating return
3 Gas inlet
4 Domestic hot water outlet
5 Cold water inlet
6 Flue gas discharge fan
7 Automatic air vent
8 Thermostat bulb pocket
9 Gas valve service switch
10 Instrument panel
11 Temperature-pressure gauge
12 Failure lamp indicator
13 Ignition and detection electrodes
14 Burner
15 Gas manifold
16 Exchanger shell clamps
17 Gas valve
18 High limit thermostat
19 Power and circulator pump switches
20 Domestic hot water priority thermostat
21 Central heating regulation knob
22 Heater temperature control
23 Electrical control board
24 Ignition module
25 Electrical plastic cover
26 Electrical junction box
27 Expansion tank
28 Pressure switch
29 Domestic water heat exchanger
30 Heat exchanger
31 Turbulator
32 Support bracket
33 Central heating regulation valve
34 Circulator pump
35 Transformer

8
GENERAL LAY UT of the main components of model BTS
Figure 3 - BTS Front view

9
GENERAL LAY UT of the main components of model BTS
1 Central heating supply
2 Central heating return
3 Gas inlet
4 Domestic hot water outlet
5 Cold water inlet
6 Flue gas discharge fan
7 Automatic air vent
8 Thermostat bulb pocket
9- -
10 Instrument panel
11 Temperature-pressure gauge
12 Failure lamp indicator
13 Ignition and detection electrodes
14 Burner
15 Gas manifold
16 - -
17 Gas valve
18 High limit thermostat
19 Power and circulator pump switches
20 Domestic hot water priority thermostat
21 Central heating regulation knob
22 Heater temperature control
23 Electrical control board
24 Ignition module
25 - -
26 Electrical junction box
27 Expansion tank
28 Pressure switch
29 - -
30 - -
31 - -
32 - -
33 Central heating regulation valve
34 Circulator pump
35 Transformer
36 Low water cut-off
A Flue discharge
B Air intake
Figure 4 - BTS side view

10
A INSTALLATI N INSTRUCTI NS
1 perating and adjusting the
output to the radiation system
The COSMOGAS heater can be installed in any
domestic or light commercial building where
the maximum BTU/H required is not greater
than 84,000 BTU/H.
The unit has a internal mi ing valve (heating side
only) that can be adjusted to regulate the supply
water temperature delivered to the heating system.
The heating system will not receive any water
unless the water temperature inside of the heater
is at a minimum of 140°F. The heater built-in
domestic hot water priority thermostat will cease
the power to the circulator until the temperature is
greater than 140°F.
2 Location
This space/water heater unit is not intended for
outdoor installation. Choose a location centralized
to the piping system along with consideration to
the vent pipe length. Additionally, you will need to
place the space/water heater so that the controls,
drain, inlet/outlet, and gas valve are easily
accessed. Also, care must be e ercised when
choosing the location of this appliance, where
leakage from the safety relief valves, leakage from
related piping, or connections, will not result in
damage to the surrounding areas, or to the lower
floor of the building.
No valve is to be placed between the safety relief
valves and the heater. The discharge from the
temperature and pressure relief valve must be
conducted to a suitable place for disposal. No
reducing coupling or other restriction shall be
installed in the discharge line. The discharge line
should allow complete drainage of both valve and
line.
3 Installation
The installation must conform to local codes and
ordinances or, in the absence of local codes, the
National Fuel Gas Code ANSI Z 223.1/NFPA 54 -
1984. When installed the appliance must be
electrically grounded in accordance with the
National Electrical Code, ANSI/NFPA No.70 -
1987.
For Canada, the installation should conform to CGA
B149.1 INSTALLATI N C DES and/or local
installation codes.
The gas supply piping system should be tested
before the heater is connected.
The heater, (complete with all its parts: e ternal
jacket, intake and discharge flue pipes, etc.), must
be installed leaving a distance of at least 10 cm,
(4), from sidewalls and ceiling.
Installation of the BTS combi directly on
combustible flooring such as carpeting shall be
installed on a metal or wood panel e tending behind
the full width and depth of the appliance by at least
3, (76.2 mm), in any direction or, if the appliance
is installed in an alcove or closet, the entire floor
shall be covered by the panel.
3.1 Installation Template
ONLY model BMS is provided with an installation
Figure 5 - Installation template, nly
for model BMS
Figure 5

11
template to facilitate proper
installation alignments (See figure
5 below).
Clearances for
installation
The figures 5A and 5B show the
proper distances to keep from any
obstacle pertaining to the support
bracket (2) or to the wall.
The procedure for installing the
BMS is as follow:
1) - Take the support bracket (2)
and choose a position with proper
clearances, as per Figures 5A &
5B. A minimum clearance of 40
(100mm) is required from the front
of the heater.
WARNING: Please take caution
when choosing a mounting
surface for the heater. The weight
of the heater with water is
appro imately 165 lbs. Make
certain that the wall can support
such weight.
2) Screw the bracket to the wall.
The screws MUST screwed in
correspondence of the 16" vertical
studs.
3) Place the template onto the
support bracket and make all
rough-in holes for the piping to the
heater. The hole for the coa ial
flue vent kit discharge may also
be cut at this time.
4) Install the heater on the support
bracket and secure all of the
connections.
Figure 5A - Clearances for model BMS
Figure 5B - Clearances for model BTS
A INSTALLATI N INSTRUCTI NS

12
A INSTALLATI N INSTRUCTI NS
3.2 Safety Relief Valve
An ASME approved safety relief valve, (set
at 30 psi), must be installed in a vertical
position on the outlet side of the central
heating system, and as close as possible to
the heater. There must be no valves between
the safety relief valve and the heater.
Manually operate the safety relief valve at
least once a year to ensure proper operation.
Precaution must be taken prior to operating
the safety relief valve, to avoid contact with
hot water coming out of the safety relief valve
and to prevent water damege.
If the safety relief valve discharges
periodically, this may be due to thermal
e pansion in a closed water supply system.
Contact the water supplier or local plumbing
inspector on how to correct this situation. Do
not plug the safety relief valve.
3.3 Heating Supply and Return
The central heating supply and return pipes
are marked with different colored caps,
(supply red and return blue).
If there are any heating elements above
heater level, it is advisable to install a check
valve on the supply pipe to prevent natural
circulation phenomena from occurring.
If the heater is to be connected to an e isting
system it is advisable to wash out and remove
any deposits from inside the e isting pipes,
and install a filter at the lowest point to trap
any additional impurities when it is running.
This equipment is designed for use in a closed
loop system.
Installation schematics are found in figures
23 to 28.
WARNING !!! All the schematics in figures
23 to 28 are only samplesl. Safety apparatus,
pipe diameters, and au iliary accessories,
must be verified by a qualified personnel only
and in accordance with the national and/or
local codes.
3.3.1 Installation of two heaters
Iinstalling two heaters in parallel. Follow the
schema in the figure 23
3.3.2 Installation of three or more
heaters
Installing three or more heaters in parallel.
Follow the schema in the figure 24
3.3.3 Radiant heating installation
When the heater is used in conjuction with
radiant heating, it is imperative that the tubing
contains an o ygen diffusion barrier. If you
are unsure whether or not the tubing has a
barrier, a heat e changer must be used to
protect the heater from o ygen corrosion (See
figure 25). This situation will also occur if the
heater is used on an open-loop system where
new, cold-fill water is introduced into the
system. The o ygen will remove itself from
solution and react chemically with the ferrous
components (i.e. steel), causing them to rust
and corrode. THIS TYPE F FAILURE IS
N T C VERED BY THE WARRANTY!
3.3.4 Used of glycol
If glycol is used with the heater, the glycol
must be recognized as safe or approved by
the United States Food and Drug
Administration for food contact as listed in
Code of Federal Regulations, title 21, part 182
of the Food Additive Regulations. Any
additives introduced into the heating system
must be recognized as safe by the United
States Food and Drug Administration. If a
non-approved additive is used, it can
cause serious health problems or possibly
death.The pressure of the heating system
side of the heater must be fitted with devices
(automatic water feed/pressure reducing
valve not to e ceed 30 psi) arranged to
function automatically in order to maintain the
pressure of the heating side at a level below
that of the potable water leaving the heat
e changer.
3.4 Domestic Hot and Cold water
The domestic hot water flow restrictor must be
installed on the cold water inlet, (Refer to figure
25, 26, 27 and 28).
For servicing purposes, install a shut-off valve
upstream from the cold water inlet.

13
The heaters thermostat can be regulated to
provide domestic hot water between 100°F
and 180°F. Water temperature over 125°F
can cause severe burns instantly. Since it is
required that the heater water temperature
reach above 140°F in order for the heating
system side of the unit to operate, it is
imperative that a mixing valve be installed
external of the heater to further regulate
the temperature of the domestic hot water
(See figures 23, 25, 26, 27 and 28). Failure
to install a domestic side mixing valve will
result in severe burns!
Piping and components connected to the
water heater for space heating shall be
suitable for use with potable water, and shall
not be connected to any heating system or
components previously used with a non-
potable water heating appliance.
The domestic hot water circuit needs an
ASME approved temperature and pressure
P-T relief valve, set at 150 psi and 210°F,
installed as close as possible to the heater.
There must be no valves between the P-T
relief valve and the heater. The P-T relief
valve discharge pipe must not be
restricted or plugged.
3.5 Water Hardness
In hard water areas (above 150 p.p.m), it is
recommended that a suitable water treatment
device (softener with filters) be installed.
E cessive buildup of minerals in the heat
e changer can cause a non-warranty failure.
Water hardness can be determined by using
the standard test or by checking with your
local water authority.
To ic chemicals, such as used for heater
treatment, should not be introduced into the
potable water used for space heating.
3.6 Gas Supply
Before making any gas connections, verify
that the heater is being supplied with same
gas type as indicated on the rating plate. The
rating plate is located on the front of the BMS,
and is located on the front door of the BTS.
This heater has orifices which will operate at
an altitude of up to 2,000 feet. For
installations in higher elevations, down-rate
the heater by 10%.
Install a manual gas cock outside of the
heater. Refer to Figures 1 and 3, item 3, for
the gas inlet location of the heater.
Gas piping to the heater must be sufficient
to guarantee a supply of gas to meet
ma imum requirements. See Table 1 for
ma . and min. values of gas pressure (Back
of manual).
All piping must comply with local codes
and ordinances or with the National Fuel
Gas Code, (ANSI Z223.1 NFPA No. 54),
whichever applies.
The appliance and its individual shutoff
valve must be disconnected from the gas
supply piping system during any pressure
testing of that system at test pressures
in excess of ½ psig, (3.5 kPa).
The appliance must be isolated from the
gas supply piping system by closing its
individual manual shutoff valve during any
pressure testing of the gas supply piping
system at test pressures equal to or less
than ½ psig, (3.5 kPa).

14
A INSTALLATI N INSTRUCTI NS
Length of Gas Pipe Capacity of Gas Pipe Size in MBTUH
1/2" 3/4" 1" 1 1/4"
10' 132 278 520 1050
20' 92 190 350 730
30' 73 152 285 590
40' 63 130 245 500
50' 115 215 440
75' 93 175 360
100' 79 150 305
150' 64 120 250
Additional length
to be added for 1.3' 1.7' 2.2' 2.7'
each bend or tee
3.6 Gas Supply (cont.)
3.8 Electrical Supply Connection
The heater must be connected to a 115V
60Hz, single phase electrical supply fused
to 15 amps,
Grounding is required as well as the
installation of a main emergency switch
immediately upstream from the heater.
An electrical junction box (see figures 1 and
3, item 26) is provided for connections for
both the line voltage of 115V 60 Hz (See
figure 6 item A) , and the room thermostat
at low voltage of 24Vac (See figure 6 item
B).
The cable wire of the line voltage must be
insered into the heater, through the pass-
cable positioned in the side of the idraulic
connections (see figure 7 and 8).
A Electrical supply
connection
B Room thermostat
connection
Figure 6 - Connecting the room
thermostat and electrical supply
3.7 Room Thermostat Connection
This is installed by removing the electrical
junction bo cover indicated in fig.6, (see fig.1
and 3, item 26), and connecting the two wires
of the room thermostat, or zone valve control
thermostat, to the low voltage terminals,
(figure 6, item B). N TE: first remove
factory installed jumper from terminals.
The room thermostat must always be located
in a point of the house where the temperature
is not subject to sudden changes.

15
A INSTALLATI N INSTRUCTI NS
Figure 6A - Installation of the electrical
supply cable on the model BMS
a) Remove or loosen screw (2)
b) Pop- out the passage tunnel for the
supply cable. Pass the supply cable
through the passage (1)
c) Connect the supply cable to the
junction box
d) Tighten screw (2);
e) Re-insert the passage tunnel into its
position (4).
f) Feed wire to junction box and
connect as shown in Figure 6.
Figure 6B - Installation of the
electrical supply cable on the model
BTS
a) Remove or loosen screw (2)
b) Pop- out the passage tunnel for the
supply cable. Pass the supply cable
through the passage (1)
c) Connect the supply cable to the
junction box
d) Tighten screw (2);
e) Re-insert the passage tunnel into its
position (4).
f) Feed wire to junction box and
connect as shown in Figure 6.

16
A INSTALLATI N INSTRUCTI NS
4 VENTING SYSTEMS
This heater can be fitted with either a
concentric or split type venting system.
Particular attention must be taken when
installing the vent pipes that go through the
wall to the outside. It must always be possible
to carry out routine maintenance operations
of the flue. The vent pipe must be installed
in such a way that it can be removed, if
needed, in the future. Hence, a suitable
sheath should be prepared in which to insert
the vent pipe. Both venting systems are
suitable for venting through a wall 1 to 24
thick.
The connection of the vent air intake system
to the heater can turn 360°, which means in all
directions, making installation e tremely easy.
To turn it just loosen the securing screws on
the base of the vent elbow where it attaches
to the heater, turn to desired position, then
tighten the screws without forcing them.
You must place the terminal in an open area,
and follow the following guidelines:
 Make certain that e haust gas does not
re-circulate back into the intake pipe.
 Never vent into a walkway or patio area,
or an alley, or otherwise public area less than
7ft from the ground level. This is to prevent
anyone from walking into the vent;
 Never vent over or under a window or over
a doorway;
 Never install a heat saver or similar product
to capture waste heat from e haust;
 Always have vent 1ft above ground level,
away from shrubs and bushes.
 Follow local gas codes in your region or
refer to National Fuel Gas Code, or Can
B149.1 INSTALLATI N C DES.
 Always have vent at least 3ft from an inside
corner of outside walls.
 Maintain at least 4ft clearance to electric,
gas meters and e haust fans.
 Always place screens in all openings in
intake and e haust to prevent foreign matter
from entering the heater.
 The vent terminals, (concentric, split type
e haust), must be a minimum of 1ft above
the ground level.
 If split type vent will be venting into a
chimney, make certain that no other
appliances are vented into it. This power-
vented heater must not share a chimney.
Vent e haust terminal should be inserted into,
but not beyond, inner wall of chimney.
Do not vent into transient pipe. Warranty will
be void.
CAUTI N! - Take all precautionary measures
to allow the angle of the flue to run down slightly
to the outside, NEVER rising. Anticipate for
all horizontal pipes, an inclination of 1/4 per
foot toward the discharge. If a vertical pipe
follows a horizontal one, place a condensation
discharge fitting in the lowest part of the vertical
pipe. A condensation discharge pipefitting
must also be used for vertical discharge pipe
installations directly from the heater with a pipe
whose length is more than 10.
During normal operating conditions, the
heater will have e haust gases e iting from
the flue pipe. The smoke will be heavier on
some days than on others. This is due to
the outdoor weather conditions (the
temperature, humidity, etc.), and is
e tremely common.
4.1 Concentric Flue (Coaxial)
The (Coa ial) concentric vent, (air inlet and
flue outlet), system consists of 2 pipes: the
outer one for fresh air intake, the inner pipe
for flue e haust discharge.
With optional pipe, it is possible to increase
the overall length up to 15ft (4.5 m).
There are also 90° concentric elbows
available, if they are installed, there will be a
loss of draught equal to that caused by 3ft,
(1 m), of straight pipe.
Connections between the various parts must
be secured by using self-tapping screws, (see
fig.9). The vents stainless steel end terminal
must always come completely out of the outer
pipe. If for any reason the intake grid is

17
blocked, the heater will not receive enough
air for combustion and the burner would fail
to ignite.
ATTENTI N !!!
We want to remember that all accessories
in the line of the air intake and in the line of
flue discharge MUST be secured with
screws beetween them, and MUST be
sealed from flue or air leakage
PRECAUTI N T BE TAKEN
WHEN INSTALLING C AXIAL
VENTING
Proper assembly and installation of venting
elbows and tubing must include the use of
self-tapping screws to permanently secure
in place the
internal discharge tube. Self-tapping
screws are used to insure that the
discharge vent tube remains in place and
not allow discharge gases to re-enter the
heater. Failure to secure the internal
discharge tube may result in the heater
backfiring and causing permanent damage
to the heat e changer. Heaters which have
been damaged for this reason are not
covered in our limited warranty.
The stainless steel (End terminal) wind
guard must fit properly and inter-lock into
slip joint of intake pipe.
It is imperative that the internal discharge
pipe first be secured in place with self-
tapping scews before attaching and
securing the e ternal vent pipe. Also,
ensure that the two grids of the end
terminal come completely out of the outer
pipe. If the intake grid is hidden the heater
will not receive enough air for combustion
and would fail to ignite.
Picture # X: First, insert the vent inner pipe
into the vent elbow and tighten using self-
tapping screws
Picture # Y: Second,
fit the outer pipe and
secure it with proper
screws
See drawings below.
K = Screws provided
L = Inner pipe
M = Screws provided
A INSTALLATI N INSTRUCTI NS

18
A INSTALLATI N INSTRUCTI NS
N = This position shall be respected
O = Discharge grid
P = Intake grid
4.2 Split Flue
The split flue vent system (two separate
pipes) can be e tended (on the discharge
side only) up to a total length of 20 ft (6 m).
Changes in direction can be obtained by
using 90° and 45° elbows. If they are
installed, there will be a loss of draught equal
to 3ft (1 m) and 1 1/2ft (0.5 m) of straight
pipe, respectively. This is valid only for pipes
and elbows manufactured by Cosmogas
s.r.l..
If the heater is installed in a large open area
such as a full basement or alcove, the
combustion air could also be supplied without
the intake pipe, (For model BMS see figures
8, 11, 12, 13 and 14 or for model BTS see
figures 16, 18, 19 and 20 for model BTS).
N TE: The heater will draw all air for
combustion through the top of the unit from
the space around the heater. Ventilation
should be adequate to provide sufficient air
to properly support combustion. Air for
combustion and room ventilation must be
obtained from spaces freely communicating
with the outdoors. Air openings to the room
should not be obstructed.
For heaters in confined rooms, two
permanent openings must be provided - one
within 12 of the ceiling and one within 12 of
the floor. Each opening must be at least one
square inch per 1,000 BTU/H heater input,
but not less than 100 square inches. These
openings must freely connect with areas
having adequate infiltration to the outside.
When all air provided is supplied from the
outdoors, the openings, as described above,
shall be of the size listed below for each
particular arrangement:
- All ducting shall be the same size as the
opening which it is to be connected.
- One square inch of free area per 4,000 BTU/
H of heater input for direct outdoor air supply
through an outside wall or vertical duct directly
outside.
- One square inch of free area for every 2,000
BTU/H of heater input for direct outdoor air
through horizontal ducting.
Caution!
The discharge pipe temperature is above
250°F while functioning, therefore it is
essential that a thermal insulation
protection sheath be used in the wall
opening.
4.3 Chimney Venting
If split type vent will be venting into a chimney,
make certain that no other appliances are
vented into it. This power-vented heater must
not share a chimney. Vent e haust terminal
should be inserted into, but not beyond, inner
wall of chimney.
Do not vent into transient pipe. Warranty
will be void.
4.5 Venting Locations - utside
Walls (Direct Venting)
The center line of the vent opening must be
at least 16 1/2 above grade, outside, and at
least 12 from any other building openings
(doors, windows, etc.).
Make sure that vent pipe is pitcheed down
from the unit toward the outside wall 1/4 per
foot. This will prevent any water from running
back into the heater.
Do not locate the vent terminal where flue
products could strike against building
materials and cause corrosion.
4.6 Kit for air intake/flue
discharge
For comfort for the installer, COSMOGAS
has created some flue kit, complete of all
the necessary components for flue
discharge and air intake. The four kits
available are as follows:

19
P/N 62617168. Split vent kit. This kit is for
take the air from the room where the heater
is installed, and discharge the flue outside
from the building. The pipe of discharge is
length 2.5ft.. If you need e tensiones or
elbows or other accessories, refer to figures
R, S and T. This kit can be used for heaters
model BMS and BTS.
P/N 62617174. Coaxial Vent & Elbow Kit.
This kit is for taking and discharging air from/
to the outside of the building. The pipe of
discharge length is 3ft. If you need e tensions,
elbows or other accessories, refer to figures
O, P and Q. This kit can be used for heaters
model BM and BTS. To discharge the flue in
vertical position you must to use a roof vent
terminal 62617070, (see figure P)
P/N 62617175. Coaxial Vent & Straight
Adapter Kit. This kit is for taking and
discharging air from/to the outside of the
building. The pipe of discharge length is 3ft.
If you need e tensions, elbows or other
accessories, refer to figures O, P and Q. This
kit can be used for heaters model BM and
BTS. To discharge the flue in vertical position
you must to use a roof vent terminal
62617070, (see figure P)
P/N 62630046. Vent Adaptor for 3"
Discharge pipe. This kit is for to connect only
the flue discharge to a commercial 3 pipe.
This kit must be used toghether with a heater
mounted adapter P/N 62617124 or
62617060. With this configuration, the
installer is responsible for the materials used
and for the installation. In any case follow
the national or local codes..
A INSTALLATI N INSTRUCTI NS

20
Besides the kits COSMOGAS has a series of accessories, that in conjonction with the kits,
give the installer the possibility of many configuration of flue discharge and/or air intake.
See e emples to the figures O, P, Q, R, S, T, U and V. Please remember that these
configurations are only e amples, and that many other possibilities e ist.
Reference P/N Description
1 60702011 Washer for split
2 60702012 Washer for coa ial
3 61302011 Split system Roof terminal D. 80
4 62617010 Plug for flue test
5 62617049 3ft coa ial E tension
6 62617053 Split system Roof terminal D. 80
7 62617056 Split system In-Line Elbow FF 90°
8 62617058 Split system In-Line Elbow MF 90°
9 62617060 Coa ial elbow (Heater Mounted Only)
10 62617062 Split system Viking
11 62617063 Silicone Coupling + clamp
12 62617070 Coa ial Roof Terminal
13 62617077 In-Line Elbow 90° M/F (Coa ial)
14 62617086 3ft E tension for split system
15 62617087 Coa ial 3 ft vent, (End-Terminal only)
16 62617124 Straight coa ial Adapter (Heater mounted only)
17 62617159 In-Line Elbow 45° M/F (Coa ial)
18 62617168 Split vent kit
19 62617172 Coa ial 60/100 condensing trap
20 62617173 Split-vent D.80 condensing trap
21 62617174 Coa ial Vent & Elbow Kit
22 62617175 Coa ial Vent & Straight Adapter Kit
23 62630046 Vent Adaptor for 3" Discharge pipe
24 61302003 Intake grid D.80
25 61302004 Terminal vent D.80
26 62617059 In-Line elbow 45° M/F (for split)
A not available Flat for roof
B not available Condensate discharge
C not available Terminal vent for roof (3 diameter)
D not available E tension (3 diameter)
E not available Tee raccord (3 diameter)
F not available Condensate discharge with siphon (3 diameter)
G not available In-Line Elbow 90° (3 diameter)
In the following pictures, the P/N 62617062 is repeated 4 times to show all of the
possibilities that has this accessory has. It can be rotated 360° under the heater, and its
elbows can also be rotated 360° to direct air intake and flue discharge in all orientations.
A INSTALLATI N INSTRUCTI NS