Pipework Arrangement; Connection Types And Sizes; Refrigerant Relief Valve Piping; Electrical Connection - York YGWH 115 Installation, Commissioning & Operation

Quality requirement of water used in chiller
Name Unit Allowable value Corrosion Fouling
PH value(25°C) -
Conductivity(25°C) s/cm
Chloridion mg/L
Sulphate ion mg/L
Acid wastage mg/L
Total Hardness mg/L
Calcium Hardness mg/L
SiO2 mg/L
Notes:
1. The user should make regular inspections on
the water quality before installation and during use. If
the water quality does not meet the requirements, the
heat exchange tubes will be in the danger of fouling,
corruption and even leakage when using the 'Defective'
water long term.
2. Testing about the influence of using 'Defective'
water whose quality exceeds the limits for long term
shows that, the chiller will fail to run normally due to the
heat exchanger tubes corrupting and leakage.
3. Fouling testing about the influence of using
'Defective' water whose quality exceeds the limits
for long term shows that, the chiller capacity will be
decreasing due to the heat exchanger tube fouling.
4. The water should be drained out of the heat
exchangers, if the unit is stopped for a long time, it is
suggested that the heat exchanger tubes should be
cleaned after each long term stop.
5. User will be responsibility for any losses
caused by poor water quality.

Pipework Arrangement

The following are suggested pipework arrangements for
single unit installations. For multiple unit installations,
each unit should be piped as per the relative drawings.

Connection Types and Sizes

Please refer to the physical data table for connection
sizes of each model.
The piping connections of evaporator and condenser
are victaulic grooves as standard, HG20615 welded
flanges are available as an option.

Refrigerant Relief Valve Piping

The evaporator and condenser are each protected
against internal refrigerant overpressure by refrigerant
relief valves. It is recommended that each valve should
be piped to the exterior of the building so that when the
valve is activated the release of high pressure gas and
liquid cannot be a danger or cause injury.
EN
6.5 to 8.0 X
<800 X
<200 X
<200 X
<100
<200
<150
<50
Form 6S6I-B01C-EOMA-EN (0318)
X
X
X
X
The size of any pipework attached to a relief valve must
be of sufficient diameter so as not to cause resistance
to the operation of the valve. Unless otherwise specified
by local regulations, the internal diameter depends on
the length of pipe required and is given by the following
formula:
D5 =1.447 x L
Where:
D = minimum pipe internal diameter in centimetres
(cm) L =length of pipe in meters (m)
If relief pipework is common to more than one valve, its
cross sectional area must be at least the total required
by each valve. Valve types should not be mixed on a
common pipe. Precautions should be taken to ensure
that the exit of relief valves/vent pipe remain clear of
obstructions at all times.

Electrical Connection

The following electrical connection recommendations
are intended to ensure safe and satisfactory operation
of the unit. Failure to follow these recommendations
could cause harm to persons, or damage to the unit,
and may invalidate the warranty.
No additional controls (relays, etc.) should be mounted
in the control panel. Power and control wiring not
connected to the York control panel should not be run
through the control panel. If these precautions are
not followed it could lead to a risk of electric shock. In
addition, electrical noise could cause malfunctions or
damage the unit and its controls.
Since some internal components are live when main
power is switched on, the unit should not be switched
on, until it has been commissioned by York authorized
personnel after connection.

Condenser Cooling Water System

For YGWH units, condensers are usually piped in
conjunction with a cooling tower.
With water cooled units it is necessary to control the
condenser water flow and/or temperature into the
condenser to maintain refrigerant pressure as constant
as possible to ensure satisfactory operation of the unit.
4-5