Special Precautions When Dealing With R410A Unit; Control Operation Guide; Unit Operation Limits - McQuay 5WSS Serie Manual De Instrucciones

SPECIAL PRECAUTIONS WHEN DEALING WITH R410A UNIT

• R410A is a near azeotrope refrigerant mixture of hydro fluorocarbon (HFC) which is environmental friendly. It has Zero
Ozone Depletion Potential (ODP=0) and this conform to Montreal Protocol regulations.
• R410A system has a operating pressure of about 1.6 times higher than R22 at the same temperature.
• Never use copper tubes thinner than 0.8mm.
• R410A compressor uses polyol-ester oil (POE) as lubricant which is prone to moisture contamination (hydroscopic).
Hydrolysis may occur that will generate acid when mix with moisture or water and will damage the compressor winding.
• It has to be treated in a more cautiously manner than other conventional mineral oil.
• Do not expose the system for too long. POE oil will absorb moisture into the system that will generate acid and cause
capillary clogging or compressor motor winding damage. Cover temporary the refrigerant valve or copper tube opening
when performing installation or servicing. Install a bi-flow filter dryer (two-way) along the liquid piping to absorb the
unwanted moisture. Residue POE oil in the piping and components can absorb moisture from the air.
• Do not mix R410A with other refrigerant into the system.
• Identified refrigerant before charging. R410A refrigerant cylinder is pink coated. Charge only R410A liquid phase into the units.
• Do not add any additional oil into the compressor.
• Use only exclusive tools and equipment for R410A:
i) Manifold gauge and charging hose
ii) Gas leak detector
iii) Refrigerant cylinder (usually pink coated)
iv) Vacuum pump c/w adaptor
v) Flare tools
vi) Refrigerant recovery machine
• R410A must be charged in liquid phase. Usually R410A cylinder is equipped with a dip pipe for liquid withdrawal. If
there is no dip pipe, invert the cylinder to withdraw R410A liquid.
• If leak occurs, do not top-up any additional R410A refrigerant as this will reduce the unit performance. Instead
evacuate the refrigerant and fix the leakage before vacuuming it thoroughly. Then charge with new R410A refriger-
ant according to the recommended specification.
• If refrigerant gas leak occurs during installation / servicing, make sure the area is ventilate fully.
• Do not allow the piping and unit exposed to air or moisture.
• Install a bi-flow filter dryer (two way) along the liquid line.
• Controller of water source heat pump split type unit is located in the fan coil unit.
• Refer to fan coil unit installation manual for control guide operation.
Environment
This unit is designed for indoor installation and operation only. This unit also limited to water loop application only as the heat
exchanger can only cater for this application.
Power Supply
A voltage variation of +/- 10% of rated voltage stated in the unit label is acceptable.
Allowable Operation Conditions
Ensure the operating temperature and condition are in allowable range. Extreme variations in temperature, humidity and
corrosive water or air will adversely affect unit performance, reliability and service life.
Heat Pump
32
20
12
Indoor Temp. (
! ! ! ! ! CAUTION

CONTROL OPERATION GUIDE

UNIT OPERATION LIMITS

Heating
STD
15 20 27
o
C DB)
Cooling
45
30
STD
13
15 19
Indoor Temp. (
1-6
24
o
C WB)