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BTH Electric Boilers USE & CARE MANUAL 

(Revision June.2014)

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6.

 

manually  maintain  a  minimum  pressure  when 
required.  Another  possibility  is  to  install  a 
pressurized storage tank specially made for those 
applications  that  will  inject  on  request  an 
appropriate  quantity  of  liquid  to  maintain  an 
appropriate pressure on the heating system. 
 

Air bleeder   

Installation  of  manual  or  automatic  air  vents  are 
required to eliminate all air from the boiler and the 
heating distribution system.  
When  the  boiler  is  installed  above  the  heating 
distribution 

system, 

an 

automatic 

air 

separator/eliminator  must  absolutely  be  installed 
at  the  outlet  of  the  boiler  in  order  to  eliminate  all 
possibilities  of  air  buildup  inside  the  boiler  that 
would damage the heating elements. 
 

Circulating pump 

We  recommend  that  the  pump  be  installed  at  the 
outlet  of  the  boiler  with  isolating  valves  as  shown 
in figure 3. 
The pump shall be selected such as to be able to 
supply  adequate  flow  in  relation  to  the  heating 
distribution  system  on  which  it  will  be  connected 
and the heating capacity of the boiler installed. 
The  table  below  will  give  you  details  on  required 
water  flow  for  distribution  systems  having  to 
operate with a differential temperature of 10F and 
20F between their inlet and outlet

Model

Diff. 10F (usgpm) Diff. 20F (usgpm) Boilerpress.drop 

MINI Ultra 6

4.0

2.0

Negligible

MINI Ultra 7.5

5.1

2.5

Negligible

MINI Ultra 9

6.0

3.0

Negligible

MINI Ultra 12

8.2

4.1

Negligible

The boiler has to be activated only upon a call for 
heat and when a pump will be working (no jumper 
allowed on TT terminals) a minimum water flow of 
1usgpm is recommended. 
Your  heating  wholesaler shall  be in good position 
to  recommend  the  appropriate  model  for  your 
application. 
The  amperage  drawn  by  the  pump  and  other 
120volts  components  shall  not  exceed  5  amps  or 
1/6HP. 
 

Drain valve 

Installed  at  the  lowest  point  of  the  unit,  it  allows 
the  unit  to  be  drained  for  the  eventual 
replacement of a defective component. 

 
Strainer 

This  component  is  used  to  collect  potential 
sediments  coming  from  the  distribution  system 
and more particularly from systems made of steel 
piping 

and 

radiators. 

If 

such 

sediments 

accumulate at the bottom of the boiler it could be 
harmful  to  the  heat  transfer  of  the  elements  and 
generate premature failures.  
 

 
ELECTRICAL CONNECTIONS: 

 
Main boiler supply 

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. 
Wiring  must  come  from  a  120/240  Volt  (single 
phase,  60  Hz)  “L1-L2-N”  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. 
The main terminal block of the boiler is suitable for 
#14 to #2 wires. 
Supply  cables  can  be  made  of  Aluminum  or 
Copper and be rated for 90C (194F). 
If  aluminum  cables  are  used,  it  shall  be  of  an 
adequate  size  (generally  bigger)  to  meet  the 
National electrical code. 

 

Electrical supply of External accessories 

The  total  120vac  consumption  of  the  boiler  and 
external accessories must not exceed 5A. 
The  maximum  electrical  consumption  of  24vac 
external  accessories  connected  to  R&C  terminals 
must  not  exceed  30Va.  The  available  voltage  at 
the boiler transformer must not drop below 24Vac. 

 
Outdoor temperature sensor 

If  you  want  the  target  boiler  temperature  to 
modulate  according  to  the  outdoor  temperature  ( 
when the outdoor  temp.  will  get colder, the target 
temp.  will  get  higher)  ,  the  supplied  outdoor 
sensor will have to be connected to S1 S1 before 
turning the power on to the unit.  
The installation of this sensor avoids the operation 
of  the  boiler  when  the  outdoor  temperature 
exceeds  the  selected  value  corresponding  to  the 
maximum temperature required for heating. 
The sensor shall be connected to terminals S1-S1 
in the boiler using a two conductor cable 18ga. 

 

Summary of Contents for MINI Ultra 12

Page 1: ...tion 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 envel...

Page 2: ...e Max 5amp 1 6hp of the circulating pump if it is connected directly to the boiler A higher capacity cable an breaker could be required In all cases the local Electrical Code has priority Can be connected to a 208Vac 1ph electrical supply The resulting capacity will be of 75 of the nominal capacity at 240V and the amperage will be of 87 Dimensions Connections Overall dimensions Inlet heating retur...

Page 3: ... 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 All installations have a maximum design operating pressure limited to 30 psi 207kPa by a safety relief valve Boiler operating temperature ra...

Page 4: ...age 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 The boiler can be mounted directly on a wall with adeq...

Page 5: ...ocation in case of discharge The piping diameter used for the discharge piping shall not be smaller than that of the valve outlet 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 Expansion tank The expansion tank must be able to store the required volume of boiler water during maximum design op...

Page 6: ...t allows the unit to be drained for the eventual replacement of a defective component Strainer This component is used to collect potential sediments coming from the distribution system and more particularly from systems made of steel piping and radiators If such sediments accumulate at the bottom of the boiler it could be harmful to the heat transfer of the elements and generate premature failures...

Page 7: ...ceed 5A 1 6HP Multiple pumps zoning applications Components shall be connected in such a way that when a thermostat is calling for heat only the corresponding pump be operated and an auxiliary contact X X closes to give the signal of the heat demand to the boiler otherwise the elements will not be working To do so you will need relays as illustrated below Boiler terminals PP will not be used N B D...

Page 8: ...BTH Electric Boilers USE CARE MANUAL Revision June 2014 Page 8 ...

Page 9: ... The electronic control uses an LCD display to make all adjustments and to visualize the operation of the system OPERATION OF THE INTERFACE The controller uses four push buttons at the bottom of the display to select and adjust the parameters The button is used to access to the configuration menu and confirm a selection The buttons are used to select an item or adjust a value The button enables th...

Page 10: ...alculated by the controller in relation to the parameters selected in the menu and the maximum target temperature required when the outdoor temperature will get to 10F 23C The STD curve corresponds to the default maximum temperature for a typical system and this value can be modified from the MIN to MAX value shown on the following tables The following tables show the values of the target temperat...

Page 11: ...pplies heat to a lodger Systems connected to a geothermic heat pump where we do not want the electric boiler to be operating unless the outdoor temperature drops to a selected degree CONFIGURATION OF THE CONTROLLER Since each type of heating distribution system is designed to operate at water temperatures that are particular to its operation the proper configuration of the operating parameters of ...

Page 12: ... period that the pump will be running once the heat demand is completed Select OFF if the heat system is equipped with electric zone valves OFF 15 sec to 60min ON 30sec Select the outdoor temperature at which no heating of the building is required the outdoor sensor has to be installed 0F à 105F 75F Note1 Once these parameters have been set the controller will automatically return to its normal vi...

Page 13: ...TURE The controller will engage the Boost program when the heat demand on terminals W R has been maintained for a pre determined period according to the type of selected application Once this period has been reached the Boost icon will appear on the display and the boiler target temperature will start increasing very slowly over a pre determined period and up to a pre calculated maximum value unti...

Page 14: ...erminals of the boiler it can be activated by selecting ON in the configuration menu after having pressed for 2 seconds Adjust the UltraSmart boiler temperature controller as explained earlier and set the purge delay of the pump from On to its normal operation setting Set the room thermostat ON to generate a heat demand The pump shall start The heating elements shall gradually come on and the boil...

Page 15: ...outlet of this valve if a dripping condition occurs Twice a year Check for the proper operation of the automatic air purger s and eliminate air from the radiators Annually It is recommended that a visual inspection be made on the electrical compartments of the boiler to check the water tightness of the gasket on the element flange and also check for any signs of overheating of the components and w...

Page 16: ... the unit is not in short or open circuit Do not install a jumper between S1 S1 when the sensor is not required Check the resistance value ohms of the sensor It should correspond to the value shown on the table below otherwise it should be replaced Check for proper connection of the wires inside the boiler connected to S1S1 and at the controller terminals The display shows Er2 and blinks The contr...

Page 17: ...ipator If available to obtain longer operating cycles Replace defective elements If a boiler water temperature higher is required to satisfy the heat demands of the thermostats a boiler having a larger capacity is required Boiler stays in demand even when the thermostat is not in demand Systems with more than one thermostat On systems with electric zone valves one or many end switches included in ...

Page 18: ...rranty is void and shall not apply if 1 Defects or malfunctions resulting from installation repair maintenance and or usage that are not done in conformity with the manufacturer s installation manual or 2 Defects or malfunctions resulting from installation maintenance or repair that are not done in accordance with regulations in force or 3 Defects or malfunctions resulting from improper installati...

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