Defrost Operation; Emergency Heat Operation; Electric Heater (Optional Item); Temperature Rise - Daikin ComfortNet DX16TC Series Service Instructions Manual

SERVICING

4.0 Defrost Operation

4.1 While the system is operating in heat pump heating (see
2.0 Heating Operation), the control in the outdoor unit
may determines that a defrost cycle is needed. Upon
determing that a defrost cycle is needed, the UC control
de-energizes the condensor fan motor and energizes the
reversing valve.
4.2 The compressor may be de-energized for a short de-
lay during the reversing valve shift. (The delay period is
adjustable via the CTK0* thermostat. The compressor
delay is intended to eliminate compressor noise during
the reversing valve shift.) The compressor will energize (or
re-energize) at high stage.
4.3 The UC control sends a request for defrost operation to
the integrated air handler control. The air handler control
energizes the electric heat sequencer outputs and oper-
ates the ECM blower model at the electric heat speed.
4.4 Once the defrost cycle is terminated, the heat pump
commands the air handler/modular blower to end defrost
operation.
4.5 The system returns to heat pump heating operation that
was in effect prior to the defrost cycle.

5.0 Emergency Heat Operation

5.1 The CTK0* thermostat sends a request for emergency
heat to the air handler/modular blower.
5.2 The air handler control energizes the ECM blower motor
at the emergency heat speed. The electric heat sequencer
outputs are also energized, thus energizing the electric
heaters.
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 thermostat.
The fan demand provided by the thermostat will be 30%,
50%,or 70% of the air handler's maximum airflow capabili-
ty. 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 resis-
tance 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 installa-
tion.
Other components such as a Heating/Cooling Thermostat and
Outdoor Thermostats are available to complete the installa-
tion.
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 measured.
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
EXAMPLE: Five (5) heaters provide 24.0 KW at the rated 240V.
Our actual measured voltage is 220V, and our measured tem-
perature 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 installations.
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
CFM
kW kW
600 16 25
700 14 22
800 12 19
900 11 17
1000 10 15
1100 9 14
1200 8 13
1300 7 12
1400 7 11
1500 6 10
1600 6 9
1700 6 9
1800 5 8
1900 5 8
2000 5 8
2100 5 7
2200 4 7
2300 4 7
86
250 230 220
1.08 .92 .84
7.2 9.6 14.4 19.2 24.0
kW kW kW kW kW
38 51 - -
33 43 - -
29 38 57 -
26 34 51 -
23 30 46 -
21 27 41 55
19 25 38 50
18 23 35 46
16 22 32 43 54
15 20 30 40 50
14 19 28 38 47
14 18 27 36 44
13 17 25 34 42
12 16 24 32 40
12 15 23 30 38
11 14 22 29 36
11 14 21 27 34
10 13 20 26 33
208
.75
28.8
kW
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65
60
57
53
50
48
45
43
41
39