Electric Heater (Optional Item) - Daikin ComfortNet DX18TC Service Instructions Manual

SERVICING
5.3 The system operates at emergency heat.
5.4 Once the thermostat demand is satisfied, the CTK0*
thermostat commands the air handler/modular blower to
end emergency heat operation. The air handler control
de-energizes the electric heat sequencer outputs. The
ECM blower motor remains energized until any blower
OFF delay timing has expired. energizes the variavble
speed ECM motor at fan demand provided by the thermo-
stat. The fan demand provided by the thermostat will be
30%, 50%,or 70% of the air handler's maximum airflow
capability. The continuous fan demand is set from the
thermostat as low, medium, or high.
S-60 ELECTRIC HEATER (OPTIONAL ITEM)
Optional electric heaters may be added, in the quantities
shown in the specifications section, to provide electric
resistance heating. Under no condition shall more heaters
than the quantity shown be installed.
The low voltage circuit in the air handler is factory wired and
terminates at the location provided for the electric heater(s).
A minimum of field wiring is required to complete the instal-
lation.
Other components such as a Heating/Cooling Thermostat
and Outdoor Thermostats are available to complete the
installation.
The system CFM can be determined by measuring the static
pressure external to the unit. The installation manual
supplied with the blower coil, or the blower performance table
in the service manual, shows the CFM for the static mea-
sured.
Alternately, the system CFM can be determined by operating
the electric heaters and indoor blower WITHOUT having the
compressor in operation. Measure the temperature rise as
close to the blower inlet and outlet as possible.
If other than a 240V power supply is used, refer to the BTUH
CAPACITY CORRECTION FACTOR chart below.
BTUH CAPACITY CORRECTION FACTOR
SUPPLY VOLTAGE
MULTIPLICATION FACTOR
76
250 230 220 208
1.08 .92 .84 .75
EXAMPLE: Five (5) heaters provide 24.0 KW at the rated
240V. Our actual measured voltage is 220V, and our
measured temperature rise is 42°F. Find the actual CFM:
Answer: 24.0KW, 42°F Rise, 240 V = 1800 CFM from the
TEMPERATURE RISE chart on the right.
Heating output at 220 V = 24.0KW x 3.413 x .84 = 68.8
MBH.
Actual CFM = 1800 x .84 Corr. Factor = 1400 CFM.
NOTE: The temperature rise table is for sea level installa-
tions. The temperature rise at a particular KW and CFM will
be greater at high altitudes, while the external static pressure
at a particular CFM will be less.
TEMPERATURE RISE (°F) @ 240V
3.0 4.8 7.2
CFM
kW kW kW
600 16 25 38
700 14 22 33
800 12 19 29
900 11 17 26
1000 10 15 23
1100 9 14 21
1200 8 13 19
1300 7 12 18
1400 7 11 16
1500 6 10 15
1600 6 9 14
1700 6 9 14
1800 5 8 13
1900 5 8 12
2000 5 8 12
2100 5 7 11
2200 4 7 11
2300 4 7 10
ELECTRIC HEATER CAPACITY BTUH
HTR 3.0 4.7 6.0
KW KW KW KW
BTUH 10200 16200 20400 23800 32400 48600 66500 71600
9.6 14.4 19.2 24.0 28.8
kW kW kW kW kW
51 - - -
43 - - -
38 57 - -
34 51 - -
30 46 - -
27 41 55 -
25 38 50 -
23 35 46 -
22 32 43 54 65
20 30 40 50 60
19 28 38 47 57
18 27 36 44 53
17 25 34 42 50
16 24 32 40 48
15 23 30 38 45
14 22 29 36 43
14 21 27 34 41
13 20 26 33 39
7.0 9.5 14.2 19.5 21.0
KW KW KW KW KW
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