57
F
AN
M
ODE
C
ONVENTIONAL
T
HERMOSTAT
Two seconds after G request becomes active without Y1 re-
quest, IFC will run the circulator at the appropriate speed (as
selected by the DIP switches), unless circulator is running
as a result of Heat or Cool mode. The circulator speed re-
quired by the heat or cool demand always has priority over G
speed.
C
OMMUNICATING
T
HERMOSTAT
If a conventional G request is present without a heat or cool
request from the communicating thermostat, the circulator
will run at the selected fan speed.
H
UMIDITY
C
ONTROL
H
UMIDIFIER
O
UTPUT
– C
ONVENTIONAL
T
HERMOSTAT
One set of isolated relay contacts are wired to a pair of termi-
nals for connection to a humidifier. When the inducer is on
the IFC closes the humidifier relay contacts, except from the
calibration routine where the humidifier relay contacts are
always open.
H
UMIDIFIER
O
UTPUT
– C
OMMUNICATING
T
HERMOSTAT
One set of isolated relay contacts are wired to a pair of termi-
nals for connection to a humidifier. Upon receipt of a Humidi-
fication Requested Demand the IFC will:
•
Close the humidifier relay contacts
•
Energize the circulator at the circulation speed (G
speed) unless the circulator is commanded to a differ-
ent speed by a heat demand.
Dehumidification – Conventional Thermostat
•
DEHUM functionality is enabled by a DIP switch set-
ting.
•
The IFC varies circulator speed operation based on the
DEHUM signal from the thermostat
•
If 24VAC (R) is not connected to DEHUM (through a
Humidistat) and both Y1 and O terminals are ener-
gized, then the IFC control reduces the cooling CFM
by 15%.
•
If both Y1 and O terminals are not energized, the
DEHUM signal is ignored
•
DEHUM is ignored during any heating request.
L
EARN
P
USH
-B
UTTON
Pressing the learn button re-sets the communicating net-
work and allows the IFC to search for communicating equip-
ment The press and release of the button starts the same
learning process as during power-up of the system.
C
LIMATE
T
ALK
™ C
OMMUNICATION
LED
S
The IFC has two LEDs :
•
Red communications LED – Indicates the status of
the network
•
OFF is normal condition.
•
2 slow flashes on power-up: ON for ¼ second, OFF for
¾ second, ON for ¼ second, OFF.
•
Continuous slow flash indicates communication fail-
ure: ON for ¼ second, OFF for ¾ second…
•
Green receive LED – Indicates network traffic
•
Fast, sporadic flashes indicates normal bus commu-
nication.
•
ON solid indicates a Data 1 / Data 2 miswire.
Model
Tap
Low
Stage
Cool
High
Stage
Cool
10 0%
Heat
*CFM
A
370
660
1220
B
540
860
1340
C
790
1 150
1460
D
980
1 470
1590
A
530
900
1600
B
730
1 100
1710
C
930
1 430
1800
D
1220
1 880
1910
A
500
780
1730
B
740
1 070
1770
C
920
1 380
1840
D
1160
1 780
1870
A
390
630
9 50
B
550
800
1050
C
680
1 000
1170
D
800
1 210
1270
A
540
830
1600
B
750
1 090
1690
C
980
1 460
1800
D
1210
1 800
1890
A
510
790
1810
B
710
1 100
1850
C
910
1 410
1890
D
1160
1 830
1940
A
510
790
1810
B
710
1 100
1850
C
910
1 410
1890
D
1160
1 830
1940
*MVM961155DX*
*100% CF M shown. CFM will vary proportionally with the gas valve
BTU/H input.
*CVM960805DX*
*CVM960604CX*
*MVM961005DX*
*MVM960805CX*
*MVM960603BX*
*CVM961005DX*
Airflow Table
OPERATION
