UPM HTM621, Manual

Page: 9 / 30

7
INSTALLATION
Mount the thermostat to the wall box using two screws
through the mounting holes, and then replace the
faceplate. (Place screws in the 2 right or 2 left holes.)
Using the wire nuts provided, securely fasten each
wire from the new thermostat to the live wires in the
wall box. Refer to the diagram.
NOTE: ENSURE THAT NO BARE WIRE IS EXPOSED.
Remove the old thermostat carefully, and identify the
two wires from the wall box.
Reconnect power supply.
1
2
3
4
4-WIRE INSTALLATION:
Metal Wall Box
Electric
Heater
25.8
23.0
8:15
PM
*120 V / 240 V AC Lines
Wire Nut Wire Nut
Wire Nut
Bypass
Connect
Gently remove the faceplate from the right side of the
new thermostat, but DO NOT remove the screws
from the back of the unit, because these screws hold
the thermostat together.
5
* Remove Faceplate
To remove the
faceplate, gently
pull the right side of
the thermostat.
The faceplate should
come off easily.
*Note: If there are 4 wires connected to the old thermostat,
the 2 extra wires should be connected together using a wire
nut (not supplied).
HOLD USAGE PROG
COPY DAY SET
RESET