1514
USING FURNACE ACCESSORY TERMINALS TO DETECT
FURNACE OR BLOWER OPERATION (FIGURE K)
S th furnac manual for voltag and op ration of th
acc ssory t rminals. If acc ssory t rminals ar 120 Volts, install
a 24 VAC transform r.
“HUM” for op rating humidifi r during h at call.
“EAC” for op rating humidifi r wh n HVAC blow r is on.
or
“EAC” for op rating humidifi r with continuous fan s tting
on th rmostat.
NOTE: Plumb humidifi r to hot wat r wh n using “EAC” t rminals.
Figur K
90-1221
STEP 11: Pow r Sourc for Humidifi r Control –
T rminals R and C
Wir xt rnal 24 VAC transform r into a constant pow r sourc
oth r than th h ating, v ntilating, air conditioning quipm nt
(HVAC) blow r circuit. Th transform r can b pow r d off th
120 VAC lin at th junction box b for it nt rs th HVAC.
Conn ct th 24 volt sid of th transform r to th “R” and “C”
t rminals on th Humidifi r Control.
NOTES:
• Th Humidifi r Control must b continuously pow r d for
prop r functionality.
• Th minimum VA r quir d is:
2.0 VA for humidifi r Mod ls 110, 112, 445, 448, 700 (almond
color d humidifi r only), 760, and 768.
10.0 VA for humidifi r Mod ls 220, 224, 400 S ri s, 440,
500 S ri s, 550, 558, 600 S ri s, and 700 S ri s (gray color d
humidifi rs only).
STEP 12: Humidifi r Wiring – S Figur s K through Q
Strip th wir s us d for all Humidifi r Control t rminal
conn ctions 1/4 inch.
NOTES:
• In ord r for th humidifi r to op rat , th HVAC blow r must
b running and th Humidifi r Control must b calling for
humidity.
• Th r ar s v ral ways to d t ct HVAC blow r op ration.
S th wiring diagrams for options.
