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Service Manual VMH SerieS Heat Controller, Inc.
6.2 Pipe length and the elevation:
1. Single Zone “V” Series Inverter System:
Capacity Pipe Size Standard Max Total Additional
Btu/h Gas Liquid Length Elevation Line Length (ft) Refrigerant
(in) (in) (ft) (ft) Min. Max. oz/ft
9k 3/8 1/4 *16.5 26 10 65.5 .2
12k 1/2 1/4 *16.5 26 10 65.5 .2
18k 1/2 1/4 *16.5 32 10 82 .2
24k 5/8 3/8 *16.5 32 10 82 .4
Refrigerant Charge (oz)
Unit Model # Heat Pump
VMH09SC 38.8 oz.
VMH12SC 44.1 oz.
VMH18SC 58.2 oz.
VMH24SC 67.0 oz.
*Unit charge located on rating plate includes enough refrigerant for 16.5 feet of line set.
*Charge adjustment is not required on line set lengths less than 16.5 feet.
*Capacity is based on standard line set lengths and maximum length is based on reliability.
Oil Traps:
It is not necessary to install oil traps when outdoor unit is located lower than indoor unit.
It is recommended that a trap be installed when outdoor unit is installed 16.5’ higher than indoor unit.
A
B
A
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