13
Fig. 6 — Unit Leveling Tolerances
Install insulation, cant strips, roofing felt, and counter flashing
as shown. Ductwork must be attached to curb and not to the
unit. The accessory thru-the-base power and gas connection
package must be installed before the unit is set on the roof
curb. If field-installed thru-the-roof curb gas connections are
desired, use factory-supplied pipe coupling and gas plate as-
sembly to mount the thru-the-roof curb connection to the roof
curb. Gas connections and power connections to the unit must
be field-installed after the unit is installed on the roof curb.
If electric and control wiring is to be routed through the base-
pan, attach the accessory thru-the-base service connections to
the basepan in accordance with the accessory installation in-
structions.
SLAB MOUNT (HORIZONTAL UNITS ONLY)
Provide a level concrete slab that extends a minimum of 6 in.
(150 mm) beyond unit cabinet. Install a gravel apron in front of
condenser coil air inlet to prevent grass and foliage from ob-
structing airflow.
NOTE: Horizontal units may be installed on a roof curb if re-
quired.
ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
A non-combustible sleeper rail can be used in the unit curb
support area. If sleeper rails cannot be used, support the long
sides of the unit with a minimum of 3 equally spaced 4-in. x
4-in. (102 mm x 102 mm) pads on each side.
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition) shall
not exceed 0.35 in. wg (87 Pa) with economizer or 0.45 in. wg
(112 Pa) without economizer.
For vertical ducted applications, secure all ducts to roof curb
and building structure. Do not connect ductwork to unit.
Fabricate supply ductwork so that the cross sectional dimen-
sions are equal to or greater than the unit supply duct opening
dimensions for the first 18 in. (458 mm) of duct length from
the unit basepan.
Insulate and weatherproof all external ductwork, joints, and
roof openings with counter flashing and mastic in accordance
with applicable codes.
Ducts passing through unconditioned spaces must be insulated
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 applicable fire
codes.
A minimum clearance is not required around ductwork.
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are not re-
quired 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 2 and Fig. 7 for additional information.
Lifting holes are provided in base rails as shown in Fig. 7. Re-
fer to rigging instructions on unit.
Rigging materials under unit (cardboard to prevent base pan
damage) must be removed PRIOR to placing the unit on the
roof curb.
When using the standard side drain connection, ensure the red
plug in the alternate bottom connection is tight. Do this before
setting the unit in place. The red drain pan can be tightened
with a
1
/
2
-in. square socket drive extension. For further details
see Step 10 — Install External Condensate Trap and Line on
page 19.
Before setting the unit onto the curb, recheck gasketing on
curb.
MAXIMUM ALLOWABLE DIFFERENCE IN. (MM)
A-B
B-C
A-C
0.5” (13)
1.0” (25)
1.0” (25)
A
B
C
CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage to
roofing materials.
Membrane roofs can be cut by sharp sheet metal edges.
Be careful when placing any sheet metal parts on such
roof.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
All panels must be in place when rigging. Unit is not de-
signed for handling by fork truck when panels or pack-
aging are removed.
If using top crate as spreader bar, once unit is set, care-
fully lower wooden crate off building roof top to ground.
Ensure that no people or obstructions are below prior to
lowering the crate.
Summary of Contents for WeatherMaster 48HC07 Series
Page 6: ...6 Fig 2 Unit Dimensional Drawing Sizes 07 09 ...
Page 7: ...7 Fig 2 Unit Dimensional Drawing Sizes 07 09 cont ...
Page 8: ...8 Fig 3 Unit Dimensional Drawing Sizes 11 and 12 ...
Page 9: ...9 Fig 3 Unit Dimensional Drawing Sizes 11 and 12 cont ...
Page 26: ...26 Fig 41 Typical Humidi MiZer Adaptive Dehumidification System Humidistat Wiring ...
Page 28: ...28 Fig 43 Electro Mechanical Control Wiring Diagram ...
Page 29: ...29 Fig 44 Electro Mechanical Control Wiring Diagram with Humidi MiZer System ...
Page 30: ...30 Fig 45 Typical ComfortLink Control Wiring Diagram 48HC 08 09 shown ...
Page 32: ...32 Fig 47 Typical PremierLink Control Wiring Diagram ...
Page 33: ...33 Fig 48 Typical PremierLink Control Wiring Diagram with Humidi MiZer System Option ...
Page 34: ...34 Fig 49 Typical RTU Open Controller Wiring Diagram ...
Page 35: ...35 Fig 50 Typical RTU Open Controller Wiring Diagram with Humidi MiZer System Option ...
Page 53: ......