57
FAN MODE
CONVENTIONAL 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.
COMMUNICATING 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.
HUMIDITY C ONTROL
HUMIDIFIER OUTPUT – CONVENTIONAL 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.
HUMIDIFIER OUTPUT – COMMUNICATING THERMOSTAT
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.
LEARN P USH-BUTTON
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.
CLIMATETALK™ COMMUNICATION LEDS
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
100%
Heat
*CFM
A 370 660 1220
B 540 860 1340
C 790 1150 1460
D 980 1470 1590
A 530 900 1600
B 730 1100 1710
C 930 1430 1800
D 1220 1880 1910
A 500 780 1730
B 740 1070 1770
C 920 1380 1840
D 1160 1780 1870
A 390 630 950
B 550 800 1050
C 680 1000 1170
D 800 1210 1270
A 540 830 1600
B 750 1090 1690
C 980 1460 1800
D 1210 1800 1890
A 510 790 1810
B 710 1100 1850
C 910 1410 1890
D 1160 1830 1940
A 510 790 1810
B 710 1100 1850
C 910 1410 1890
D 1160 1830 1940
*MVM961155DX*
*100% CFM shown. CFM will vary proportionally with the gas valve
BTU/H input.
*CVM960805DX*
*CVM960604CX*
*MVM961005DX*
*MVM960805CX*
*MVM960603BX*
*CVM961005DX*
Airflow Table
OPERATION
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