HOT WATER THERMOSTAT WIRING DIAGRAMS

Guide to wiring connections for room thermostats
At left the thermostat wiring diagram illustrates use of a Honeywell T87F thermostat in a 2-wire application controlling a gas fired heating appliance. In the Honeywell T87F thermostat series the single pole double throw switch makes (closes) one set of contacts when the temperature falls - to turn on the heating appliance.[PDF]
Learning Thermostat Installation Guide - Nest
5 Hot water relay common 3 A resistive, 1 A inductive 6 Hot water relay normally open/call for heat 3 A resistive, 1 A inductive OT1 OpenTherm wire 1 42 V DC max. OT2 OpenTherm wire 2 42 V DC max. If using T1 and T2, connect to earth T1 12 V DC power output to Nest T2 12 V DC power output to Nest Note: T1 and T2 have no polarity at the thermostat.
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