Im trying to replace an old mears m21 sp thermostat controlling the baseboard heater with a new one honeywell rlv3120a to be specific. We are open at 100 capacity during this covid 19 crisis need help selecting.
Nist Nbs Circular 460
Mears m21 sp wiring diagram. This unit has never been used. We are proud to have provided the plumbing and electrical industries with quality products extensive inventory and exceptional customer care since we opened our doors in 1956. Call our experts 8am 5pm est m f at 616 784 1121. The thermostat can be mounted directly on the heater itself or it can be mounted on the wall so that the circuit wiring passes through the thermostat first on the way to. Right now it is on the other side the unswitched side of the 220 v line. All i can find are replacements with 2 wires or 4 wires of black and red but nothing with 3 wires red black and white.
In stock products ordered before 400 pm est ship same day. Mears m21 3 answers. The thermostat measures approximately 4 12 long by 3 14 wide by 2 12 deep. Thermostat location should be four to five feet above floor on an inside wall where thermostat will be subjected to average room temperature. Mears line voltage wall mounted. Of course the two heavy leads blk and red are for the source and the load for one side of the 220 v circuit.
Check location carefully to make sure that it is not near concealed warm or cold air ducts water pipes and drafts from hallways or stairwells. Problem is the old thermostat has 3 wires black red and white all connected to the respective wires in the box. 22 amps at 120 240 volts 18 amps at 277 volts unless otherwise noted degree range 45 75 degrees unless otherwise noted mears thermostat spec sheet. I have m21 sp thermostats through the house here built in 1978. Where should that be connected in this configuration. Unlike the low voltage thermostats that control central heating and air conditioning systems electric baseboard heaters use line voltage thermostats that are installed as part of the full voltage circuit powering the heater.
I have m21 sp thermostats through the house here built in 1978. Chatham brass is a family owned and operated plumbing and electrical manufacturer located in central new jersey. You are buying one mears m21 dp by eaton corp. My house has baseboard heat with thermostats in each room i cannot find the model we have which is mears model m21 sp is there a way to still get these or can you tell me what a good replacement would be. There is also a lighter gauge white wire. 3 m19dp.
Electric heating thermostat double pole with anticipator 22 amp 120240 vac 50 to 90 degree range in the original boxthese thermostats are heavy duty made of cast metal. Of course the two heavy leads blk and red are for the source and the load for one side of the 220 v circuit. Install a switch box in wall.
Gallery of Mears M21 Sp Wiring Diagram
