Honeywell ERM5220R Install Manual page 8

COMPRESSOR
BOILER
IMPORTANT
If the ERM was previously used with a compressor and will now
be used with a boiler:
1) un-enroll the ERM at the thermostat;
2) remove the jumper on the ERM;
3) designate Radiant Heat for Heating System Type
(ISU 2000) in your thermostat.
33-00135EFS—07
Y2
Y
J R C
T
24
VAC
V c.a.
R C Y Y2 O/B
EQUIPMENT CONTROL BOARD
Y
R C
J
24
VAC
V c.a.
EQUIPMENT
CONTROL
O/B
D L S1 S1
T
10K OHM OUTDOOR
TEMPERATURE
SENSOR (OPTIONAL)
D L
Fig. 7.
Y2 O/B
D L S1 S1
T T
T T
10K OHM INDOOR
TEMPERATURE
SENSOR
(RECOMMENDED)
BOARD
Fig. 8.
M35668
M35673
8