Humidity And Sensors; Typical Wiring For Dehumidifier System; Typical Wiring For 120V Humidifier System; Typical Wiring For 24V Humidifier System - White Rodgers 1F95-1291 Install And Operation Instructions

WIRING DIAGRAMS
Dehumidifi cation wiring without an electronically controlled variable speed blower system for
single stage compressor system only.
If you have a single stage compressor system see the dia-
gram below. A relay (customer provided) should be installed
as shown in Fig 7 to switch the fan speed to the next lower
speed on a call for dehumidifi cation from the thermostat. The
reduction in air fl ow allows the coil to remove more humidity
from the air. The relay should be rated for blower motor load.
Since this confi guration reduces the air fl ow in cooling, the
Figure 5 – Typical Wiring for Dehumidifi er System
DHM
Relay
90-293Q
or equivalent
N
"Cool Fan Output"
1 Normal Cool speed position (DHM energized)
2 Dehum speed mode (DHM de-energized)
Figure 7 – Typical Wiring for 24V Humidifi er System
HM
Humidifier
System
Figure 4 – Humidity and Sensors
HM DHM
De-energizes on call for
Humidification Terminal,
Dehumidification to
Energizes on call for
lower the fan speed.
heat if Humidity setpoint
The DHM terminal is
is above room humidity.
only used on systems
Can also be used to
with a compatible
provide humidification
dehumidification feature
independent of a call for
that have the required
heat and/or in cooling
terminal connection on
mode if Automatic
the contol module or
Humidification is
have a relay installed to
selected in Configura-
lower the fan speed
tion Menu item #34
No
1
2
Dehum
NC
Speed Fan
Figure 6 – Typical Wiring for 120V Humidifi er System
HM
Relay
90-290Q
or equivalent
Humidifier
NEUTRAL
System
24 VAC
+
Supply voltage
Remote
to remote
temperature
temperature
sensor signal
sensor
anti-freeze-up control (White-Rodgers CAFC) or equivalent is
recommended. The CAFC prevents the air conditioning coil
from freezing due to low air fl ow, dirty fi lters, low refrigerant
pressure, etc. The CAFC snaps onto the suction line close to
the evaporator coil as possible and breaks the compressor
circuit when the suction line drops below 38 °F and re-make
the circuit at 46°F.
Normal High
Med
Low
"Heat Fan Output"
N
HOT
120 VAC
R
HOT
NEUTRAL
TRANSFORMER
-
S
Supply voltage
to remote
temperature
sensor
R
24 VAC
NEUTRAL
TRANSFORMER
120 VAC
HOT
120 VAC
4