NOTE: Elevation of the unit may be accomplished by constructing a frame using suitable materials. If a support frame is constructed, it must not block drain holes in unit base.
•When installed in areas where low ambient tempera- tures exist, locate unit so winter prevailing winds do not blow directly into outdoor coil.
•Locate unit away from overhanging roof lines which would allow water or ice to drop on, or in front of, coil or into unit.
Slab Mounting
When installing a unit at grade level, install on level slab high enough above grade so that water from higher ground will not collect around the unit (see Figure 2).
Slab Mounting |
Discharge Air |
Building |
Structure |
Mounting Slab |
Ground Level |
Figure 2
Roof Mounting
Install unit at a minimum of 6" above surface of the roof to avoid ice buildup around the unit. Locate the unit above a load bearing wall or area of the roof that can adequately support the unit. Consult local codes for rooftop applications.
Electrical Wiring
All field wiring must be done in accordance with the National Electrical Code (NEC) recommendations, Canadian Electrical Code (CEC) and CSA Standards, or local codes, where applicable.
WARNING
Unit must be grounded in accordance with national and local codes. Failure to ground unit properly can result in personal injury or death.
Refer to the furnace or blower coil Installation Instructions for additional wiring application diagrams and refer to unit rating plate for minimum circuit ampacity and maximum overcurrent protection size.
1.Install line voltage power supply to unit from a properly sized disconnect switch. Any excess high voltage field wiring should be trimmed or secured away from the low voltage field wiring.
2.Ground unit at unit disconnect switch or to an earth ground. To facilitate conduit, a hole is in the bottom of the control box. Connect conduit to the control box using a proper conduit fitting. Units are approved for use only with copper conductors. 24V Class II circuit connections are made in the low voltage junction box. A complete unit wiring diagram is located inside the unit control box cover (see also page 26 of this instruction).
3.Install room thermostat on an inside wall that is not subject to drafts, direct sunshine, or other heat sources.
4.Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit (see Figure 3 on page 4).
5.Do not bundle any excess 24V control wire inside control box. Run control wire through installed wire tie and tighten wire tie to provide low voltage strain relief and to maintain separation of
WARNING
Line voltage is present at all components when unit is not in operation on units with single pole contactors. Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power supplies. Failure to disconnect all power supplies could result in personal injury or death.
Refrigerant Piping
WARNING
Refrigerant can be harmful if inhaled. Refrigerant must always be used and recovered responsibly. Incorrect or irresponsible use of refrigerant can result in personal injury or death.
If the 4HP16LT unit is being installed with a new indoor coil and line set, the refrigerant connections should be made as outlined in this section. If an existing line set and/ or indoor coil will be used to complete the system, refer to
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