24
Rc
Rh
W1
G
Y2
C
O/W2/B
Y1
OAT
RR
S
S
RTN
HUM
D1
D2
V+
Vg
COMMERCIAL THERMO
S
TAT
HUMIDIFIER
a33-9187
Fig. 34 — Thermostat Wiring — Humidifier and Blower Fan
NOTES:
1. D1 and D2 can be used independently for equipment requiring a
dry contact.
2. If humidifier has its own low voltage power supply, do not connect
directly to the thermostat. Use isolated relays.
3. For humidifer control, 24-V is provided from the HUM terminal to
operate the equipment.
4. For fan control, 24-V is applied from Rh to the fan (G) through
relay contacts D1 and D2.
SENSOR 1
SENSOR 2
SENSOR 3
SENSOR 4
COMMERCIAL
THERMOSTAT
RRS
STRN
a33-9279
Fig. 35 — Thermostat Wiring — Space Temperature Sensor Averaging Wiring (4 Sensor Application)
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