Super Hot BT Series Manual

PN4152451
INSTALLATION AND SERVICE MANUAL
FOR HYDRONIC HEATING APPLICATIONS
6 kW to 54 kW, 208 Vac to 600 Vac, Sin
g
le or Three Phase
BT SERIES ELECTRIC BOILER
WARNING
Risk of electric shock. This unit may be connected to more than one
electrical circuit. Disconnect all electrical circuits before servicing.
IMPORTANT
• The boiler must be installed in accordance with all applicable national, provincial/state,
and local codes, laws, regulations, and ordinances.
• This manual must be left with owner and should be located adjacent to the boiler for
reference.
• Ensure boiler is full of water before turning on electricity. Elements will burn out
immediately without water in the boiler.
• A boiler installed above radiation level (or as required by an Authority having
jurisdiction) must be provided with a low-water cut-off device at the time of boiler
installation.
• Overcurrent protection between the power supply and the boiler must be provided in
accordance with the related national and/or local codes.
• Always ensure power is turned off before servicing.
• Electrical wiring or internal controls must be serviced by a qualified electrician. Any
adjustment of the internal controls must be performed by a qualified service technician.
Manufactured by
Allied Engineering Company
Division of E-Z-Rect Manufacturing Ltd.
Manufacturers of Gas and Electric Boilers, Stainless Steel Tanks, Tankless Coils, Electric Boosters
94 Riverside Drive, North Vancouver, B.C. V7H 2M6 •Telephone [phone] •FAX [phone]
Branches: Calgary •Edmonton •Toronto
Post these instructions in a visible place.
DATE OF INSTALLATION :
INSTALLED BY :
PHONE :
Featuring our newest
“BiTronic Control System”
(
OPTIONAL
)

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
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Dimensions and Specifications Section 1
1.1 TECHNICAL SPECIFICATIONS
Maximum Operating Pressure: 90 p.s.i.
Maximum Operating Water Temperature: 210ºF
Water Capacity in Boiler: 6.6 US Gallons
Inlet and Outlet Pipe Size: 1 1/4” NPT
Controller Pump Switch Capacity: 5A Maximum
Table 1: Super Hot BT Series Electric Boiler Specifications. (Flange Type Elements)
Single Phase Three Phase
Super Hot
BT Series Electric Boilers 208 Vac 240 Vac 208 Vac 240 Vac 480 Vac 600 Vac
Model kW Btu/Hr Amp Amp Amp Amp Amp Amp
6BT 6 20,474 28.9 25.0 16.7 14.4 7.2 5.8
9BT 9 30,708 43.3 37.5 25.0 21.6 10.8 8.7
12BT 12 40,848 57.7 50.0 33.3 28.8 14.4 11.5
15BT 15 51,185 72.1 62.5 41.6 36.0 18.0 14.4
18BT 18 61,422 86.5 75.0
54.6*47.3*23.7*18.9*
20BT 20 68,240 96.2 84.3
63.6*55.1*27.6*22.0*
24BT 24 81,895 115 100 66.5 57.7 28.8 23.1
27BT 27 92,124 130 113 74.9 64.9 32.4 26.0
30BT 30 102,369 144 125 83.2 72.1 36.0 28.8
34BT 34 116,008 164 142
100*87.0*43.5*34.8*
38BT 38 129,656 183 158
118*102*50.5*40.4*
42BT 42 143,304 202 175 116 101 50.5 40.4
45BT 45 153,540 216 188 125 108
57.7*46.2*
48BT 48 163,776 231 200
138*119*59.6*47.7*
54BT 54 184,248 260 225 150 130 64.9 52.0
Note:
1. Other models of the BT Series Electric Boiler may be available subject to inquiry.
2. * Delta connection (unbalanced load) amperage of high leg indicated.
3. Approximate shipping weights:
Model Weight
Ŧ
6BT & 9BT 114 lb
12BT to 18BT 116 lb
20BT & 24BT 118 lb
27BT to 38BT 122 lb
42BT to 54BT 126 lb
ŦAdd 45 lb for package models

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
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1.2 WATER TEMPERATURE RISE vs FLOW RATE
NOTE: The boiler should be properly sized for its heating application and maintain an adequate water
flow rate during operation. Significantly oversizing the boiler or decreasing boiler water flow
rate will cause excessive stage cycling and result in premature failure of the contactors.
Water flow rate vs temperature rise formulas in US gallons per minute (GPM) and liters per minute (LPM):
6.94 x kW 14.6 x kW
GPM = Temp. Rise (°F) LPM = Temp. Rise (°C)
Table 2: Water Temperature Rise vs Flow Rate in GPM (LPM)
Model KW
10°F (5.6°C) 20°F (11°C) 30°F (17°C) 40°F (22°C)
6BT 6 4.2 (16) 2.1 (8) 1.4 (5) 1.0 (4)
9BT 9 6.2 (23) 3.1 (12) 2.1 (8) 1.6 (6)
12BT 12 8.3 (31) 4.2 (16) 2.8 (10) 2.1 (8)
15BT 15 10.4 (39) 5.2 (20) 3.5 (13) 2.6 (10)
18BT 18 12.5 (47) 6.2 (24) 4.2 (15) 3.1 (12)
20BT 20 13.9 (52) 6.9 (27) 4.6 (17) 3.5 (13)
24BT 24 16.6 (63) 8.3 (32) 5.5 (21) 4.2 (16)
27BT 27 18.7 (70) 9.4 (36) 6.2 (23) 4.7 (18)
30BT 30 20.8 (78) 10.4 (40) 6.9 (26) 5.2 (20)
34BT 34 23.6 (89) 11.8 (45) 7.9 (29) 5.9 (23)
38BT 38 26.4 (99) 13.2 (50) 8.8 (33) 6.6 (25)
42BT 42 29.1 (109) 14.6 (56) 9.7 (36) 7.3 (28)
45BT 45 31.2 (117) 15.6 (60) 10.4 (39) 7.8 (30)
48BT 48 33.3 (125) 16.6 (64) 11.1 (41) 8.3 (32)
54BT 54 37.5 (141) 18.7 (72) 12.5 (46) 9.4 (36)
1.3 GENERAL DIMENSIONS
Figure 1 – General Dimensions

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
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Installation Instructions Section 2
2.1 RECEIVING
INSPECT SHIPMENT FOR POSSIBLE DAMAGE. All goods are carefully manufactured, inspected,
checked and packed by experienced workers. The manufacturer's responsibility ceases upon delivery of
goods to the carrier in good condition. Any claims for damage, shortage in shipment or non-delivery must
be filed immediately against the carrier by the consignee.
2.2 INTRODUCTION
Super Hot Electric Boilers are controlled by a three-stage electronic temperature controller. The
controller controls the boiler water temperature with three stages and turns stages on based on the
heating demand, time delay, and the preset boiler outlet water temperature. The controller also can
control 120Vac circulating pumps rated up to 5A or 600VA. When the thermostat calls for heat, the
controller will operate the boiler to regulate the water temperature at a pre-selected setpoint. The system
pump is on whenever there is a thermostat calling for heat.
Multi-stage electric boilers have a number of advantages over conventional on/off single stage boilers.
Instead of switching on/off all heating elements using sequencers, each stage of a multi-stage boiler is
controlled directly by the controller to minimize both temperature fluctuations and reduce the number of
on/off operations of the contactors/heating elements. The on/off times of each of the stages are
separated by a pre-determined minimum time interval to avoid a surge in line current. The average “cycle
time” of each of the heating elements shall be greatly increased. This ensures better temperature
stability, extends the life of the boiler and increases energy efficiency.
2.3 BOILER LOCATION
The boiler is intended for indoor installation only and must not be subjected to water spray or leakage. It
may be installed in an enclosed space and attached directly to a combustible surface. Allow ample space
around the boiler to ensure all connections and controls are readily accessible. The minimum required
clearances for service are shown in the following table:
Minimum Clearance Provides service access for
left side = 18 inches elements
right side = 12 inches plumbing connections
front = 12 inches electrical components and fuses
It may be preferred to locate the boiler close to the electrical supply panel.

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
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2.4 WALL MOUNTING
CAUTION: Failure to correctly position the boiler may result in element burn out.
This boiler must be installed using the attached wall mounting brackets. It is critical that the boiler be
installed level and oriented as shown in Figure 2 (below). When correctly positioned, the front panel is
vertical and the 1 1/4”NPT outlet connection is directly above the 1 1/4”NPT inlet connection.
The wall mounting brackets on the boiler feature a “key-hole” opening suitable to fit over the head of two
previously installed 5/16” lag screws. The key-hole openings are located on 16” centers (i.e. standard
stud spacing) on the top side of the hangers. The lag screws must be suitably anchored to safely support
the weight of the boiler including water content, piping and wiring.
2.5 PIPING
The recommended piping arrangement is shown in Figure 2. Attach pump, expansion tank, drain valve,
pressure relief valve, air vent, pressure temperature gauge and flow switch (as required). Air vents
should be installed at points just upstream from all drops in elevation of the piping system (high points).
A boiler installed above radiation level, or as required by an authority having jurisdiction, must be
provided with a low-water cut-off device at the time of boiler installation.
Figure 2 – Piping Arrangement

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
6
Wiring Section 3
3.1 ELECTRICAL WIRING
All electrical wiring must be done in accordance with the Canadian Electrical Code, CSA C22.1 Part 1,
and/or any local regulations and codes in Canada, or the National Electrical code, ANSI/NFPA 70 (latest
edition) and/or any local regulations and codes in U.S.A.. Verify the nameplate rating and check the
related codes to properly size conductors, switches and overcurrent protection. Several openings are
provided on the right and bottom of the casing for different voltage connections. For wire connections
refer to the wiring diagram sticker on the back of the boiler front cover.
All circuit breakers ahead of and at the boiler must be OFF. Remove the boiler front cover by removing 4
screws from the sides.
a. Wiring on Controller
Line Voltage:
Connect (if not pre-wired) only 120 Vac, 60 Hz, single phase power to terminals L1 and L2 on
the controller. Strip wire ends before inserting into terminal block. Tighten terminal screw
clamps.
Pump:
Connect only 120 Vac, 1/6 HP (maximum) pump to terminals P1 and P2 on the controller.
Strip wire ends before inserting into terminal block. Tighten terminal screw clamps. If a pump
horsepower larger than 1/6 HP is used, change the pump fuse on the controller based on the
pump rating. Do not use a pump requiring greater than 5A or 600 VA.
Thermostat:
Connect thermostat or zone valve end switch to terminals T1 and T2 (DO NOT apply any
power to these terminals!). Strip wire ends before inserting into terminal block. Tighten
terminal screw clamps.
Water Temperature Control Sensors:
Pre-wired (factory wiring) high-limit temperature sensor to terminals HL and CL (common).
Strip wire ends before inserting into terminal block. Tighten terminal screw clamps.
Pre-wired (factory wiring) operating temperature sensor to terminals OL and CL (common).
Strip wire ends before inserting into terminal block. Tighten terminal screw clamps.
b. Power Supply to Heaters
The supply cable has to be sized based on the amperage in Table 1 and the cables used.
Connect only specified line voltage and phase power to main terminal block on the control panel.
Strip wire ends before inserting into terminal block. Tighten terminal screw clamps. Attach ground
wire to ground terminal block on the bottom control panel.
NOTE: "Outdoor Reset" controllers must not be connected to the Bitronic Control System. Outdoor
Reset controllers will interfere with the Bitronic controller's normal staging routine, and lead to
excessive stage cycling and premature failure of the contactors.

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
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Startup Instructions Section 4
4.1 WARNING
WARNING
The following instructions are intended as a guide for qualified persons. Before switching the
power on, fill the system with water and vent air. Check for and repair any leaks in the water
piping.
4.2 STARTUP
a. Fill System
Figure 2 shows the suggested set-up for a make-up water supply using a pressure regulator (not supplied
by manufacturer). Do not apply full line make-up water pressure to the system. Fill the system to
approximately 12 psi (cold water) if the expansion tank is pressurized at 12 psi. The expansion tank
should be sized to provide the system with enough volume for thermal expansion and contraction while
maintaining operating pressures within safe and reasonable limits. There should be no significant
pressure fluctuations in systems having both an effective automatic fill valve and a properly sized
expansion tank or expansion tank arrangement. The standard pressure relief valve supplied with the
boiler is rated at 30 psi, or as required by order, but the maximum working pressure cannot exceed 90 psi
for CSA or A.S.M.E. approved boiler. Once the system is filled with water, all trapped air must be
removed to avoid air locks, which can reduce flow rate and cause thermal shock. Figure 2 also illustrates
the connections to the air purger (not supplied by manufacturer) and expansion tank in the line from the
boiler to the radiation units. Additional air purgers should be installed at high points in the system to
assist in removing air which can accumulate from the water supply line. All high points must be vented.
b. Startup Procedure
Perform the following procedure as a check for proper boiler and system operation:
1. Set the boiler operating temperature to the designed heating water temperature by adjusting the dial
of potentiometer located on the bottom-left of the controller (Figure 3). Use a small screwdriver to
adjust the arrow on the temperature adjustment dial to the water temperature required. (This boiler is
also equipped with a non-adjustable, high-limit temperature device set at 230°F as safety limit control.
The high limit temperature device has an automatic reset function.)
2. The stage 1, stage 2, and stage 3 contactors are each connected in series with Anti-Cycle Cubes.
Use a small screwdriver to adjust the arrow on the Cube adjustment dial to the required stage time
delay. The recommended Anti-Cycle Cube settings are two minutes for stage 1, five minutes for
stage 2 and eight minutes for stage 3. Minimum Settings: The stage 1 Cube should be set at a
minimum of one minute. The stage 2 Cube should always be set a minimum of two minutes longer
than stage 1.The stage 3 Cube should always be set a minimum of two minutes longer than
stage 2.
3. Turn up all room thermostats above room temperature.
4. When power is supplied to the controller, the power indicator LED (green) is always on. When the
thermostat calls for heat, the pump will be energized immediately and the pump indicator LED
(yellow) will light up. Next, the three stages are energized along with the stage indicator LEDs
(yellow), one after another, in sequence and based on the time delay which is user-set by the Anti-
Cycle Cubes. Once the boiler water temperature reaches the set point on the temperature adjustment
dial, the controller will regulate the boiler water temperature with three stages. The number of stages
which stay on is based on the heating demand and the set point of the boiler water temperature.
After all room thermostats are satisfied with the heat, the controller de-energizes the three stages one
after another, in sequence, and then switches the pump off.
5. Current may be checked by a qualified electrician at the feeder panel and compared to the values
shown in Table 1.

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
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Maintenance Instructions Section 5
5.1 SERVICE HINTS
a. This boiler has been designed to provide years of trouble free performance under normal operating
conditions. However, the owner should conduct a general external examination at the beginning of
each heating season and at mid-heating season to assure good working performance is continued. In
addition, a qualified service technician should examine the boiler at least once every year.
b. Do not store anything against the boiler or allow dirt or debris to accumulate in the area immediately
surrounding the boiler.
c. Elements will burn out if the boiler is not filled with water when electrical power is turned on. Do not
connect thermostat wires until system has been filled with water. Water should be drained out from
system only when absolutely necessary to make repairs or prevent freeze-up during extended cold
weather shutdown.
d. The pressure & temperature gauge on the system should be checked frequently. During normal
operating conditions, pressure should be relatively stable throughout the heating season. If pressure
under normal operating conditions consistently rises and falls over a period of time, this can indicate
a fill valve leak, system leak or expansion tank malfunction. Leaks anywhere in the system must be
repaired without delay. If any leaks or significant pressure fluctuations are observed, call for service
immediately.
Controller Information Section 6
6.1 BiTRONIC CONTROLLER INFORMATION
BiTronic Control Board Specifications
BiTronic Controller Layout: see figure 3
Dimensions: 8 1/2" (L) x 3 1/4" (W) x 1 3/4" (H)
High Limit Control Outlet Water Temperature: 230 °F (fixed)
Operating Control Outlet Water Temperature: 100 - 210 °F (adjustable)
Controller Input Voltage: 120 Vac
Controller Output Voltage: 24 Vac (stage relays)
120 Vac (pump terminal)
Figure 3 – BiTronic Controller Layout

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
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Transformer:
Power Rating: 40 VA
Input Voltage: 120 Vac, 60 Hz, single phase
Output Voltage: 24 Vac, 60 Hz
Power Output:
1. Three 24 Vac, 3 AMP relays drive stage 1, stage 2 and stage 3. Maximum load of the
individual drive or the total load of three relays should not exceed 1.33 A or 32 VA.
2. One 120 Vac pump output is switched by using a 10A relay. The load current of this output is
also limited by the pump fuse selected (controller supplied with 3 A fuse) and must not
exceed 5 A or 600 VA.
Power Consumption:
Controller (internal): 4 watts maximum
24 Vac contactor drive: depends on the contactors
LED Displays:
A total of seven indicator lights display the following information:
1. Hi-limit (red): High-limit or high-limit sensor error. LED is lit when either the boiler water
temperature reaches the high-limit of 230°F or the high-limit sensor is
faulty, disconnected or misconnected.
2. Sensor (red): Operating sensor error. LED is lit when operating sensor is faulty,
disconnected or misconnected.
3. Power (green): Power on/off.
4. Pump (yellow): Pump relay on/off.
5. Stage 1 (yellow): Boiler first stage on/off (low heat).
6. Stage 2 (yellow): Boiler second stage on/off (medium heat).
7. Stage 3 (yellow): Boiler third stage on/off (high heat).
Signal/Control Input:
T1 and T2: Thermostat or zone valve end switch, switching input, closed is activation.
HL: High-limit temperature sensor.
CL: Common return of the high-limit and the operating temperature sensors.
OL: Operating temperature sensor.
Temperature Control Ranges:
Temperature notation: degrees Fahrenheit
Pre-set operating temperature range: 100°F to 210°F
Fixed high-limit temperature: 230°F
All stages on/off temperature differential: ±4°F
Operating Temperature Adjustment:
Internal temperature potentiometer on the controller or external temperature potentiometer
(optional extra).
Anti-Cycle Cube (external):
Delay "On Make" Time Range: 0.1 to 8 minutes (adjustable)
Input Voltage: 24 V
Maximum Load Current: 1 Amp

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
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6.2 CONTROLLER OPERATION
When the controller is powered-up, the green “Power” light will come on. If no sensor or high limit errors
are present, the controller enters the operating mode. Once in operating mode, the controller uses the
operating sensor to continuously monitor the boiler water temperature.
When the thermostat calls for heat, the controller will switch on the system pump and the yellow “Pump”
light. The control system will switch on the each stage(s) with yellow “Stage” light(s) in sequence followed
between each stage with an interstage delay as set by the Anti-Cycle Cube. When the yellow "Stage"
light for stage 2 or stage 3 switches on, the Anti-Cycle Cube will begin counting delay time to energize its
stage contactor(s) and will energize its stage contactor(s) only after the time delay has elapsed. This
feature prevents "short cycling", which can quickly wear out contactors and cause rapid temperature
fluctuations.
The elements will stay on until the supply water temperature reaches the temperature dial setting. When
the water temperature setpoint is reached, the control will automatically cycle the stage(s) of the boiler on
or off, as necessary, to maintain the supply water temperature. The required number of stages which are
activated is determined by the heating demand (difference between boiler water temperature and design
temperature setpoint). After the call for heat has been satisfied, the stage(s) of the boiler, along with the
"Stage" light(s), will switch off in sequence, followed by the pump.
All stage outputs will shut off within 15 seconds upon a sensor short circuit. The shut down sequence will
switch off one activated element at a time and then the pump. All stage outputs will shut off immediately
followed by the pump after a delay, if the high-limit temperature is reached or there is a sensor open
circuit. The controller has a built-in automatic reset function upon power interruption.
6.3 TEMPERATURE SETTING
The water temperature adjustment dial on the controller should always be set at the designed boiler water
temperature. A small screwdriver should be used to adjust the arrow on the temperature adjustment dial.
6.4 ANTI-CYCLE CUBE SETTING
The stage 1, stage 2, and stage 3 contactors are each connected in series with Anti-Cycle Cubes. Use a
small screwdriver to adjust the arrow on the Cube adjustment dial to the required stage time delay. The
recommended Anti-Cycle Cube settings are two minutes for stage 1, five minutes for stage 2 and eight
minutes for stage 3. Minimum Settings: The stage 1 Cube should be set at a minimum of one
minute. The stage 2 Cube should always be set a minimum of two minutes longer than stage 1.
The stage 3 Cube should always be set a minimum of two minutes longer than stage 2.
6.5 CONTROLLER MOUNTING
The controller mounts on the boiler control panel using six #6 sheet metal screws and 1/2" high plastic
standoffs. The indicator LEDs are visible on the top of the boiler casing.
6.6 PROTECTION FROM LIQUIDS
The controller and other components located within the control panel are sensitive to water and other
liquids. Measures must be taken to fully protect components on the control panel from contact with
liquids. This especially applies to overhead pipes which may leak or condensate causing damage.

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
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Troubleshooting Guide Section 7
7.1 TROUBLESHOOTING – For Use of Licensed Electricians Only
WARNING
RISK OF ELECTROCUTION – HIGH VOLTAGE - ALWAYS SHUT OFF MAIN POWER TO THE
ELEMENT HEATING CIRCUIT BEFORE TROUBLESHOOTING! Also, be careful of 120V power
while troubleshooting near Line-in terminals (L1&L2), Pump terminals (P1&P2) and other areas
of the controller.
This section is meant to assist the service technician when troubleshooting the electric boiler. As in any
troubleshooting procedure, it is important to isolate a problem as much as possible before proceeding.
Often the controller error message LEDs can be a great help in identifying the cause of a problem. If you
suspect a wiring fault, carefully check all external wiring and wiring connections following the wiring
diagram sticker on the back of the boiler's door. An additional wiring diagram is enclosed with this
manual.
PROBLEM CAUSE SOLUTION / CHECK
• Incorrect supply power. • Check for 115V (AC) across L1 and
L2.
• Controller fuse blown. • Check fuse and replace if necessary.
Power LED (green) is not lit.
• Internal control fault. • Replace controller.
• High-limit wire is disconnected or
misconnected
• Red wire of sensor must be connected
to HL.
• Operating sensor fault (allows water
temperature to reach the high-limit)
• Perform "Sensor Check" described in
7.2 and replace sensor if necessary.
• High-limit sensor fault • Perform "Sensor Check" described in
7.2 and replace sensor if necessary.
High-Limit LED (red) on controller is lit.
• Internal control fault • Perform "Sensor Check" described in
7.2 and replace control board if
necessary.
• Operating sensor wire is disconnected
or misconnected.
• White wire of sensor must be
connected to OL.
• Operating sensor fault. • Perform "Sensor Check" described in
7.2 and replace sensor if necessary.
Sensor LED (red) on controller is lit.
• Internal control fault. • Perform "Sensor Check" described in
7.2 and replace control board if
necessary.
• Neutral wire of sensors is
disconnected or misconnected.
• Black wire of sensors must be
connected to CL.
• High-limit or operator sensor fault. • Perform "Sensor Check" described in
7.2 and replace sensor if necessary.
Both High-Limit and Sensor LEDs (red)
on controller are lit.
• Internal control fault. • Perform "Sensor Check" described in
7.2 and replace control board if
necessary.
• Thermostat fault. • Disconnect thermostat from controller,
turn thermostat to maximum setting,
and check continuity.
No heat when called by thermostat and
stage LEDs are NOT lit.
• Internal control fault. • With thermostat disconnected from
board, voltmeter should read 24V (DC)
across terminals T1 and T2.

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
12
PROBLEM CAUSE SOLUTION / CHECK
• Main fuses blown (if applicable). • Check main fuses and replace if
blown.
• Internal control fault. • Turn stage LEDs on by adjusting
thermostat to maximum setting and
check for 24V (AC) across stages 1, 2,
and 3.
• Anti-Cycle Cube fault With corresponding Stage powered,
place a jumper wire across the Anti-
Cycle Cube terminals. If the main
contactor(s) does not close, perform
main contactor check.
If the main contactor(s) are working,
test for voltage across Anti-Cycle Cube
terminals using AC voltmeter. Voltage
should read 24 V (AC) before the delay
time has elapsed and approximately
2.5 V (AC) after delay time has
elapsed. Replace Anti-Cycle Cube if
necessary.
• Main contactor(s) fault. • Check each contactor coil's terminals
for a supplied voltage of 24V (AC). If
present, main contactor(s) are faulty
and must be replaced. If not present,
wiring continuity fault exists – check
and repair.
No heat when called by thermostat and
stage LEDs are lit.
• Element fault. RISK OF ELECTROCUTION! – MAIN
POWER TO ELEMENTS MUST BE
DISCONNECTED! Next, disconnect
element wires from main contactor(s)
and check for continuity. If no
continuity, replace element. If
continuity, the contactor is defective.
(To confirm contactor defect, check for
continuity across main contactor when
closed.)
Pump runs constantly when there is no
call for heat.
• Internal control fault. • Replace controller.
• Pum
p
ceased or burnt out.
•
Re
p
air or re
p
lace.
• Pump wiring fault. • Check and repair wiring.
• Pump fuse blown. • Check pump fuse and replace if
necessary.
Pump will not run.
• Internal control fault. • Replace controller.
Controller does not operate normally. • Internal control fault. • Replace controller.
• Relief valve not reseating properly. • Quickly lift and release manual
discharge lever on relief valve to assist
proper reseating. If this fails, replace
pressure relief valve.
Pressure relief valve discharges water.
• Pressure reducing valve set too high. • Reduce setting of pressure reducing
valve.
• Element or sensor threads leaking. • Turn off all electricity to the boiler.
Remove wires from element terminals
and tighten elements (with correct
socket wrench). Turn off water, drain,
remove and apply sealant if necessary.
Water leaking from electric boiler.
• Plumbing connections leaking. • Tighten incoming pipes and pressure
relief valve. Turn off water, drain and
remove and apply sealant if necessary.
(Be sure to turn off electricity before
draining or elements will burn out.)

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
13
7.2 SENSOR CHECK
1. SHUT OFF MAIN POWER TO THE ELEMENT HEATING CIRCUIT BEFORE TROUBLESHOOTING!
Also, be careful of 120 Vac power while troubleshooting near Line-in terminals (L1&L2), Pump
terminals (P1&P2) and other areas of the Controller.
2. Control Board should be powered with green "power" LED on. Confirm 120 Vac power at L1&L2
using an AC voltmeter.
3. Confirm correct sensor wiring: red wire to HL, black wire to CL, and white wire to OL.
4. Test hi-limit sensor by using a DC voltmeter to measure voltage across HL&CL and record voltage.
5. Test operator sensor by using a DC voltmeter to measure voltage across OL&CL and record voltage.
6. A sensor at room temperature (68°F) should measure approximately 2.93 Vdc. If the sensor is not at
room temperature use the following formula to calculate the expected voltage reading:
(Sensor Temperature in °F + 459.4 )
DC voltage = 180
The voltage drop across HL&CL and OL&CL should be approximately equal when both sensors are
working properly.
NOTE: A measured voltage of 24 Vdc indicates an open circuit or faulty sensor. Check for loose
connections and wire continuity before replacing sensor.
7. Disconnect sensor from HL, CL, and OL terminals. Confirm 24 Vdc at HL&CL and OL&CL using a DC
voltmeter.
8. If both sensors are operating properly (step 6) and sensor or hi-limit error light is on, replace
controller.

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
14
Replacement Parts Section 8
8.1 ORDERING
Replacement parts or a replacement electric boiler may be purchased through any Allied Engineering
Company distributor – call us if you need help locating a distributor near your area. If you require any
technical assistance or have any comments about our product, please write or phone us at:
Service Department
Allied Engineering Company
94 Riverside Drive
North Vancouver, B.C. CANADA
V7H 2M6
Tel [phone] Fax [phone]
Email: [email protected]
Figure 4 – Replacement Parts

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
15
Notes Section 9

BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
16
Index Section 10
11.0 INDEX
Section...............................................................................................................................................Page
1.0 Dimensions and Specifications
1.1 Technical Specifications .................................................................................................................. 2
1.2 Water Temperature Rise vs Flow Rate............................................................................................ 3
1.3 General Dimensions ........................................................................................................................ 3
2.0 Installation Instructions
2.1 Receiving ......................................................................................................................................... 4
2.2 Introduction ...................................................................................................................................... 4
2.3 Boiler Location ................................................................................................................................. 4
2.4 Wall mounting .................................................................................................................................. 5
2.5 Piping ............................................................................................................................................... 5
3.0 Wiring
3.1 Electrical Wiring ............................................................................................................................... 6
4.0 Startup Instructions
4.1 Warning............................................................................................................................................ 7
4.2 Startup.............................................................................................................................................. 7
5.0 Maintenance Instructions
5.1 Service Hints .................................................................................................................................... 8
6.0 Controller Information
6.1 BiTronic Controller Information ........................................................................................................ 8
6.2 Controller Operation....................................................................................................................... 10
6.3 Temperature Setting ...................................................................................................................... 10
6.4 Anti-Cycle Cube Setting................................................................................................................. 10
6.5 Controller Mounting........................................................................................................................ 10
6.6 Protection from Liquids .................................................................................................................. 10
7.0 Troubleshooting Guide
7.1 Troubleshooting ............................................................................................................................. 11
7.2 Sensor Check................................................................................................................................. 13
8.0 Replacement Parts
8.1 Ordering ......................................................................................................................................... 14
9.0 Notes ............................................................................................................................................. 15
10.0 Index.............................................................................................................................................. 16