I want to put in a new thermostat but I do not know how to connect the Rh wire with jumper to Rc wire to new thermostat! it only has labels for O/B Y R G W . no hook up for the Rc OR Rh

Paulette, if your new thermostat has no Rc and Rh thats fine. The Red wire should simply go to the R terminal. The Rc and Rh terminals on the old one was for the old 'two transformer' systems. The vast majority of systems now have no need for the Rc Rh terminal and jumper. The rest of your wires connect as on the old stat also.

A thermostat is a switch. It connects 24vac from one terminal to another depending on the request. The 24vac comes from a transformer, usually located in the furnace and connects to the R terminal. Since you are using RH and RC without a jumper between it means there are two transformers, one in the furnace for heating (RH) and one in the air conditioner condenser used for cooling (RC).
Your old thermostat was probably mechanical and did not have a C (24vac common) terminal. Your new thermostat requires power to operate therefore needs a wire connected to a C terminal. I would get rid of the transformer you added and look for an unused wire in the bunch at the thermostat. If it's there connect it to C on the thermostat and to C on the furnace. Remove any jumper from R to RC or from RH to RC depending on your thermostat and connect wires same as the old thermostat.

No. cap the c and don't use. R goes to rc. Your new tstat requires batteries and the old did not.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Use the RH & W terminals. You cannot connect it backwards so it's a breeze.

I think there is connection labeled Rh. The reason for having Rc and Rh is that some units have a transformer for the heating unit and seperate on for the cooling unit. If you only have 1 transformer then they have a jumper between Rc & Rh. Rh being for heating and Rc for cooling. Hope this helps. Let me know what you find.

If you have this type of system your thermostat will not work;

Multi-Stage Heat Pumps

3 Wire Hydronic Systems

Line Voltage Systems (120/240 VAC)

This thermostat is only for this type of HVAC systems;

Most 24V Heating and A/C Systems

1 Stage Heat/1 Stage Cool: Gas, Oil, Electric, or Single Stage Heat Pump Systems

2 Wire Heat Only Hydronic Systems (Hot Water Baseboard & Radiator)

Millivolt Systems (Wall Heaters / Furnaces & Gas Fireplaces)

1. Never connect a low voltage thermostat to line voltage.

Two wires control a heat only system.

1. Connect one wire to W and the other to RH.

Two wires control a cool only system.

1. Connect one wire to RC and the other to Y.

Three wires for forced air heat only system, where the previous thermostat
did not have a clock or timer.

1. The previous RH or RC wire is the 24-volt transformer wire. Connect it to RH. Leave jumper connecting RH to RC. Connect the forced air heat system to W, and the fan wire to G.

Three wires for a heat only, forced
water system that did NOT have a
clock or timer.

1. This system employ 3 wire zone valves. Currently no Lux controls are compatible with this system.

Three wires control a heat only, forced water system that DID have a clock or timer.

1. Tape off and do NOT install any clock or timer wire. Often they are labeled C or TC. Install the remaining two wires, one to RH and the other to W.

Four wires control a heat only system,
and two of the wires operate clock or timer. The other two wires operate the heater.

1. Tape off and do NOT install any clock or timer wire. Often they are labeled C or TC. Install the remaining two wires, one to RH and the other to W. The jumper connecting RH to RC may remain or be removed.

Two wires control heating AND cooling.

1. Currently no Lux controls are compatible with this system.

Three wires control heating and cooling. One wire operates heat, one operates cooling and the third provides 24 VAC.

1. Connect the 24-volt power wire to RH. Install a jumper connecting RH to RC. This jumper is usually pre-wired. connect the heat wire to W, and the cooling wire to Y.

Three wires control a cooling only system. One wire operates the compressor, one operates the fan and the third provides
24 VAC.

1. Connect the 24-volt power wire to RC. Connect the cooling wire to Y and the fan wire to G.

Four wires control a heating and cooling, electric, gas or oil, forced air system that
is NOT a heat pump.

1. Connect the 24 VAC transformer wire to RH or RC. Install a jumper connecting RH to RC This jumper is often prewired. Connect the heat wire to W, the cooling wire to Y. and the fan wire to G.

Four wires control a Single Stage Heat Pump. They were labeled: G, Y, R or
RH or RC, With either B or was used.

1. Do not connect wires to both B and O. Connect the reversing valve wire to B or O, just as the previous thermostat. Install a jumper wire from RH to RC. Connect 24 VAC wire to RH too. Install a second jumper wire from W to Y. Connect compressor wire to Y and the fan wire to G.

More than 4 wires are connected to the
old thermostat

No keep the jumper, you should be able to get the red wire in under the little peice of mettal that the jumper is under but just on the other side of the screw, The red wire can go on either the Rh or the Rc terminal along with the jumper. If all else fails just put a wire under Rh and another wire under Rc and then wire nut the red Rh and Rc wires all together.

you have to go down to your furnace and follow the thermostat wire ...it connects to a terminal strip or fan centre...the color doesn;t really matter...installers mix and match all the time....look at the furnace wiring and mark it down...Red on "R"...Green on "Y" whatever it is...and connect it accordingly upstairs...if you only have 4 thermostat wires downstairs you will need a jumper wire between RH and RC...if you have 5 wires you will see 2 wires on "R" at the furnace.,...and connect either to RH and RC at the thermostat

rh is power for cooling terminal and rh is power for heating terminal connect red wire to rc or rh and there should be a jumper between rc and rh if not install one all other wires are color coded correctly. now the blue wire is not used.

put the jumper back in RC and RH and that should do it.