Lennox BCK 020 Installation Operating & Maintenance Manual page 25

INSTALLATION ON A ROOF MOUNTING FRAME
ASSEMBLY
The frame is supplied as a single package and shipped folded down for ease of transport and handling. It is easy field
assembled as all parts required are supplied with the frame.
SECURING THE FRAME
To ensure proper mating with units (figure 15), it is mandatory that the roof mounting frame be squared to roof structure as
follows:
-With frame positioned levelled in the desired location on roof trusses, tack weld corner of frame.
-Measure frame diagonally from corner to corner as shown
in figure 16. These Dimensions must be equal in order for
the fame to be square.
-It is extremely important to sight frame from all corner to
ensure it is not twisted across. Shim frame under any low
side. The maximum slope tolerance is 5mm per linear meter
in any direction.
-After the frame has been squared, straightened and
shimmed, weld or secure the frame to the roof deck.
NOTE: It must be securely fastened to the roof as per local
codes and regulations. Fig. 16
Page 24 - IOM / ROOFTOP BALTIC Series - 0803 - E