Daikin Sky Air R-407C - Discharge Pipe Temperature Control

General Functionality ESIE02–01
2–16 Part 2 – Functional Description
3
1
2
4
5
1.11 Discharge Pipe Temperature Control
Applicable units R(Y)P71-250B
Purpose The purpose of the discharge pipe temperature control is to prevent a discharge pipe temperature that
is too high or too low.
Low temp.
starting conditions
The table below contains the low temperature conditions to start the discharge pipe temperature
control.
High temp.
starting conditions
The table below contains the high temperature conditions to start the discharge pipe temperature
control.
Used input The discharge pipe temperature control uses the following inputs:
Function Description Starting conditions
F3-error occurs if
the conditions...
Wet operation Prevents liquid suction to
the compressor.
■ Change in E.V. opening
< 50 pulses
■ Td < Tc + 10˚C
Are met for 15 min
continuously.
Thermistor
out
Detects if the discharge
thermistor is not in the cor-
rect position.
■ Td < 55˚C
■ After start-up + 5 min:
- ∆Td ≤ 5 K
- Td < Ta + 10˚C
Are repeated 6
times.
Function / description Starting conditions
F3-error occurs if
the conditions...
Detects too high discharge gas
temperatures.
Td ≥ 125˚C for 20 s continuously Are repeated 6
times.
Input
Connection on
indoor PCB
Connection on
outdoor PCB
Outdoor discharge thermistor — R3T-X6A
Outdoor heat exchanger thermistor — R2T-X5A
Indoor heat exchanger thermistor R2T-X18A —