Daikin EWAT016CZN-A1, Installation, Maintenance And Operation Manual

Page: 20 / 30

DEIMHP0140521_00EN
20
EWYT~CZ / EWAT~CZ
7.2.2. Electrical Installation
All electrical maintenance activities must be followed by
qualified personnel. Make sure the system is switched off
and the main switch of the unit open. Failure to observe this
rule could result in serious personal injury. When the unit is
turned off but the disconnection switch is in the closed
position, the unused circuits will still be active.
The maintenance of the electrical system consists of the application
of some general rules as follows:
1. the current absorbed by the compressor must be compared to
the rated value. Normally the value of the absorbed current is
lower than the rated value that corresponds to the absorption of
the full load compressor at the maximum operating conditions;
2. at least once every three months all the security checks must be
made to verify their functionality. Each appliance, with aging, can
change its point of operation and this must be monitored to
adjust it or replace it. The pump interlocks and flow switches
must be checked to make sure that they interrupt the control cir-
cuit if they intervene.
7.2.3. Service and limited warranty
All units are factorytested and guaranteed for 12 months as of the first
startup or 18 months as of delivery.
These units have been developed and constructed according to high
quality standards ensuring years of failurefree operation.
However,
the unit requires maintenance even during the warranty period,
from the time of installation and not just from the commissioning
date.
We strongly advise stipulating a maintenance contract with a
service authorized by the manufacturer to ensure efficient and
problemfree service, thanks to the expertise and experience of our
personnel.
It must be borne in mind that operating the unit in an inappropriate
manner, beyond its operating limits or not performing proper
maintenance according to this manual can void the warranty.
Observe the following points, to conform to warranty limits:
1. The unit cannot function beyond the specified limits;
2. The electrical power supply must be within the voltage limits and
without voltage harmonics or sudden changes;
3. The threephase power supply must not have an unbalance
between phases exceeding 3%. The unit must stay turned off
until the electrical problem has been solved;
4. No safety device, either mechanical, electrical or electronic must
be disabled or overridden;
5. The water used for filling the water circuit must be clean and sui-
tably treated. A mechanical filter must be installed at the point
closest to the BPHE inlet;
6. the value of the BPHE water flow must be included in the decla-
red range for the unit considered, refer to the CSS selection
software.
List of Activities Weekly
Monthly
(Note 1)
Yearly/Seasonal
(Note 2)
General:
Reading of operating data (Note 3)
X
Visual inspection of unit for any damage and/or loosening
X
Verification of thermal insulation integrity
X
Paint where necessary
X
Analysis of water (4)
X
Check of flow switch operation
X
Electrical Installation:
Verification of control sequence
X
Verify contactor wear – Replace if necessary
X
Verify that all electrical terminals are tight – Tighten if necessary
X
(Quarterly)
Clean inside the electrical control board
X
Visual inspection of components for any signs of overheating
X
Verify operation of compressor and electrical resistance
X
Refrigeration circuit:
Check for any refrigerant leakage (leak test)
X
Hydraulic circuit:
Check for any water leakage
X
Check hydraulic connections
X
Check the pressure at the pump inlet
X
Clean the water filter
X
Check the glycol concentration
X
Check the water flow rate
X
Check the safety valve
X
Coil section:
Check the cleaning of coils and water heat exchangers (Note 6)
X
Verify that fans are well tightened
X
Verify the coil fins
X
BPHE:
Check the cleaning of the BPHE
X
Table 10 – Standard Routine Maintenance Plan
Notes:
1.
Monthly activities include all the weekly ones.
2.
The annual (or early season) activities include all weekly and monthly activities.
3.
Daily reading of the operating values of the unit allows maintaining high observational standards.
4.
Check for any dissolved metals.
5.
Clean condenser banks with clean water and water heat exchangers with appropriate chemicals. Particles and fibers could clog up the exchangers, especially for
water exchangers pay attention if water rich in calcium carbonate is used. An increase in pressure drops or a decrease in thermal efficiency means that the heat
exchangers are clogged. In environments with a high concentration of airborne particles, it might be necessary to clean the condenser bank more often.
6.
Units placed or stored in a Highly Aggressive Environment for long time without operation are still subject to those routine maintenance steps.