Electronic Thermostat HONEYWELL TH115-A-240D-B/U | Montreal, Laval, Longueuil, South Shore & North Shore

Some electric heating installations require a double-pole thermostat, that is, a control that acts on both conductors of the 240 V circuit rather than on just one. That's the case when the system design, the electrician's preference or a project's requirements call for it. The Honeywell TH115-A-240D-B/U meets that need while offering the 7-day programming, backlit screen and slim housing of the TH115-A line. You get the comfort and savings of a programmable thermostat, with the type of switching your installation requires.

Double-pole switching with 7-day programming

The TH115-A-240D-B controls electric baseboard heaters, radiant ceilings, convectors and forced-air heaters on 240 V or 208 V circuits. Its maximum load is 15 A resistive, or 3600 W at 240 V or 3120 W at 208 V. That capacity suits most residential rooms, including those with several baseboard heaters. The double-pole relay is epoxy-coated to reduce switching noise, a detail people appreciate in bedrooms.

When to choose double-pole

On a 240 V circuit, each conductor is live. A single-pole thermostat interrupts only one of these conductors, which is enough for normal heating operation. A double-pole thermostat controls both. Our technicians identify the type of control in place and the circuit wiring, then tell you whether the double-pole version is required or simply preferable. It's important to note that even with a double-pole thermostat, the circuit must always be shut off at the panel before any work on the heaters.

All the features of the TH115-A line

Like its siblings, the TH115-A-240D-B offers four periods per day over 7 days, a large backlit LCD screen, a heating power indicator and advanced regulation that reduces temperature swings. The ON/STANDBY switch is used to put it to rest at the end of the season, the time change is automatic and battery-free backup keeps your program during a power outage. It's compatible with Aube RC840 series relays and with the Aube CT240/CT241 telephone controller.

Technical specifications

• Stage: 1 heating, resistive electric heat
• Equipment: electric baseboard heaters, radiant ceilings, convectors or forced-air heaters
• Voltage: 240/208 VAC, 50/60 Hz
• Maximum load: 15 A resistive (3600 W at 240 V, 3120 W at 208 V)
• Double-pole switching; epoxy-coated relay
• 7-day programmable, 4 periods per day
• Large backlit LCD screen; heating power indicator
• ON/STANDBY switch for the end of the season
• Early start; temporary override; concealed programming buttons
• Vacation mode; automatic time change
• Battery-free backup: no reprogramming after an outage
• Setting range: 5 to 30 °C (40 to 86 °F)
• Compatible with Aube RC840 relays and the Aube CT240/CT241 telephone controller
• UL and CSA approvals (CAN/CSA-C828-06); hardwired, no batteries
• Dimensions: 124 x 70 x 23 mm (4.9 x 2.8 x 0.9 in.)
• Colour: white

Professional installation

Connecting a control to line voltage means shutting off the right breaker, checking that there's no current and respecting the thermostat's capacity. That's exactly what our technicians do on every visit. They confirm the circuit voltage, calculate the load of the connected heaters, mount the new base level, then make the connections and the final test. If the wall box is too narrow, damaged or poorly secured, they fix it before closing up. The result is a clean, safe installation ready for winter.

Settings and everyday use

Once the thermostat is installed, it works just like the other TH115-A models. You adjust the temperature with the visible buttons, and programming is done with the buttons hidden under the front cover. We set the time and a first schedule at start-up. Vacation mode keeps the house at a reduced temperature while you're away, and the temporary override gives you a one-time boost of heat without changing the program. In spring, the STANDBY position puts the heating to rest; in fall, the ON position starts it up again with the program intact.

Programming to spend better

The savings from a programmable thermostat don't come from a more efficient heater, but from better use of the one you already have. By lowering the setpoint at night and during predictable absences, you reduce how long the heating runs. In winter, this simple principle makes a visible difference on the bill, with no change in comfort when you're home. We suggest starting with a modest schedule, then adjusting it after a few weeks based on how it feels.

The 240D versus the other TH115-A models

The difference between the TH115-A-240D-B/U and the TH115-A-240S-B/U comes down to the type of switching and the maximum load. The 240S version is single-pole and handles up to 4000 W at 240 V; the 240D version is double-pole and handles up to 3600 W at 240 V. If your circuit exceeds 3600 W, the load will have to be split or another solution chosen. The TH115-A-120S/U, for its part, is meant for 120 V heaters. In a home where both types of switching coexist, our technicians identify each circuit so that every room gets the right version.

Day to day

Once installed, the thermostat fades into the background. Set the setpoint that suits you and let the control do its job; there's no point turning the setting all the way up to heat faster. Keep the front of the control clear and clean. If several rooms have the same model, a consistent setpoint from one room to the next limits the exchange of cold and warm air between zones. After a power outage, simply check the display when the power comes back and adjust if needed.

AirGreen by your side, before and after installation

Replacing a thermostat seems simple, but the wrong model or a sloppy connection is paid for later in discomfort and service calls. AirGreen Inc., a family heating and cooling business founded in Montréal more than 15 years ago, makes sure every control it installs is matched to its heater and its circuit. Under AirGreen's RBQ licence, our technicians work in houses, condos, plexes and commercial spaces in Montréal, Laval, Longueuil, the North Shore and the South Shore. We keep a record of what was installed at your place, which makes any future work simpler, whether it's adding a zone, replacing a unit or reviewing your settings. Our Boucherville showroom also lets you see several controls side by side.

Contact AirGreen for the purchase and professional installation of this thermostat in Montréal, Laval, Longueuil, the North Shore or the South Shore. Describe your current system, or send us a photo of the thermostat in place and its wiring: we'll confirm compatibility and schedule a visit at your convenience.