Installation
RT-SVX23M-EN
21
Roof Curb
The roof curbs for these units consists of a "full perimeter"
enclosure to support the unit just inside of the unit base
rail. The WSC120E, W/DHC120H unit contains a support
base alignment rail and will extend past the end of the roof
curb as shown in figures below.
Before installing any roof curb, verify;
•
It is the correct curb for the unit,
•
The necessary gaskets and hardware are included,
•
The purposed installation location provides the
required clearance for proper operation.
•
Insure that the curb is level and square. The top surface
of the curb must be true to assure an adequate curb-to-
unit seal.
Verify that appropriate materials were used in the
construction of roof and ductwork. Combustible materials
should not be used in the construction of ductwork or roof
curb that is in close proximity to heater elements or any
hot surface. Any combustible material on the inside of the
unit base should be removed and replaced with
appropriate material.
Step-by-step curb assembly and installation instructions
ship with each accessory roof curb kit. Follow the
instructions carefully to assure proper fit-up when the unit
is set into place.
Note:
To assure proper condensate flow during
operation, as well as proper operation of the
condensate overflow switch (if equipped), the unit
and curb must be level.
If the unit is elevated, a field constructed catwalk around
the unit is strongly recommended to provide easy access
for unit maintenance and service.
Recommendations for installing the Supply Air and Return
Air ductwork joining the roof curb are included in the curb
instruction booklet. Curb ductwork must be fabricated and
installed by the installing contractor before the unit is set
into place.
Note:
For sound consideration, cut only the holes in the
roof deck for the ductwork penetrations. Do not cut
out the entire roof deck within the curb perimeter.
Figure 29. Heat pumps - 5 to 10 tons standard efficiency,
4 to 5 ton high efficiency - downflow airflow
supply/return - through-the-base utilities
Figure 30. Heat pump - 10 tons high efficiency -
downflow airflow supply/return through-the-
base utilities
3 5/8”
92 MM
17 1/2”
444 MM
4”
102 MM
9 7/8”
251 MM
17 1/2”
444 MM
32 1/8”
816 MM
RETURN
SUPPLY
33”
838 MM
4 1/8”
104 MM
27 5/8”
701 MM
THROUGH THE
BASE CONDENSATE
40 3/4”
1035 MM
THROUGH THE
BASE ELECTRICAL
5 7/8”
149 MM
5”
127 MM
10 7/8”
276 MM
3 3/4”
95 MM
2 3/4”
71 MM
6 1/2”
165 MM
RETURN
RETURN
SUPPLY
SUPPLY
3 5/8”
3 5/8”
92 MM
92 MM
17 1/2”
17 1/2”
444 MM
444 MM
9 7/8”
9 7/8”
251 MM
251 MM
17 1/2”
17 1/2”
444 MM
444 MM
32 1/8”
32 1/8”
816 MM
816 MM
33”
33”
838 MM
838 MM
4”
4”
102 MM
102 MM
THROUGH THE
THROUGH THE
BASE ELECTRICAL
BASE ELECTRICAL
THROUGH THE
THROUGH THE
BASE CONDENSATE
BASE CONDENSATE
4 5/8”
4 5/8”
119 MM
119 MM
THROUGH THE
THROUGH THE
BASE GAS
BASE GAS
5 7/8”
5 7/8”
149 MM
149 MM
27 5/8”
27 5/8”
701 MM
701 MM
42 3/16”
42 3/16”
1072 MM
1072 MM
6 3/8”
6 3/8”
163 MM
163 MM
2 3/4”
2 3/4”
71 MM
71 MM
51 3/16”
51 3/16”
1316 MM
1316 MM
4 1/8”
4 1/8”
104 MM
104 MM
WARNING
Combustible Materials!
Failure to maintain proper clearance between the unit
heat exchanger, vent surfaces and combustible
materials could cause a fire which could result in death
or serious injury or property damage. Refer to unit
nameplate and installation instructions for proper
clearances.
Figure 31.
View for base to roof curb alignment
WSC120E, W/DHC120H on 50 x 84 roof curb
Base Alignment Bracket
Содержание Precedent WSC072E
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