6
B. Roof Preparation
1. FIRE OR ELECTRICAL SHOCK
HAZARD. Make sure there are no obstacles
(wires, pipes, etc.) inside RV’s [roof / oor /
walls]. Shut OFF gas supply, disconnect 220-
240 Vac power from RV, and disconnect posi-
tive (+) 12 Vdc terminal from supply battery BE-
FORE drilling or cutting into RV. Failure to obey
these warnings could result in death or serious
injury.
Opening Requirements - Before preparing
the ceiling opening, the type of system op-
tions MUST be decided upon. Read all of
the following instructions before beginning
the installation.
2. Carefully mark and cut the required roof opening.
See "B. Roof Requirements" on page (4).
3. Using the roof opening as a guide, cut the match-
ing hole in the ceiling.
4. Maintain structural integrity. Oth-
erwise damage to product and/or RV could oc-
cur.
NEVER create a low spot on RV
roof. Otherwise, water will pool and could cause
a leak.
The opening created must be framed to provide
adequate support and prevent air from being
drawn from the roof cavity. Framing stock 407
mm or more in thickness must be used. Remem-
ber to provide an entrance hole for power sup-
plies, indoor temperature sensor (if applicable),
thermostat communication cable, and furnace
wires (if applicable) at the front of the opening.
See (FIG. 4).
3/4″ Min.
Leave Access For
Power Supply Wiring
FIG. 4
381 mm
Min. At
Front Of
Opening
Do Not Cut Roof
Structure Or
Rafters
Good-Rafters
Supported By
Cross Beams
Good Location
Between Roof
Rafters
Frame Opening So It
Won't Collapse When
Bolting Down Unit
19 mm Min.
C. Air Distribution Duct Sizing & Design
The installer of this system must design the air distribution
system for their particular application. Several requirements
must be met for the unit to operate properly. These require-
ments are as follows:
1. Make sure ductwork will NOT
bend or collapse during and after installation,
and that it is correctly insulated and sealed.
Otherwise, damage to roof structure and ceiling
could occur.
2. All discharge air ducts must be properly insu-
lated to prevent condensation from forming on
their surfaces or adjacent surfaces during op-
eration of unit. This insulation must be R-7 mini-
mum. See (FIG. 5).
INSTALLATION INSTRUCTIONS
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