Service Manual

43
Model Tap
Low
Stage
Cool
High Stage
Cool
100%
Heat
*CFM
Low heat
CFM for
2 stage
A
398 599 953 667
B
557 817 1059 740
C
696 1007 1158 808
D
810 1212 1260 881
A
403 629 1202 855
B
540 806 1316 923
C
705 1023 1389 1033
D
819 1230 1396 1063
A
513 789 1228 867
B
660 967 1337 939
C
791 1182 1430 1016
D
913 1375 1516 1077
A
564 820 1818 1256
B
784 1133 1870 1292
C
982 1464 1910 1316
D
1259 1736 1957 1358
A
547 867 1891 1329
B
831 1160 1940 1362
C
1020 1467 1968 1390
D
1278 1910 2028 1440
A
433 656 938 687
B
541 790 950 751
C
686 972 986 814
D
806 1195 992 874
A 405 624 1057 758
B 549 808 1146 815
C 678 994 1256 882
D 784 1177 1349 946
A
556 837 1234 889
B
714 1022 1325 944
C
838 1206 1442 1019
D
991 1475 1528 1068
A
524 784 1759 1209
B
744 1078 1797 1249
C
927 1388 1840 1277
D
1185 1766 1881 1300
*100% CFM shown. CFM will vary propo rtionally with the gas valve BTU/H input.
*CVM970803BN
*CVM970804CN*
*CVM971005CN*
*MVM971005CN*
*MVM971205DN*
*CVM970603BN
*MVM970603BN*
*MVM970803BN*
*MVM970804CN*
Airflow Table
BLOWER HEAT OFF DELAY TIMINGS
The integrated control module provides a selectable heat off
delay function. The heat off delay period may be set to 90, 120,
150, 180 seconds using the DIP switches or jumper provided on
the control module. The delay is factory shipped at 150 seconds
but may be changed to suit the installation requirements and/
or homeowner preference.
ComfortNet System
OVERVIEW
NOTE: DIP switch #13 MUST be set to match thermostat
type. To use the CTK01 communicating thermostat, DIP
switch #13 must be set to ON position. This is also the
correct setting for a non-communicating 2-stage thermo-
stat. To use the CTK02**, CTK03 & CTK04 modulating ther-
mostat, check to make sure DIP switch #13 is in the OFF
position (factory position). This is also the correct position
when using a non-communicating single stage thermostat.
The ComfortNet system is a system that includes a ComfortNet
compatible furnace and air conditioner or heat pump with a
CTK0* thermostat. A valid ComfortNet system could also be a
compatible furnace, CTK0* communicating, single stage air
conditioner. Any other system configurations are considered
invalid ComfortNet systems and must be connected as a tradi-
tional (or non-communicating) system (see Electrical Connec-
tions for wiring connections).
A ComfortNet heating/air conditioning system differs from a
non-communicating/traditional system in the manner in which
the indoor unit, outdoor unit and thermostat interact with one
another. In a traditional system, the thermostat sends com-
mands to the indoor and outdoor units via analog 24 VAC sig-
nals. It is a one-way communication path in that the indoor and
outdoor units typically do not return information to the thermo-
stat.
The indoor unit, outdoor unit and thermostat comprising a
ComfortNet system “communicate” digitally with one another,
creating a two-way communications path. The thermostat still
sends commands to the indoor and outdoor units. However,
the thermostat may also request and receive information from
both the indoor and outdoor units. This information may be
displayed on the ComfortNet thermostat. The indoor and out-
door units also interact with one another. The outdoor unit may
send commands to or request information from the indoor unit.
This two-way digital communications between the thermostat
and subsystems (indoor/outdoor unit) and between subsystems
is the key to unlocking the benefits and features of the
ComfortNet system.
12RC
12
RC
CTK0*
Thermostat
ComfortNet Compatible
Furnace Integrated
Control Module
ComfortNet Compatible
AC/HP Integrated
Control Module
40VA Transformer
208/230 VAC
24 VAC
12RC
System Wiring using Two-Wires between Furnace and AC/HP and
Four-Wires between Furnace and Thermostat
COMFORTNET COMPATIBLE FURNACE WITH NON-COMFORTNET
SINGLE-STAGE AIR CONDITIONER
Four wires are required between the furnace and thermostat.
Two wires are required between the furnace control and single
stage air conditioner. For this system configuration, the “Y1”
terminal on the integrated furnace control becomes an output
rather than an input. The “Y1” connection to the outdoor unit
is made using both 4-position thermostat connectors in the
CTK0* kit. Remove the red keying tabs from the on-board
connector block and position both 4-position connector such
that “1”, “2”, “R”, “C”, and “Y1” positions are filled.
OPERATION