Commissioning; Preparation; Inspection; Refrigerant Charge - York YGWH 115 Installation, Commissioning & Operation

5.

Commissioning

Preparation

Commissioning of this unit should only be
carried out
Authorised personnel.
This section must be read in conjunction with
the control system operation, in Section 6.
Power Off
The following basic checks should be made with the
customer power supply to the unit switched off.
Ensure all sources of supply to the unit are
locked off, in the OFF position.

Inspection

Inspect unit for installation damage. If found, take
action or repair as appropriate.

Refrigerant Charge

Packaged units are normally shipped as standard with a
full refrigerant operating charge. Check that refrigerant
pressure is present in the system and that no leaks are
apparent. If no pressure is present, a leak test must
be undertaken, located and repaired the leak(s). These
systems must be evacuated with a suitable vacuum
pump/recovery unit as appropriate to below 500 mHg.

Valves

Open discharge valve on compressor and liquid line
angle valve under condenser fully (counter-clockwise)
then close one turn of the stem to ensure operating
pressure is fed to pressure transducers. Open all angle
valves on the oil return line and eductor line.

Isolation / Protection

Verify all sources of electrical supply to the unit are
taken from a single point of isolation.

Control Panel

Make sure the control panel is free of foreign materials
(wire, metal chips, etc.) and clean out foreign materials
if found.

Power Connections

Check that the customer power cables are connected
correctly to the circuit breaker. Ensure that connections
of power cables within the panels to the circuit breaker
are tight.
EN
by Johnson Controls
Form 6S6I-B01C-EOMA-EN (0318)

Earthing

Make sure all the protective conductor is properly and
tightly connected to the ground.

Oil heater

Verify that the oil heater is powered on. If the chiller
has not had power applied for more than 15 days, the
compressor are not allowed to run unless the oil heater
has been on for more than 5 hours.

Water System

Verify the chilled liquid system has been installed
correctly, and has been commissioned with the correct
direction of water flow through the cooler. The inlet
should be connected to the bottom nozzle of water box
of the cooler and the outlet to the top one. Purge air
using the plugged air vent mounted on the top of water
box.
Flow rates and pressure drops must be within the limits
given in the Section 9. Out of these limits is undesirable
and could cause damage.

Low Temperature Brine Chiller

Confirm the freezing point of the evaporator brine fluid,
using a hydrometer or an optical refractometer to test
the concentration of the birne and calculate the freezing
point. Concentrations and freezing points of glycol
solution:
E.G wt% Freezing point °C E.G wt% Freezing point °C
5 -1.4
10 -3.28
15 -5.31
When working on the ITS mode, the LOW LELT / LEP
UNLOAD / LEP SHUT DOWN should be reset. Confirm
that the temperature corresponding to the LOW LELT /
LEP UNLOAD / LEP SHUT DOWN are higher than the
freezing point of brine, and that any of these two values
should be at least 3°C higher than the brine freezing
point.
Saturated temperature of R134a in difference pressure:
Sat. Press. Sat.
Temp.°C kPa Temp.°C
-15 16 4 -8
-14 17 1 -7
-13 17 8 -6
-12 18 5 -5
-11 19 3 -4
-10 20 1 -3
-9 20 9 -2

Flow Switch

Verify a chilled water flow switch is correctly fitted in the
customer's piping on the cooler outlet, and wired into
the control panel correctly using shielded cable.
20 -7.8
26 -11.38
30 -14.04
Press. Sat. Press.
kPa Temp.°C kPa
21 7 -1 282
22 5 0 293
23 4 1 304
24 3 2 315
25 3 3 326
26 2 4 338
27 2 5 350
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