selection rules and self-assembly

The end result of installing an autonomous heat­ing sys­tem is to obtain max­i­mum ther­mal com­fort for peo­ple liv­ing in the house. In addi­tion to choos­ing a boil­er, the future own­er must take care of pur­chas­ing a min­i­mum set of automa­tion, which includes a room ther­mo­stat for a heat­ing boil­er. What kind of device it is, what is its role in cre­at­ing a com­fort­able micro­cli­mate in the room, will be described in this pub­li­ca­tion.


Why an air thermostat for a heating boiler?

All hap­py own­ers of autonomous heat­ing know that a boil­er is a device that, by burn­ing fuel, heats the water cir­cu­lat­ing in the heat­ing sys­tem. The heat­ing boil­er does not work con­stant­ly, but cycli­cal­ly: it heat­ed the coolant to a cer­tain tem­per­a­ture — it turned off. The coolant cooled down by a few degrees — the boil­er turned on. The tem­per­a­ture of the heat car­ri­er is set man­u­al­ly by the own­er, with a ther­mo­stat, which is an inte­gral part of any mod­ern heat­ing boil­er, regard­less of its man­u­fac­tur­er and equip­ment func­tion­al­i­ty.

This sys­tem of ther­moreg­u­la­tion has sev­er­al rather seri­ous draw­backs:

  1. The first incon­ve­nience is that when the weath­er changes, the own­er of the autonomous heat­ing sys­tem is forced to vis­it the fur­nace room every time and set new tem­per­a­ture val­ues ​​u200bu200bon the boil­er. This is not always con­ve­nient, espe­cial­ly if the boil­er is installed in a sep­a­rate fur­nace room.
  2. In order to main­tain the tem­per­a­ture set by the user, the boil­er often turns on and off the burn­er. This leads to an increase in fuel con­sump­tion and the devel­op­ment of equip­ment life.

To solve these prob­lems, most man­u­fac­tur­ers of cli­mate tech­nol­o­gy rec­om­mend using room ther­mostats for a gas boil­er. Some­times on the net­work you can find the names of this device as: air ther­mo­stat, pro­gram­mer or room tem­per­a­ture sen­sors.

The principle of operation of the thermostat

The sim­plest room ther­mo­stat is an electro­mechan­i­cal device, the “heart” of which is a tem­per­a­ture-sen­si­tive ele­ment filled with gas that expands with increas­ing air tem­per­a­ture. Upon reach­ing the user-defined air tem­per­a­ture in the room where the device is installed, the tem­per­a­ture-sen­si­tive ele­ment opens the con­tacts that con­nect the device with the heat­ing boil­er. This action is a sig­nal for the boil­er automa­tion or for the gas valve, which turn off the burn­er or put it into sup­port mode. It all depends on the mod­el and con­fig­u­ra­tion of the heat­ing equip­ment.Thermostat Fantini Cosmi C16

When the boil­er stops, the coolant in the cir­cuit cools down. Nat­u­ral­ly, this leads to a decrease in the air tem­per­a­ture in the room, while the ther­mo­cou­ple clos­es the con­tacts, and the heat­ing sys­tem con­troller restarts the burn­er.

The advan­tages of using a room ther­mo­stat are as fol­lows: com­fort in a heat­ed room depends on the tem­per­a­ture and humid­i­ty char­ac­ter­is­tics of the air, and not on the tem­per­a­ture of the coolant in the bat­ter­ies. Air cools much more slow­ly than water. That is why when using a room ther­mo­stat, the most com­fort­able tem­per­a­ture for the inhab­i­tants of the room is main­tained with a sig­nif­i­cant reduc­tion in the num­ber of start-ups of the heat­ing boil­er.

In oth­er words: using an air ther­mo­stat, you increase the life of the equip­ment and get a com­fort­able micro­cli­mate in your home, get­ting rid of the fre­quent adjust­ment of the para­me­ters of the boil­er, sav­ing mon­ey on the return of used fuel. Numer­ous obser­va­tions show that when using a room tem­per­a­ture sen­sor, the cost sav­ings for the main­te­nance of an autonomous heat­ing sys­tem is up to 35% per year.

Types of room thermostats

All types of air ther­mostats can be divid­ed into two broad cat­e­gories:

  1. Devices that use a cable to com­mu­ni­cate with the heat­ing sys­tem.
  2. Wire­less tem­per­a­ture con­trollers, in which a radio chan­nel is used to com­mu­ni­cate with the boil­er.

Wired devices are con­di­tion­al­ly divid­ed into mechan­i­cal and elec­tron­ic. In mechan­i­cal sys­tems, a tem­per­a­ture-sen­si­tive ele­ment is respon­si­ble for con­trol­ling the oper­a­tion of the boil­er plant, an exam­ple of which was dis­cussed above. In the elec­tron­ic ther­mo­stat for the boil­er, the tem­per­a­ture sen­sor is respon­si­ble for con­trol­ling the lat­ter.

Wire­less devices con­sist of two mod­ules: the first is installed direct­ly next to the boil­er unit and is con­nect­ed by cable to its ter­mi­nals. The sec­ond mod­ule is mount­ed in a heat­ed room. It has an infor­ma­tive LCD dis­play and a numer­ic key­pad for set­ting para­me­ters. Between them­selves, the con­troller and the exec­u­tive mod­ule com­mu­ni­cate via a radio chan­nel, the fre­quen­cy of which does not affect the oper­a­tion of oth­er elec­tron­ic equip­ment in the house.Wireless thermostat

The wire­less group of ther­mostats can be divid­ed into sim­ple devices, the work of which is only to turn off and turn on the heat­ing equip­ment when peak tem­per­a­tures are reached, and week­ly pro­gram­mers, which we will dwell on in more detail.

The week­ly pro­gram­mer is a mod­ern mul­ti­func­tion­al device that can not only mon­i­tor the main­te­nance of a fixed tem­per­a­ture, but also has the pos­si­bil­i­ty of hourly and week­ly pro­gram­ming of the ther­mal regime. Most mod­els of pro­gram­mers are non-volatile and can work with built-in recharge­able bat­ter­ies.

Today, gsm ther­mostats for heat­ing boil­ers have appeared on the domes­tic mar­ket of cli­mate tech­nol­o­gy. One or two SIM cards are installed in these devices, thanks to which the own­er of the autonomous heat­ing sys­tem has the oppor­tu­ni­ty to con­trol the oper­a­tion of the boil­er remote­ly using a smart­phone or tablet PC.

Depart­ing from the top­ic, we want to inform you that we have pre­pared com­par­a­tive reviews on gas boil­ers. You can get acquaint­ed with them in the fol­low­ing mate­ri­als:

Do-it-yourself thermostat installation

Although by law all work with gas equip­ment must be car­ried out by cer­ti­fied spe­cial­ists, any home crafts­man who has the skills to work with a screw­driv­er can install a room ther­mo­stat on his own. Con­sid­er the stages of work on the exam­ple of a wall-mount­ed gas boil­er.

  1. Pow­er off the device.
  2. Remove the out­er cov­er from the heat­ing sys­tem. As a rule, it is dis­man­tled by unscrew­ing 4 screws fixed from the bot­tom of the device.
  3. Loosen the screws secur­ing the con­trol box.
  4. Remove the cov­er from the con­trol box. The task is to get to the con­trol board.
  5. On the board you will see a jumper between the “TA” con­tacts, which must be dis­man­tled.
  6. Instead of a jumper, con­nect a two-core insu­lat­ed cable (prefer­ably cop­per) with a con­duc­tor cross sec­tion of 0.5 — 0.75 mm2.

The volt­age that comes out of the con­trol board to the ther­mo­stat con­nec­tion cable is non-haz­ardous, 24 V. But, when work­ing with elec­tric­i­ty, fol­low all safe­ty rules!

  1. Assem­ble the con­trol box and install the boil­er cov­er in reverse order.
  2. Con­nect the ther­mo­stat to the cable accord­ing to the instruc­tions for the device.

Advice! If you are con­nect­ing a room ther­mo­stat that has more than 2 pins on the ter­mi­nal block, use the ones that indi­cate a nor­mal­ly open con­tact. (H, NO). In devices from the Celes­tial Empire, con­tacts can be indi­cat­ed by the num­bers 1; 2; 3. You can deter­mine the nor­mal­ly open con­tact using a tester.

Video on con­nect­ing the ther­mo­stat to the heat­ing boil­er:

Selection Tips

How to choose the right model

  1. If you are on a bud­get, then get a sim­ple, wired, elec­tron­ic ther­mo­stat. Such devices are more tech­no­log­i­cal­ly advanced, with a bet­ter response, and the qual­i­ty of their work does not depend on con­tacts oxi­dized in air, as in mechan­i­cal coun­ter­parts.
  2. If you are con­cerned about sav­ing ener­gy resources, and at the same time your own funds, pur­chase a week­ly pro­gram­mer. This device will sig­nif­i­cant­ly reduce the tem­per­a­ture in the room, and, accord­ing­ly, the fre­quen­cy of switch­ing on the boil­er plant dur­ing the hours when all house­hold mem­bers are at work.
  3. If you have already made repairs, and there is no desire to ditch the walls for cable lay­ing, then pur­chase wire­less air ther­mostats.

In prin­ci­ple, any room ther­mo­stat is like any wall-mount­ed gas boil­er. How­ev­er, boil­er man­u­fac­tur­ers strong­ly rec­om­mend con­nect­ing only one brand of air ther­mostats. For exam­ple, accord­ing to the man­u­fac­tur­er, a room ther­mo­stat for a baxi gas boil­er should only be of this brand. This is a mar­ket­ing ploy to attract more cus­tomers!


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