Table of Contents
5.4.1
Evaporator Air Distribution
Filter Box
The optional filter box available for the unit attaches directly to the return air opening of the
evaporator. The filter box is supplied with a filter measuring 16" x 20" x 1" (406 x 508 x 25mm).
Grille Installation
The airflow grilles are directional devices and MUST be installed with the louvers properly aligned
for unit to operate properly. An air baffle is included with the grille kit and must be installed to
ensure proper air distribution. Locate the return and discharge grilles as shown in the grille kit
instructions. Lower the grilles into place with the louvers in the proper direction. Note that a field-
supplied T-bar is required between the two grilles. If required, grilles may be screwed directly to the
sub-base.
Install the disposable filter (20" x 20" x 1") in the return grille. Do not operate the Liebert Mini-Mate2
without the filter installed in the return air grille. Refer to instructions shipped with kit for more
details. The evaporator unit should be lowered until the gasket material is compressed 1/4" (6 mm).
CAUTION
!
Risk of the grille falling. Can cause equipment damage or injury.
Do not allow the weight of the unit to rest on the grilles.
5.4.2
Piping Connections and Coolant Requirements
The following pipe connections are required:
• A drain line from the evaporator coil drain pan. This line also serves as the drain for the optional
humidifier.
• A water supply line to the optional humidifier (if applicable).
• Refrigerant piping connections between the evaporator unit and the outdoor condensing unit (for
split systems). If the evaporator unit is a chilled water model, connections to the building chilled
water source are required.
• Connections to a water or glycol loop on water/glycol type systems.
Drain Line
NOTICE
Risk of water backing up in the drain line. Leaking and overflowing water can cause
equipment and building damage.
The drain line must not be trapped outside the unit.
A 3/4 in. 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 operation if the drain becomes blocked.
The optional condensate pump kit is required when the evaporator is installed below the level of the
gravity-fed drain line.
NOTE
Remove the shipping band from the float switch in the evaporator pan before operating the
unit.
19
Site Preparation and Installation
®
Liebert
Mini-Mate2
™
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