AHRI (-)98VA060M317USA, Installation Instructions Manual

Page: 67 / 108

67
START-UP AND SEqUENCE OF OPERATIONS
STAT”. A separate humidistat is not required for this
configuration and the humidifier will turn on whenever
there is a call for heat and the blower is running.
A2-2 CONTROLLED HUMIDIFIER OPERATION USING
A HUMIDISTAT (REqUIRES OPTIONAL HUMIDISTAT).
Controlled humidification can be accomplished using a
humidistat as shown in Figures 49 or 50. 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
“ON” position. If this switch is not turned “ON”,
dehumidification operation will not take place. Further, if
this switch is “ON” and no humidistat is 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.
HUMIDIFICATION/DEHUMIDIFICATION
Int
eg
rat
ed
Fu
rn
ace
Co
ntr
ol
HUMIDISTAT (24V)
(CONTACTS OPEN
WHEN HUMIDITY
IS ABOVE SET POINT)
ST-A1194-79-00
SWITCH #S2-8 MUST BE IN “ON” POSITION
(NOTE: FACTORY POSITION IS ”OFF”).
TURNING THIS SWITCH “OFF” WILL DISABLE
DEHUMIDIFICATION OPERATION WITH A
NON-COMMUNICATING THERMOSTAT
NEUTRAL OR COMMON
HUMIDIFIER WITH
EXTERNAL 110V 04
24V POWER SUPPLY
SPST RELAY WITH
N.O. CONTACTS
RATED 24V OR 110V
CONTACTS AS NECESSARY
FOR HUMIDIFIER
SA1 SA2 OAT1 OAT2
S1
S2
S3
HUM HUM EAC
L1
N
E
U
T
R
A
L
1
2
R
C
HUM STAT
W1
W2
G
Y1
Y2
B
110V OR 24V
POWER SUPPLY
AS NECESSARY
FOR HUMIDIFIER
- +
FIGURE 50
WIRING FOR OPTIONAL DE-HUMIDIFICATION AND HUMIDIFICATION (WITH OPTIONAL HUMIDISTAT AND HUMIDIFIER).
NOTE: CAN BE USED WITH COMMUNICATING OR NON-COMMUNICATING SySTEMS.
ST-A1194-79-00
NEUTRAL OR
COMMON
HUMIDISTAT
(24V)
(CONTACTS
OPEN
WHEN
HUMIDITY IS
ABOVE SET
POINT)
HUMIDIFIER WITH
EXTERNAL 110V OR
24V POWER SUPPLY
SWITCH #S2-8 MUST BE IN “ON”
POSITION (NOTE: FACTORY
POSITION IS “OFF”). TURNING THIS
SWITCH “OFF” WILL DISABLE
DEHUMIDIFICATION OPERATION
WITH A NON-COMMUNICATING
THERMOSTAT
SPST RELAY WITH N.O.
CONTACTS RATED 24V OR
110V CONTACTS AS NECES-
SARY FOR HUMIDIFIER
110 OR 24V POWER
SUPPLY AS NECES-
SARY FOR HUMIDIFIER