COSMOGAS BMS 10/20 User manual

INSTRUCTIONMANUAL
For installation, use and
maintenance for the
MODELS:
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.
Text complies with minimum size requirements.
U.S.A.
62403262R04-06/02

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SAFETY INSTRUCTIONS
WARNING:Iftheinformationinthismanual
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.
— WHATTODOIFYOU SMELLGAS
• 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.
FORYOUR 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.

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These instructions must be read prior to installation. If the information in these instructions
is not followed exactly, a fire or explosion 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 - Extinguish 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 products:
-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.
Explosive products or easily inflammable products
Do not keep, use or store explosive 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 PROPER OPERATION 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 INSTRUCTIONS

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GENERALINFORMATION
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
Eachtypeofheatercanbeoftwodifferentinputpowerrating;a10/20or15/29;
10/20 hasan input power rating of 87,000 Btu/hr (26 kW)
15/29 hasaninputpowerratingof107,000Btu/hr(31.6 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
workingwith. This canbe verified byreferring to the dataplate 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.
Alsoverify thetype ofgas forwhichthe heateris set.Alabel inthe frontofyourheater
states “NATURALGAS”, forheaters setto naturalgas, or “LPGAS” forheaters set to
LP gas.

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GENERALINFORMATION ...................................................................................................... 4
TABLEOFCONTENTS .......................................................................................................... 5
GENERALLAYOUT ofthemaincomponentsofmodelBMS ............................................... 7
GENERALLAYOUT ofthemaincomponentsofmodelBTS ................................................ 9
A INSTALLATIONINSTRUCTIONS ..................................................................................... 11
1 Operating and adjusting the output to the radiation system ...................................... 11
2 Location..................................................................................................................... 11
3 Installation ................................................................................................................. 11
3.1 Installation template ........................................................................................ 12
3.1.1 Clearances for installation............................................................................ 12
3.2 Safety Relief Valve ........................................................................................... 13
3.3 Heating supply and Return .............................................................................. 13
3.3.1 Installation of two heaters............................................................................. 13
3.3.2 Installation of three or more heaters ............................................................ 13
3.3.3 Radiant heating installation.......................................................................... 13
3.3.4 Used of glycol................................................................................................ 13
3.4 Domestic Hot and Cold water ......................................................................... 14
3.5 Water Hardness............................................................................................... 14
3.6 Gas Supply ....................................................................................................... 14
3.6 Gas Supply (cont.)............................................................................................ 15
3.7 Room Thermostat Connection ........................................................................ 15
3.8 Electrical Supply Connection ........................................................................... 15
4VENTINGSYSTEMS .................................................................................................. 17
4.1 Concentric Flue (Coaxial) ................................................................................ 17
4.2 Split Flue .......................................................................................................... 19
4.3 Chimney Venting .............................................................................................. 19
4.4 Venting Locations - Outside Walls (Direct Venting)......................................... 19
4.5 Kit for air intake/flue discharge ........................................................................ 19
4.7 Water Connections for Model BMS .................................................................. 32
4.8 Water Connections for Model BTS................................................................... 33
5REGULATINGTHEDOMESTICHOTWATER ............................................................ 40
6 BURNER ................................................................................................................... 40
6.1 Changing the Gas Type ................................................................................... 40
6.2 Adjusting Gas Flow and Pressure to the Burner............................................. 40
7WIRINGDIAGRAMS................................................................................................... 41
B OPERATINGANDMAINTENANCEINSTRUCTIONSforBMS ........................................... 44
9 BMS model; INSTRUCTION FOR USE ...................................................................... 44
9.1 Start-Up Instructions ........................................................................................ 44
9.2 Checks Prior to Ignition.................................................................................... 44
9.3 Ignition Procedure............................................................................................ 44
9.4 Summer-Winter Mode...................................................................................... 45
9.5 Adjusting Central Heating................................................................................ 45
9.6 Manual Reset High-Limit Thermostat ............................................................. 45
9.7 Resetting the Ignition Module .......................................................................... 45
9.8 Heating Circulator Pump ................................................................................. 45
9.9 Low water cut-off device................................................................................... 45
TABLEOFCONTENTS

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9.10 Shut-Down Procedure ................................................................................... 45
9.11 Maintenance ................................................................................................... 45
9.12 Draining water from the heater ...................................................................... 45
C OPERATINGANDMAINTENANCEINSTRUCTIONSforBTS ............................................ 46
10 - BTS model - INSTRUCTIONS FOR USE ............................................................... 46
10.1 Start-Up Instructions ...................................................................................... 46
10.2 Checks Prior to Ignition.................................................................................. 46
10.3 Ignition Procedure.......................................................................................... 46
10.4 Summer-Winter Mode.................................................................................... 47
10.5 Adjusting Central Heating.............................................................................. 47
10.6 Manual Reset High-Limit Thermostat ........................................................... 47
10.7 Resetting the Ignition Module ........................................................................ 47
10.8 Heating Circulator Pump ............................................................................... 47
10.9 Low water cut-off device................................................................................. 47
10.10 Shut-Down Procedure ................................................................................. 47
10.11 Maintenance ................................................................................................. 47
10.12 Draining water from the heater.................................................................... 47
D TROUBLESHOOTING ...................................................................................................... 48
11 Troubleshooting Sequence of Operation to Light the Burner................................... 48
12 Troubleshooting Sequence of Operation for a Call for Heat .................................... 49
E IMPORTANTINFORMATIONFORTHECUSTOMER ......................................................... 51
F SPAREPARTS ................................................................................................................ 52
G TECHNICALFEATURES .................................................................................................. 53
NOTES................................................................................................................................ 55
TABLEOFCONTENTS

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GENERALLAYOUTofthemaincomponentsofmodelBMS
Figure 1 - BMS Front view
Coaxial discharge Split discharge
A = Flue discharge
B = Air intake

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GENERALLAYOUTofthemaincomponentsofmodelBMS
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
36 Low water cut-off

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GENERALLAYOUTofthemaincomponentsofmodelBTS
Figure 3 - BTS Front view

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GENERALLAYOUTofthemaincomponentsofmodelBTS
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