R-454B pipework
DANGER
Ensure there is no potential ignition sources within 4 ft (1.2 m) in all directions from the outlet of the
relief valve piping.
Dual pressure relief valves are installed in each circuit on both the high and low pressure sides.
There are two external vent pipes in each refrigerant system. The pipes are shipped loose and the
connection is 7/8-14UNF.
Remove the panels to connect the vent pipes that are shipped loose with the unit.
CAUTION
Check that all vent pipes are correctly connected after the chiller is in its final location.
Water treatment
The unit performance is based on a standard fouling factor of 0.0001 h ft
2
°F/Btu. Dirt, scale,
grease and certain types of water treatment adversely affect the heat exchanger surfaces and unit
performance.
Note: Foreign matter in the water systems can increase the pressure drop, reducing the flow
rate and causing potential damage.
Do not use aerated, brackish, or salt water in the water systems. Johnson Controls suggests
consulting a water treatment specialist to determine whether the proposed water composition
could affect the heat exchanger materials of carbon steel and copper. Keep the pH value of the
water flowing through the unit between 7 and 8.5.
Refrigerant relief valve piping
The unit is protected against internal refrigerant overpressure by refrigerant relief valves. For
indoor installations, pipe pressure relief valves and vent to the exterior of the building.
Note: Only install R-454B units in outdoor or unenclosed areas.
The size of any extended 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. Use the following formula to estimate the internal diameter:
D
5
=1.447 x L
Where:
D = minimum pipe internal diameter (cm)
L = length of pipe (m)
If relief pipework is common to more than one valve, its cross sectional area must be at least the
total required by each individual valve.
YMAE Air-Cooled Inverter Scroll Chiller and Heat Pump58
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