Daikin EUWAB10KBZW1, Service Manual

Page: 190 / 210

Pre-Test Run Checks ESIE11-02
4–24 Part 4 – Commissioning and Test Run
3
1
4
5
Normal heating The table below contains the normal condition of the 4-way valve in heating mode.
The valve does not
shift from cooling to
heating The table below contains the possible checks for finding the cause for the valve not shifting from
cooling to heating and the corresponding procedure to solve the problem.
Discharge
tube 1 Suction
tube 2
Tube to the
plate heat
exchanger
Tube to the
air-cooled
heat
exchanger
Left pilot
back capil-
lary tube Right pilot
back capil-
lary tube
Hot Cool Hot as in
column 1 Cool as in
column 2 Temperature
of valve body Temperature
of valve body
Check Cause Procedure
Check the electrical circuit. No voltage to the coil Repair the electrical circuit.
Check the coil. Coil is defective. Replace the coil.
Check the refrigerant charge. Charge is low. 1. Repair the refrigerant charge.
2. Recharge the system.
Pressure differential is
too high. Re-check the system.
Check the operation conditions in the following table to find the cause of the malfunction.
The procedure for solving the problem is described in the last column.
See the illustration to situate the numbers in the table heading.