Carrier RAV-SP180UT-UL Service Manual page 53

No. Item
3 Room temp. 2) Using the CODE No. 06, the setup temperature in heating
control
(Continued)
4 Automatic 1) Based on the difference between Ta and Ts, the operation frequency is instructed to
capacity control
(GA control)
2) Cooling operation
3) Heating operation
4) Dry operation
Note) When LOW is set up, the maximum frequency is limited to approximately "SB".
5 Automatic 1) The judgment of selecting COOL/HEAT is carried out as
cooling/heating
control
2) For the automatic capacity control after judgment of cooling/heating, see Item 4.
3) For temperature correction of room temp. control in automatic heating, see Item 3.
Outline of specifications
operation can be corrected.
SET DATA 0
Setup temp. +0°F
correction (+0°C)
Setting at shipment
SET DATA 2
• When use of remote controller sensor is set (with DN32),
no correction is performed.
the outdoor unit.
Every 90 seconds, the room temperature difference between temperature detected by
Ta and Ts and the varied room temperature value are calculated to obtain the
correction value of the frequency command and then the present frequency command
is corrected.
Ta (n) – Ts (n) : Room temp. difference
n : Counts of detection
Ta (n-1) – Ts (n) : Varied room temp. value
n – 1 : Counts of detection of 90 seconds before
Every 1 minute (60 sec.), the room temperature difference between temperature
detected by Ta and Ts and the varied room temperature value are calculated to obtain
the correction value of the frequency command and then the present frequency
command is corrected.
Ts (n) – Ta (n) : Room temp. difference
n : Counts of detection
Ta (n) – Ta (n – 1) : Varied room temp. value
n – 1 : Counts of detection of 1 minute before
The frequency correction control is same as those of the cooling operation.
However the maximum frequency is limited to approximately "S6".
shown below. When +2.7°F (+1.5°C) exceeds against Tsh
10 minutes and after thermo.-OFF, heating operation
(Thermo. OFF) exchanges to cooling operation.
Description in the parentheses shows an example of
cooling ON/OFF.
Ta ˚F [˚C] Cooling
+2.7 [+1.5]
Tsc or Tsh
–2.7 [–1.5]
When –2.7°F (–1.5°C) lowers against Tsc 10 minutes and after thermo. OFF, cooling
operation (Thermo. OFF) exchanges to heating operation.
2 4
+3.6°F +7.2°F +10.8°F
(+2°C) (+4°C) (+6°C)
(Cooling ON)
(Cooling OFF)
Heating
– 53 –
Remarks
Shift of suction
temperature in heating
operation
6
Tsc: Setup temp. in
cooling operation
Tsh: Setup temp. in
heating operation
+ temp. correction
of room temp. control