Rheem 97MDV060 Series Installation Instructions Manual page 70

HUMIDIFICATION/DEHUMIDIFICATION
A2-2 CONTROLLED HUMIDIFIER OPERATION USING
A HUMIDISTAT (REQUIRES OPTIONAL HUMIDISTAT).
Controlled humidification can be accomplished using a
humidistat as shown in Figures 50 or 51. These figures
show installation of a humidifier with external and internal
power supplies respectively. Dehumidification operation
will be disabled if the dipswitch S2-8 is in the "OFF"
position. If this switch is in the"ON" position,
dehumidification control will be active.
B. DEHUMIDIFICATION CONTROL WITH NO
HUMIDIFICATION
B1. WITH COMMUNICATING THERMOSTAT
For communicating thermostats listed with this furnace,
dehumidification is controlled automatically when selected
at the thermostat and additional wiring is not necessary.
The actual airflow demand (reduced for dehumidification)
is requested of the furnace by the thermostat.
B2. WITH NON-COMMUNICATING THERMOSTAT
(REQUIRES OPTIONAL HUMIDISTAT)
Control of dehumidification only (no humidification)can be
accomplished by installing an optional humidistat as
shown in Figure 50. The dipswitch S2-8 must be set to the
WIRING FOR OPTIONAL HUMIDIFICATION (AND DE-HUMIDIFICATION WITH COMMUNICATING THEMOSTAT) WITH OPTIONAL
FIGURE 49
WIRING FOR OPTIONAL HUMIDIFICATION (AND DE-HUMIDIFICATION WITH COMMUNICATING THERMOSTAT) WITH OPTIONAL HUMIDIFIER AND
NO HUMIDISTAT (HUMIDIFICATION ACTIVE DURING ANY HEAT CALL)
(FOR USE WITH COMMUNICATING OR NON-COMMUNICATING THERMOSTATS)
FIELD INSTALLED JUMPER
FROM "R" TO "HUM STAT"
TERMINALS OPTION:
A. DO NOT INSTALL JUMPER
- THERMOSTAT CONTROLS
HUM/DEHUMIDIFIER.
B. INSTALL JUMPER
- ACTIVATES HUM ON
HEAT CALL. DOES NOT
CONTORL DEHUMIDIFIER.
70
"ON" position. If this switch is not turned "ON",
dehumidification operation will not take place. Further, if
this switch is "ON" and no humidistatis installed, airflow in
cooling will be permanently reduced by approximately
15%.
C. HUMIDIFICATION AND DE-HUMIDIFICATION
CONTROL (REQUIRES OPTIONAL HUMIDIFIER).
C1. WITH COMMUNICATING THERMOSTAT
Humidifier control is included with EcoNet communicating
thermostats. To wire the furnace for humidification and de-
humidification control using an EcoNet communicating
thermostat, refer to the wiring diagram in Figure 49 Option
A. Be sure not to install the jumper between "R" and "HUM
STAT" on the furnace control for thermostat controlled op-
tion. Without the jumper, a humidification call from the
thermostat must be active and a heat call must be present
with the blower running for the "HUM" relay contacts to
close.
Installing this jumper between "R" and "HUMSTAT" as
shown in Figure 49 Option B will operate the humidifier
any time there is a heating call. Dehumidification will never
take place when in cooling. This option can be used for
communicating and noncommunicating thermostats.
HUMIDIFIER AND NO HUMIDISTAT (HUMIDIFICATION ACTIVE DURING ANY HEAT CALL)
(FOR USE WITH COMMUNICATING OR NON-COMMUNICATING THERMOSTATS)
1
2
R
C
HUM STAT
W1
W2
G
Y1
Y2
B
SA1 SA2 OAT1 OAT2
ST-A1194-78-01
S1
S2
L1
HUM HUM EAC
S3
O
NEUTRAL OR COMMON
- +
110V OR 24V
POWER SUPPLY
AS NECESSARY
FOR HUMIDIFIER
HUMIDIFIER WITH
EXTERNAL 110V OR
24V POWER SUPPLY
ST-A1194-78-01