![Fig. 1 — Horizontal Conversion Panels](/images/new-backgrounds/33793/337933x1.webp)
Fig. 1 — Horizontal Conversion Panels
Curb should be level. Unit leveling tolerances are shown in Fig. 3. This is necessary for unit drain to function properly. Re- fer to Accessory Roof Curb Installation Instructions for addi- tional information as required.
SLAB MOUNT (Horizontal Units Only) — Provide a level concrete slab that extends a minimum of 6 in. beyond unit cabinet. Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if required.
Step 2 — Field Fabricate Ductwork — Secure all
ducts to roof curb and building structure on vertical ducted units. Do not connect ductwork to unit. For horizontal applica- tions,
Ducts passing through an unconditioned space must be in- sulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applica- ble fire codes.
A minimum clearance is not required around ductwork. Cabinet return air static shall not exceed
These units are designed for a minimum continuous heating
Step 3 — Install External Trap for Condensate Drain — The unit’s
When using the standard side drain connection, make sure the plug (Red) in the alternate bottom connection is tight before installing the unit.
To use the bottom drain connection for a roof curb installa- tion, relocate the
All units must have an external trap for condensate drain- age. Install a trap at least
Step 4 — Rig and Place Unit — Inspect unit for
transportation damage. File any claim with transportation agency. Keep unit upright and do not drop. Spreader bars are not required if top crating is left on unit. Rollers may be used to move unit across a roof. Level by using unit frame as a refer- ence. See Table 1 and Fig. 5 for additional information.
Lifting holes are provided in base rails as shown in Fig. 6. Refer to rigging instructions on unit.
All panels must be in place when rigging.
POSITIONING — Maintain clearance around and above unit to provide minimum distance from combustible materials, proper airflow, and service access. See Fig. 6. A properly posi- tioned unit will have the following clearances between unit and roof curb:
Do not install unit in an indoor location. Do not locate unit air inlets near exhaust vents or other sources of contaminated air.
Be sure that unit is installed such that snow will not block the combustion intake or flue outlet.
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