Carrier 23XRV manual Insulation, → Minimum fluid loop volume, Condensation Vs Relative Humidity

Insulation

23XRV MINIMUM FIELD-INSTALLED INSULATION

REQUIREMENTS

COMPONENT	SIZE	INSULATION
		ft2	m2
	30-32	96	8.9
	35-37	108	10.0
Cooler	40-42	109	10.1
	45-47	122	11.3
	50-52	115	10.7
	55-57	130	12.1
Misc. Liquid Lines	All Sizes	21	2.0
Economizer	All Sizes	20	1.9
Compressor Motor	All Sizes	17	1.6

Factory insulation — Thermal insulation is factory- provided to the following areas:

•Cooler (not including waterbox)

•Suction line

•Compressor and motor

•Oil cooling line and oil return system line (oil and refrig- erant lines at or near evaporator pressure are insulated)

•VFD cooling line (oil and refrigerant lines at or near evaporator pressure are insulated)

•Motor cooling line

•Vaporizer

•Liquid line and discharge line

•Float chamber

•Optional economizer (including vent line and econo- mizer muffler)

Factory insulation is not available for the waterboxes.

Insulation applied at the factory is 1/2-in. (13 mm) thick closed cell and 1/2-in. (13 mm) open cell PVC-Nitrile foam. Some parts of the chiller are also treated with an outer layer of 3/16-in. (5 mm) thick vinyl. The 1/2-in. (13 mm) closed cell foam has a thermal conductivity K value of 0.28 (BTU in.)/(hr sqft °F) [0.0404 W/(m °C)] and

conforms with Underwriters Laboratories (UL) Standard 94, Classification 94 HF-1. Both the 1/2-in. foam and the 3/16-in. vinyl layer will pass flammability test method MVSS 302.

Field insulation — As indicated in the Condensation vs Relative Humidity table, the factory insulation provides excellent protection against condensation under most op- erating conditions. If temperatures in the equipment area exceed the maximum design conditions, extra insulation is recommended.

If the machine is to be field insulated, obtain the approx- imate areas from the 23XRV Minimum Field-Installed Insu- lation Requirements table.

Insulation of waterbox is made only in the field and this area is not included in 23XRV Minimum Field-Installed In- sulation Requirements table. When insulating the covers, allow for service access and removal of covers. To estimate water-box cover areas, refer to certified drawings.

High humidity jobsite locations may require field sup- plied and installed insulation on the float chamber, suction housing, and the lower half of the condenser.

CONDENSATION VS RELATIVE HUMIDITY*

AMOUNT OF	ROOM DRY-BULB TEMPERATURE
	80 F (27 C)	90 F (32 C)	100 F (38 C)
CONDENSATION
	% Relative Humidity
None	80	76	70
Slight	87	84	77
Extensive	94	91	84

*These approximate figures are based on 35 F (1.7 C) saturated suction temperature. A 2° F (1.1° C) change in saturated suction temperature changes the relative humidity values by 1% in the same direction.

→Minimum fluid loop volume

Minimum fluid volume must be in excess of 1.5 gal per ton (20 L per kW) for comfort cooling applications and apply 3 to 5 gal per ton (40 to 66 L per kW) fluid loop volume for process applications.

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