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Site Preparation and Installation
Liebert
®
Mini-Mate2
™
18
Connections for Ducted Systems
Use flexible duct work or non-flammable cloth collars to attach duct work to the unit and to help
control the transmission of vibrations to building structures. Insulation of duct work is vital to
prevent condensation during the cooling cycle. The use of a vapor barrier is required to prevent
absorption of moisture from the surrounding air into the insulation.
If the return air duct is short or if noise is likely to be a problem, sound-absorbing insulation should
be used inside the duct. Duct work should be fabricated and installed in accordance with national and
local codes.
Additional components such as a free-cooling coil, hot water reheat coil or high efficiency filters will
reduce available static pressure.
5.4.3 Piping Connections and Coolant Requirements
Drain Line
NOTICE
Risk of water backing up in the evaporator coil drain line and overflowing the drain pan. Can
cause building and equipment damage.
Do not install an external trap in the drain line. This line already has a factory-installed trap
inside the cabinet.
This line may contain boiling water. Use copper or other suitable material for the drain line.
A 3/4 in. (19.1 mm) NPT-female connection is provided for the evaporator coil condensate drain. This
line also drains the humidifier, if applicable. The drain line must be located so it will not be exposed to
freezing temperatures. The drain should be the full size of the drain connection.
The evaporator drain pan includes a float switch to prevent unit operation if drain becomes blocked.
The optional condensate pump kit is required when the evaporator is installed below the level of the
gravity-fed drain line.
Humidifier Water Supply Line
Units supplied with the optional humidifier package have a 1/4 in. (6.4 mm) copper compression
fitting connection for water inlet. Supply pressure range is 10 psig to 150 psig. Required flow rate is
1 gpm (3.8 lpm). A shut-off valve should be installed in this line to isolate the humidifier for
maintenance.
Table 7 Evaporator external static pressure
Turns
Open
1.5 hp Motor (60hz) 2.0 hp Motor (60hz)
Blower
rpm
External
Static, in.
Blower
rpm
External
Static, in.
1n/a n/a 1329 n/a
1.5 n/a n/a 1296 n/a
2 1037 0.9 1264 n/a
2.5 1005 0.7 1231 1.5
3 972 0.6 1199 1.4
3.5 940 0.5 1164 1.3
4 907 0.4 1134 1.2
4.5 875 0.3 1102 1.1
5 843 0.2 1069 1.0
5.5 810 0.1 1037 0.9
6 778 0.0 1005 0.7
NOTE
Do NOT route humidifier supply line in front of filter box access panel.