THERMO 2000 BTH 8 User manual

BTH Electric Boilers
Models ranging from 8 kW to 36 kW :
240 Volts ( 1 phase ) & 600 Volts ( 3 phases ).
USE & CARE MANUAL
WITH INSTALLATION INSTRUCTIONS FOR THE CONTRACTOR
Your BTH Electric Boiler has been carefully assembled and factory tested to provide years
of trouble-free service. The following information and safety measures are provided to
enable proper installation, operation, and maintenance of this product.
It is imperative that all persons who are expected to install, operate or adjust this boiler
should read these instructions carefully.
Any questions regarding the operation, maintenance, service or warranty of this electric
boiler should be directed to the supplier.
When all installation steps have been completed, insert this installation manual in its original
envelope, and keep in a safe place (close to the boiler) for future reference.
THERMO 2000 INCORPORATED revision:August/06
Printed in Canada

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 2.
Ratings & Specifications
Electric Ratings for 240 VAC (1 phase) Electric Boilers:
Electric Elements
(in Watts) Total Wires Breakers Fuse
125%
Model
No. A B C D Watts Amp. BTU CU AL Amp. Amp. Amp.
BTH 8 5 000 3 000 ------ ------ 8 000 33.3 27 296 8 6 50 50 41.3
BTH 10 5 000 5 000 ------ ------ 10 000 41.6 34 120 6 6 60 60 52
BTH 12 3 000 3 000 3 000 3 000 12 000 50 40 944 6 4 70 70 62.5
BTH 15 3 000 4 500 3000 4 500 15 000 62.5 51 180 4 3 100 80 78.2
BTH 18 4 500 4 500 4500 4 500 18 000 75 61 416 3 2 100 100 93.8
BTH 20 5 000 5 000 5000 5 000 20 000 83.4 68 240 3 1 125 110 104
BTH 24 6 000 6 000 6000 6 000 24 000 100 81 888 1 0 125 125 125
BTH 27 3 x 4 500 3 x 4 500 27 000 112.5 92 124 1 0 150 150 140
BTH 30 3 x 5 000 3 x 5 000 30 000 125 102 360 2/0 3/0 200 175 156
BTH 33 3 x 5 000 3 x 6 000 33 000 138 112 596 2/0 3/0 200 200 172
Electric Ratings for 600 VAC (3 phases) Electric Boilers:
Model
Electric Elements Electric Elements Total Wires Fuse
No. Quantity Watts Quantity Watts kW Amp. BTU RW-90 HRC “D”
BTH 9 3 3 000 ------- ------ 9 8.7 30 708 14 15 A
BTH 13 3 4 500 ------- ------ 13.5 13 46 062 12 20 A
BTH 18 6 3 000 ------- ------- 18 17 61 416 10 30 A
BTH 22 3 3 000 3 4 500 22.5 22 76 770 10 30 A
BTH 27 6 4 500 ------- ------- 27 26 92 124 8 40 A
BTH 30 6 5 000 ------- ------- 30 29 102 360 8 40 A
BTH 36 6 6 000 ------- ------- 36 35 122 832 8 50 A
Note: 1 kW =3,412Btu
Connections sizes & overall dimensions
Connections sizes Boiler overall dimensions
Boiler return 1 “ NPT M Height 12 inches
Boiler feed 1 “ NPT M Width 12 inches
Waterworks 1/2 “ NPT F Depth 34 inches
Safety valve 3/4 “ NPT F Shipping weight 99 lbs.
Drain valve 1/2 “ NPT F
Drain valve
(BTH 33,36) 3/4 “ NPT M
Operating temperature : from 50°F to 190°F. Maximum operating pressure: 30 p.s.i.

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 3.
Unit description:
Legend :
A. Boiler Water Supply Connection ( 1 inch diameter, NPT male)
B. Boiler Water Return Connection ( 1 inch diameter, NPT male)
C. Safety Relief Valve ( ¾ inch NPT female )
D. Temperature & Pressure Gage (1/2 inch NPT female )
E. Drain Valve (1/2 inch NPT female )
F. Fill Water Connection (1/2 inch NPT female )
G. Electric Line Knock-Out ( 1 inch )
H. Pilot Light
I. Boiler Wall Hanging Brackets
J. Electrical Compartment

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 4.
General Safety Precautions
Be sure to read and understand the entire Use & Care Manual before attempting to install or to
operate this water heater. Pay particular attention to the following General Safety Precautions.
Failure to follow these warnings could cause property damage, bodily injury or death. Should
you have any problems understanding the instructions in this manual, STOP, and get help from
a qualified installer or technician. Introduction
These important safeguards and instruction
appearing in this manual are not meant to
cover all possible conditions and situations
that may occur. It should be understood that
common sense, caution and care are factors
which cannot be built into every product.
These factors must be supplied by the
person(s) caring for and operating the unit.
LOCAL INSTALLATION REGULATIONS
This electric boiler must be installed in
accordance with these instructions and in
conformity with local codes, or in the absence of
local codes, with the National Plumbing Code
and the National Electric Code, current edition.
In any case where instructions in this manual
differ from local or national codes, the local or
national codes take precedence.
SECURITY CONSIDERATIONS
Domestic and commercial installations have a
maximum design operating pressure limited to
30 psi by a safety relief valve.
Boiler maximum operating temperature is 190°F
by design. This boiler is designed to be used
only in a hot water heating system.
The heat transfer medium must be water or
other non-toxic fluid having a toxicity rating
or class of 1, as listed in clinical Toxicology
of Commercial products, 5th edition
LOCATION
The electric boiler should be installed in a clean,
dry location. Long hot water lines should be
insulated to conserve water and energy. The
electric boiler and water lines should be
protected from exposure to freezing
temperature.
The electric boiler must be installed horizontally
directly on the wall. Use the hanging brackets
for leveling the unit The electric boiler must be
located or protected so as not to be subject to
physical damage, for example, by moving
vehicles, area flooding, etc. All models can be
installed on combustible floors and in alcoves.
Ambient temperature must not exceed 80°F.
CLEARANCE
For adequate inspection and servicing the
following minimum clearance is necessary:
Right side 2 inches
Left side 14 inches
Top & Bottom of the boiler 6 inches
Front side of the boiler 24 inches
Back side of the boiler 1 inch
The electric boiler should not be located in
an area where leakage of the tank or water
connections will result in damage to the
adjacent area or to lower floors of the
structure. When such areas cannot be
avoided, a suitable drain pan or non-
flammable catch pan, adequately drained,
and must be installed under the boiler.
The pan must be connected to a drain.
NOTE: Auxiliary catch pan MUST conform to
local codes.
!
CAUTION
!
WARNING
!
CAUTION
!

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 5.
CORROSIVE ATMOSPHERE
The electric boiler should not be located near an
air vent blowing a corrosive atmosphere or high
humidity. The limited warranty is void when the
failure of the electric boiler is due to a corrosive
atmosphere.
CHECK LIST
Please check the identification tag on the unit to
make sure you have the right model.
List of components shipped with the unit :
• Pressure relief valve set at 30 PSI.
• Drain valve.
• Tridicator (temperature & pressure
gage).
SHIPMENT INSPECTION
Inspect the electric boiler for possible shipping
damage. The manufacturer’s responsibility
ceases upon delivery of goods to the carrier in
good condition. Consignee must file any claims
for damage, shortage in shipments, or non-
delivery immediately against carrier.

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 6.
Installation
The manufacturer’s warranty does not cover
any damage or defect caused by installation,
or attachment, or use of any special
attachment other than those authorized by the
manufacturer into, onto, or in conjunction with
the water heater. The use of such
unauthorized devices may shorten the life of
the boiler may endanger life and property. The
manufacturer disclaims any responsibility for
such loss or injury resulting from the use of
such unauthorized devices
WIRING
Wiring must conform to the National Electrical
Code and to state or local code requirements.
The electric boiler must be electrically grounded in
accordance with local codes, or, in the absence of
local codes, with the National Electrical Code.
240Vac models
Wiring must be from a 240 Volt (single phase, 60
Hz) circuit protected by a properly sized breaker.
Wire gage (3 wires, ground) must be properly
sized. Consult the boiler rating plate to select the
proper breaker and wire gage.
600Vac models
Line wiring must be from a 600 Volt ( 3 phase, 60
Hz) circuit protected by a properly sized breaker.
Wire gage (3 wires, ground) must be properly
sized. Consult the boiler rating plate to select the
proper breaker and wire gage.
Circulator zoning wiring
Components must be wired to ensure that only the
circulator corresponding to the zone calling for
heat is actuated.
Zone valve zoning wiring
Connect the low voltage thermostat to the zone
valve. Components must be wired to ensure that
only the zone valve corresponding to the zone
calling for heat is actuated and that the circulator
is powered on a demand from any zone. The
transformer used to power the zone valves must
be sized for the load represented by all zone
valves in the heating system.
BOILER WATER CONNECTIONS
This electric boiler may be connected individually
or in parallel with other boilers. If two or more
boilers are connected, the “reverse-return piping”
method (whereby the boiler with the first return
inlet also has the last supply outlet and so forth
until the last return inlet corresponds to the first
supply outlet) should be used to connect the
boilers in parallel, to ensure an equal water flow
rate through each boiler.
The boiler water supply, located on the top side,
and the boiler water return, located on the bottom
side of the boiler are steel pipes (male NPT
threaded connection) where supply and return line
connections are to be made.
Installing a union is recommended on the boiler
water supply and return lines to facilitate boiler
disconnection for servicing.
Dielectric unions are required for protection of the
boiler and piping if dissimilar pipe material such as
galvanized steel and copper are present.
Use only clean, new piping for boiler water lines.
Local codes or regulations shall govern the exact
type of material to be used.
Insulate all pipes containing hot water, especially
in unheated areas.
Install shutoff (ball) valves for servicing
convenience. Thermometer(s) should be installed
on the boiler water supply and return lines.
Cap or plug unused connections on the boiler. Do
not cap the pressure relief valve on the boiler
since it will damage and shorten the life of the
boiler and may endanger life and property.
Flow check valve
If the heating system includes a single pump, then
to minimize flow by gravity and heat loss during
non-draw periods, a flow check valve must be
installed.
Pressure relief valve
An automatic pressure relief valve must be
installed during boiler setup. The pressure rating
of the relief valve must not exceed 30 psi. The
safety relief valve must meet the requirements of
WARNING
!

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 7.
the ASME Boiler and Pressure Vessel Code and
limit the maximum operating boiler pressure. It is
a safety device, not an operating control.
The BTU per hour rating of the relief valve must
equal or exceed the BTU per hour input of the
boiler(s) or heat source(s) as marked on the
boiler(s) rating plate.
Connect the outlet of the relief valve to a
discharge line with its lower tip at most 6” above a
floor drain, well clear of any live electrical parts.
The discharge line must pitch downward from the
valve to allow complete draining by gravity of the
relief valve and discharge line, and be of a
diameter no smaller than that of the valve outlet.
The tip of the discharge line should not be
threaded or concealed and should be protected
from freezing. No valve of any type, restriction or
reducer coupling should be installed on the
discharge line. Local codes shall govern the
installation of relief valves.
SYSTEM PRESSURE CONTROL
Expansion tank
Pressure control devices within the system ensure
that each component operates within minimum
and maximum allowable pressures and maintain
minimum pressure for all normal operating
temperatures. They also allow air bleeding,
prevent cavitation at the pump inlet and prevent
water from boiling within the system; all this is
accomplished with minimal addition of new water.
The increase in boiler water volume resulting from
higher temperature is stored in the expansion tank
during periods of high operating temperature and
is returned to the system when the temperature
decreases.
The expansion tank must be able to store the
required volume of boiler water during maximum
design operating temperature without exceeding
the maximum allowable operating pressure, and
to maintain the required minimum pressure when
the system is cold. Contact your installing
contractor, plumbing supply house, or local
plumbing inspector for assistance.
The point where the expansion tank is connected
should be carefully selected to avoid the
possibility that normal operation of automatic
check or manual valves will isolate the tank from a
hot boiler or any part of the system. Pre-charged
diaphragm expansion tanks are preferable to air
control.
These tanks incorporate a balloon-like bladder or
diaphragm. It is inflated, prior to filling the system,
to a pressure equal to the setting of the water
pressure makeup regulator.
The expansion tank should be located on the
suction or intake side of the pump. The pump can
be located either just upstream or just
downstream from the boiler.

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 8.
Water pressure makeup regulator
Make-up systems must be employed as required
by codes. An automatic fill valve must be used
with a backflow preventer as required, to maintain
minimum system pressure by supplying water to
make up for leakage.
Air bleeder
Oxygen should be excluded from the system to
prevent corrosion. As mentioned in the expansion
tank paragraph above, this precludes the use of
air in direct contact with the boiler water as a
pressurization means.
Installation of manual or automatic air vent
devices prevents air from accumulating in the
system. Air vents should be installed at all high
points to remove trapped air during initial setup
and to ensure that the system is tight. Regularly
purge the air out of the system while taking care to
avoid personal injuries or property damage
caused by hot boiler water spray.
Circulator zoning recommendations
The preferred location of the circulator pump for
each zone is on the boiler supply side, with the
expansion tank between the boiler and the pump.
A flow check valve must be installed in each zone,
preferably on the outlet side of each circulator
pump, to prevent water flow to other zones where
no heat is required.
Zone valve zoning recommendations
The preferred location of the circulator pump is on
the boiler supply side, with the expansion tank
between the boiler and the circulator. Use zone
valves with low pressure drop.
Dual energy installation
In order to obtain a special rate from your electric
utility for residential use, your BTH boiler can be
hooked-up to an existing oil heater. Contact your
electric utility to find out if your property is eligible
for such rates and how to register for them.
The CBE-EM dual-energy control (an available
option, three-way, motorized valve (1’’ NPT F
standard) included) is specially designed to
electric utility standards. The CBE-EM control
selects the least expensive energy source based
on outside temperature, user choice or a signal
from your utility.
The CBE-EM dual-energy control will start up the
oil burner upon receiving the appropriate signal,
even if the thermostat in the house is not calling
for heat. It will shut off when the temperature in
the boiler reaches its target on the Limit Control. It
is for this reason that the piping requires an anti-
gravity valve (flow check valve) or motorized zone
valves.
A three-way, motorized valve (1’’ NPT F standard)
will direct the water flow either to the oil-fired
heater or to your DTH electric boiler, depending
on the signal received. This way, your oil heater
will cool down and eliminate any energy loss,
either through the chimney or by way of
conduction in the boiler room.

1
2
3
4
5
6
7
8
910
11 12 15
L1 L2 N
16
T=150 F
o o o o o o o o o
H H V1 V2 V3 T1 T2 E1 E 2
E2V2
Legeng/Légende:
1) Main water supply / Alimentation d'eau
2) Maintenance valve/ Valve d'entretien
3) Check valve/ Clapet anti-retour
4) Pressure reducer/ Réducteur de pression
5) Expension tank/ Réservoir d'expansion
6) Circulating pump/ Pompe circulatrice
7) Purge valve/ Robinet élimination d'air
8) Drain valve/ Valve drainage
9) Safety valve/ Valve de sécurité
10) T & P Gage/ Tridicateur
11) Automatic air vent/ Purgeur d'air
12) Flow check valve/ Clapet antigravité
(required on systems without motorised zone valves)
(requise sur les systèmes n'ayant pas de valves motorisées)
14) Dual energy outside sensor/ Sonde ext. Bi-energie
15) Thermostat/ Thermostat
16) Dual energy control CBE-EM/ Contrôle Bi-énergie CBE-EM
17) Motorised 3 way valve/ Valve motorisée 3 voies
14
T
T
L1
N17
jumper/ cavalier
Noir
Bleu
Brun
B
A
AB
Relais
Pompe
Pump
Relay
L N
Schéma d'installation général/
General installation
THERMO 2000 inc.
BTH 240V
Bi-Énergie avec valve 3 voies/
Dual-energy with 3-way valve
Page 9

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 10.
ELECTRIC BOILER WIRING DIAGRAM
L1 G
C1 TH1
TH2
R1 HL C1
Diagramme électrique/ Wiring diagram
BTH 240V
Modèle/Model 6 - 10 KW
Légende/ Legend
Voir/see note 2
OPTION: BTH-BE
Note 1: Bloc terminal (24 VAC) pour une installation avec le
controleur bi-énergie Thermo 2000 modèle: "CBE-EM"/
Terminal block (24 VAC) for an installation with Thermo 2000 dual
energy controller model: "CBE-EM"
Note 2: Couper le cavalier lorsque vous utilisez le controleur
bi-énergie Thermo 2000 modèle: "CBE-EM"/
Cut open this jumper when using Thermo 2000 dual energy
controller model: "CBE-EM"
TH
C
R
HL
Aquastat
Élément chauffant/
Heating element
Commutateur ON/OFF
ON/OFF switch
Contacteur de puissance
Power relay
Relais
Relay
Lampe témoin
Pilot light
Haute limite
Hi-Limit
N
F1
Fusible
Fuse
C1
L2
Disjoncteur
Braker
EL1
EL2
Cablage en usine/
Factory wiring
Cablage par l'installateur/
Wiring by others
V2
E2
R1 Voir/see note 1
OPTION: BTH-BE
F2

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 11.
L1 G
C1
TH1
TH2
R1 HL C1
Diagramme électrique/ Wiring diagram BTH 240V
modèle/ model 12 - 24 KW
Voir/see note 2
OPTION: BTH-BE
N
F1
C1
L2
C1
TH3
TH4
C1
Note 1: Bloc terminal (24 VAC) pour une installation avec le
controleur bi-énergie Thermo 2000 modèle: "CBE-EM"/
Terminal block (24 VAC) for an installation with Thermo 2000 dual
energy controller model: "CBE-EM"
Note 2: Couper le cavalier lorsque vous utilisez le controleur
bi-énergie Thermo 2000 modèle: "CBE-EM"/
Cut open this jumper when using Thermo 2000 dual energy
controller model: "CBE-EM"
Légende/ Legend
TH
C
R
HL
Aquastat
Élément chauffant/
Heating element
Commutateur ON/OFF
ON/OFF switch
Contacteur de puissance
Power relay
Relais
Relay
Lampe témoin
Pilot light
Haute limite
Hi-Limit Fusible Fuse
Disjoncteur
Braker
Voir/see note 3
OPTION B3
EL1
EL2
EL3
EL4
Cablage en usine/
Factory wiring
Cablage par l'installateur/
Wiring by others
V2
E2
R1 Voir/see note 1
OPTION: BTH-BE
F2

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 12.
L1 G
C1
TH1
TH2
R1 HL C1
Diagramme électrique/ Wiring diagram BTH 240V
modèle/ model 27 KW
N
F1
C2
L2
C1
TH3
TH4
C2
C1
TH5
TH6
C2
C2
Note 1: Bloc terminal (24 VAC) pour une installation avec le
controleur bi-énergie Thermo 2000 modèle: "CBE-EM"/
Terminal block (24 VAC) for an installation with Thermo 2000 dual
energy controller model: "CBE-EM"
Note 2: Couper le cavalier lorsque vous utilisez le controleur
bi-énergie Thermo 2000 modèle: "CBE-EM"/
Cut open this jumper when using Thermo 2000 dual energy
controller model: "CBE-EM"
Voir/see note 3
OPTION
Voir/see note 2
OPTION: BTH-BE
Légende/ Legend
TH
C
R
HL
Aquastat
Élément chauffant/
Heating element
Commutateur ON/OFF
ON/OFF switch
Contacteur de puissance
Power relay
Relais
Relay
Lampe témoin
Pilot light Haute limite
Hi-Limit
Fusible
Fuse
Disjoncteur
Braker
EL1
EL2
EL3
EL4
EL5
EL6
Cablage en usine/
Factory wiring
Cablage par l'installateur/
Wiring by others
V2
E2
R1 Voir/see note 1
OPTION: BTH-BE
F2

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 13.
L1 G
C1
TH1
TH2
R1 HL C1
Diagramme électrique/ Wiring diagram BTH 240V
modèle/ model 30-33 KW
N
F
C2
L2
C1
TH3
TH4
C2
C1
TH5
TH6
C2
C2
B1 B2 B3
Note 1: Bloc terminal (24 VAC) pour une installation avec le
controleur bi-énergie Thermo 2000 modèle: "CBE-EM"/
Terminal block (24 VAC) for an installation with Thermo 2000 dual
energy controller model: "CBE-EM"
Note 2: Couper le cavalier lorsque vous utilisez le controleur
bi-énergie Thermo 2000 modèle: "CBE-EM"/
Cut open this jumper when using Thermo 2000 dual energy
controller model: "CBE-EM"
B1 B2 B3 B4 Voir/see note 2
Légende/ Legend
TH
C
R
HL
Aquastat
Élément chauffant/
Heating element
Commutateur ON/OFF
ON/OFF switch
Contacteur de puissance
Power relay
Relais
Relay
Lampe témoin
Pilot light Haute limite
Hi-Limit
Fusible
Fuse
Disjoncteur
Braker
EL1
EL2
EL3
EL4
EL5
EL6
Cablage en usine/
Factory wiring
Cablage par l'installateur/
Wiring by others
V2
E2
R1
Voir/see note 1

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 14.
L1 L2 G
C1
TH1
R3
HL
V2
E2
R3
Diagramme électrique/ Wiring diagram BTH 600V
modèle/ model 9 - 13 KW
Voir/see note 1
OPTION: BTH-BE
Voir note 2
OPTION: BTH-BE
L3
R1
C1 C1 C1
R1
R1
600 V
120 V
Transfo
F1 F2
EL1
EL2
EL3
Note 1: Bloc terminal (24 VAC) pour une installation avec le
controleur bi-énergie Thermo 2000 modèle: "CBE-EM"/
Terminal block (24 VAC) for an installation with Thermo 2000 dual
energy controller model: "CBE-EM"
Note 2: Couper le cavalier lorsque vous utilisez le controleur
bi-énergie Thermo 2000 modèle: "CBE-EM"/
Cut open this jumper when using Thermo 2000 dual energy
controller model: "CBE-EM"
Légende/ Legend
TH
C
R
HL
Aquastat
Élément chauffant/
Heating element
Commutateur ON/OFF
ON/OFF switch
Contacteur de puissance
Power relay
Relais
Relay
Lampe témoin
Pilot light Haute limite
Hi-Limit
Fusible
Fuse
Disjoncteur
Braker

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 15.
L1 L2 G
C1
TH1
R3
HL
V2
E2
R3
Diagramme électrique/ Wiring diagram BTH 600V
modèle/ model 18 - 36 KW
Voir/see note 1
OPTION: BTH-BE
Voir note 2
OPTION: BTH-BE
L3
R1
C1 C1 C1
R1
R1
600 V
120 V
Transfo
F1 F2
EL1
EL2
EL3
Note 1: Bloc terminal (24 VAC) pour une installation avec le
controleur bi-énergie Thermo 2000 modèle: "CBE-EM"/
Terminal block (24 VAC) for an installation with Thermo 2000 dual
energy controller model: "CBE-EM"
Note 2: Couper le cavalier lorsque vous utilisez le controleur
bi-énergie Thermo 2000 modèle: "CBE-EM"/
Cut open this jumper when using Thermo 2000 dual energy
controller model: "CBE-EM"
Légende/ Legend
TH
C
R
HL
Aquastat
Élément chauffant/
Heating element
Commutateur ON/OFF
ON/OFF switch
Contacteur de puissance
Power relay
Relais
Relay
Lampe témoin
Pilot light Haute limite
Hi-Limit
Fusible
Fuse
Disjoncteur
Braker
TH2 R2
R2
R2
EL4
EL5
EL6

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 16.
L1 Diagramme électrique/ Wiring diagram
Contrôle Bi-énergy/ Dual control energy CBE-EM N
120 Vac
24 Vac
HH
V3
V2
E1
E2
T1
T2
Bi-energie/ Dual energy
Electrique/ Electric
Mazout/ Oil
Relais BTH/
BTH Relay
E2 V2
T
T
Relais chaudière
mazout/
Oil boiler Relay
Noir/ Black
V1 Brun/ Brown
Bleu/ Blue
B
AB
A
Electrique/ Electric
Mazout/ Oil
SPDT
Relais/ Relay
Interrupteur DPDT
Switch ON-OFF-ON
Sonde extérieur/
Outdoor sensor
Transfo
Lumière haut tarif/
High tarif light
Valve 3 voies optionnelle/
Optional 3-way valve
Cablage en usine/
Factory wiring
Cablage par l'installateur (chaudière BTH)/
Wiring by others (BTH Boiler)
H H V1V2 V3 T1 T2 E1 E2
Valve 3 voies optionnelle/
Optional 3-way valve
Sonde extérieur/
Outdoor sensor
Noir/ Black
Brun/ Brown
Bleu/ Blue
Lumière haut tarif/
High tarif light
Transfo
120 Vac
24 Vac
Interrupteur DPDT
Switch ON-OFF-ON
Bi-energie/ Dual energy
Electrique/ Electric
Mazout/ Oil
SPDT
Relais/ Relay
Chaudière électrique BTH
Electric boiler BTH
("E2 V2" bornier 24 Vac/
terminal E2-V2)
Chaudière mazout
Oil boiler
("T T" relais de combustion/
oil boiler burner)

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 17.
Basic Piping Schematics
B T H
6
7
8
910
11 12
13
14
5
1
2
4
3
SYSTEM PIPINGLAYOUT:/
SCHEMA D'INSTALLATIONGÉNÉRAL:
VALVEZONINGTOBASEBOARDS/
ZONAGEDEPLINTHESPARROBINETSMOTORISÉS
8-DRAIN VALVE/ VALVE DRAINAGE
11-AUTOMATIC AIR VENT/ PURGEUR D'AIR
9-SAFETY VALVE/ SOUPAPE DE SÛRETÉ
12-FLOW CHECK VALVE (REQUIRED ON SYSTEMS
WITHOUT MOTORIZED ZONE VALVES)/
CLAPET ANTI-GRAVITÉ (REQUIS SUR SYSTÈME
N'AYANT PAS DE ROBINETS MOTORISÉS)
14-HOT WATER BASEBOARD/ PLINTHES CHAUFFAG
E
13-MOTORIZED ZONE VALVE/ ROBINETS MOTORISÉ
S
10-TEMPERATURE AND PRESSURE GAUGE/
THERMOMANOMÈTRE
1- MAIN WATER SUPPLY/ ALIMENTATION D'EAU
2-MAINTENANCE VALVE/ VALVE D'ENTRETIEN
3-CHECK VALVE/ CLAPET ANTI-RETOUR
4-PRESSURE REDUCER/ RÉDUCTEUR DE PRESSION
5-EXPANSION TANK/ RÉSERVOIR DE DILATATION
6-CIRCULATING PUMP/ POMPE CIRCULATRICE
7-PURGE VALVE/ ROBINET D'ÉLIMINATION D'AIR
LEGEND/ LÉGENDE :
Requirements:
1. The installation must conform to local, state, provincial, national codes. In any case where instructions conflict with the above,
let those codes take precedence.
2. This is a basic piping schematic. Please consult the installation manual.
3. Install a pressure relief valve (safety relief valve) on the boiler.
4. Pipe all the safety relief valves and drain valves to the drain or according to the code

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 18.
B T H
7
8
910
5
1
2
4
3
11
612
14
13
TYP.: 105°F
TYP.: 90°F
SYSTEMPIPINGLAYOUT:/
SCHÉMAD'INSTALLATIONGÉNÉRAL
DIRECTBOILERWATERSUPPLYTORADIANTHEATINGLOOP/
PLANCHERCHAUFFANTDIRECT
1- MAIN WATER SUPPLY/ ALIMENTATION D'EAU
2-MAINTENANCE VALVE/ VALVE D'ENTRTIEN
3-CHECK VALVE/ CLAPET ANTI-RETOUR
4-PRESSURE REDUCER/ RÉDUCTEUR DE PRESSION
5-EXPANSION TANK/ RÉSERVOIR DE DILATATION
6-CIRCULATING PUMP/ POMPE RECIRCULATION
7-PURGE VALVE/ ROBINET D'ÉLIMINATION D'AIR
8-DRAIN VALVE/ VALVE DE DRAINAGE
11-AUTOMATIC AIR VENT/ PURGEUR D'AIR
9-SAFETY VALVE/ SOUPAPE DE SÛRETÉ
12-SUPPLY HEADER/ COLLECTEUR D'ALIMENTATION
14-RADIANT IN-FLOOR PIPING/ PLANCHER CHAUFFANT
13-RETURN HEADER/ COLLECTEUR DE RETOUR
10-TEMPERATURE AND PRESSURE GAUGE/ THERMOMANOM
ÈT
LEGEND/ LÉGENDE :
Requirements:
1. The installation must conform to local, state, provincial, national codes. In any case where
instructions conflict with the above, let those codes take precedence.
2. This is a basic piping schematic. Please consult the installation manual.
3. Install a pressure relief valve (safety relief valve) on the boiler.
4. Pipe all the safety relief valves and drain valves to the drain or according to the code.

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 19.
B T H
9
5
1
2
4
3
11
12
14
13
6
7
8
10
15
16
TYP: 85°F
TYP.:150°F
17
18
20
19
SYSTEMPIPINGLAYOUT:/
SCHÉMAD'INSTALLATIONGENERAL
MODULATINGBOILERWATERSUPPLYTORADIANTHEATINGLOOP/
PLANCHERCHAUFFANTMODULANT
11-AUTOMATIC AIR VENT/ PURGEUR D'AIR
12-SUPPLY HEADER/ COLLECTEUR D'ALIMENTATION
14-RADIANT IN-FLOOR PIPING/ PLANCHER CHAUFFANT
13-RETURN HEADER/ COLLECTEUR DE RETOUR
1- MAIN WATER SUPPLY/ ALIMENTATION D'EAU
2-MAINTENANCE VALVE/ VALVE D'ENTRETIEN
3-CHECK VALVE/ CLAPET ANTI-GRAVITÉ
4-PRESSURE REDUCER/ RÉDUCTEUR DE PRESSION
5-EXPANSION TANK/ RÉSERVOIR DE DILATATION
6-CIRCULATING PUMP/ POMPE RECIRCULATION
8-DRAIN VALVE/ VALVE DE DRAINAGE
9-SAFETY VALVE/ SOUPAPE DE SÛRETÉ
7-PURGE VALVE/ ROBINET D'ÉLIMINATION D'AIR
10-TEMPERATURE AND PRESSURE GAUGE/
THERMOMANOMÈTRE
LEGEND :
15-INJECTION VALVE (SLOW OPENNING)/
VALVE D'INJECTION
16-CIRCUIT BALANCING VALVE/ VALVE DE BALANCEMENT
18-BOILER WATER SUPPLY TEMP. SENSOR/
SONDE DE TEMPÉRATURE D'EAU
19-EXTERIOR TEMPERATURE SENSOR/ SONDE TEMP. EXT.
17-INDOOR / OUTDOUR CONTROLLER/
CONTRÔLEUR MODULANT INT.-EXT.
20-AMBIANT TEMPERATURE SENSOR/ SONDE TEMP. AMBIANTE
Requirements:
1. The installation must conform to local, state, provincial, national codes. In any case where instructions conflict with the
above, let those codes take precedence.
2. This is a basic piping schematic. Please consult the installation manual.
3. Install a pressure relief valve (safety relief valve) on the boiler.
4. Pipe all the safety relief valves and drain valves to the drain or according to the code.

BTH Electric Boilers USE & CARE MANUAL (Revision August /06), Page 20.
PUMP AND PUMP SIZING
Boiler water temperature drop (BWTD)
through the heating loop
A simplified design method based on a 20°F
temperature drop (BWTD) between boiler outlet
and inlet is commonly used. Although such a
method is widely used and generates
satisfactory system performance when applied
properly, it does not determine the system
operating point. The pipe size is often
uneconomically large, and the actual system
flow rate is likely to be much higher than
intended. Such design methods seldom
consider temperature drops higher than 20°F,
which results in overdesign.
Another method by which the boiler water
temperature drop (BWTD) could be calculated
is to assume a constant supply boiler water
temperature minus the return boiler water
temperature. For example a boiler might have a
return temperature of 140 °F. Assuming a
constant supply boiler temperature of 180 °F,
the BWTD would be 40 °F ( = 180 °F – 140 °F).
Second example: If the boiler water has a return
temperature of 120 °F and the boiler supply is at
140 °F, then the temperature drop is 20 °F (=140
°F – 120 °F).
By design the boiler water supply temperature
cannot be higher than 190°F. Also, when the
boiler surfaces are hot due to previous loads
such as domestic hot water generation, the large
temperature difference between the boiler and
its return water can cause the boiler to become
thermally shocked.
An experienced designer could work with other
values than those proposed by looking into the
performance tables and using the guidelines
stated above to design a state of the art system.
The following chart suggests the temperature
drop (BWTD) to be used to calculate the pump
flow rate.
PROPOSED BOILER WATER
TEMPERATURE DROP THROUGH THE
HEATING CIRCUIT (BWTD)
System
type
Boiler
water
Supply
tempera-
ture
Boiler
water
Return
tempera-
ture
BWTD
Baseboards 190°F to
140°F 170°F to 120°F 20°F to 40°F
Cast Iron
Radiators 160°F to
130°F 140°F to 110°F 20°F to 40°F
Radiant
In-Floor 130°F to
90°F 110°F to 70°F 20°F to 40°F
Pump flow rate calculation
The boiler’s output rating must correspond to the
heating load calculations or be within the sizing
guide recommendations. Use the equation
below to calculate the pump flow rate.
Pump flow rate = Boiler output ÷
BWTD ÷500
• Pump flow rate is express in U.S. gallons
per minute or GPM.
• The Boiler output ( in net BTU per hour) is
the maximum heat to be transferred through
the heating loop to meet the heating
demand.
• BWTD is the boiler water temperature drop
through the heating loop.
For example, a BTH 24 as an output rated at
81,888 BTU per hour. The system is designed
for a temperature drop (TD) of 20°F.
Pump flow rate = 81,888 ÷20 ÷500 = 8.2 GPM.