Lanair DHI 300 - Manual (Page 13)

Section 3 - Chimney/Vent System
Visit our website at: www.lanair.com
13
General Requirements (cont.)
4. Install a U.L. listed barometric damper in the chim-
ney. Do not reduce or enlarge the vent pipe.
5. Each 90° elbow equals a 10’ run of chimney. The
maximum run for the chimney connector is 30’ (See
illustrations on pp. 12 & 14).
6. To prevent the drawing of exhaust gases into the
building, keep the barometric draft control at least
24” from the heater, exhaust fan etc..
7. Position the draft control as shown. Barometric
Damper gate pins must be horizontal (Level or
parallel to the floor) for proper operation.
8. Secure all connections in the chimney connector with 3 screws per joint.
9. The chimney connector clearance to any combustible material is 18”. The “Class A”
chimney clearance to any combustible is 2”. Follow the chimney manufacturer’s instruc-
tions.
10. Do not install heat re-claimers, manual draft controls, or any other type of restrictive
control in the chimney.
11. Install clean out tee with a cap, at the transition of the chimney. FOLLOW CHIMNEY
MANUFACTURERS INSTRUCTIONS.
12. Use “Class A” insulated chimney pipe to vent exhaust gases through wall, ceilings, attics,
roofs, combustibles, etc. Class A chimney must be used for the entire run once passing
through a wall of ceiling.
13. Vent chimney at least 3 feet above the roof and at least 3 feet higher than any portion
of the building, roof, or obstruction within 10 feet of the chimney.
14. The chimney cap should be at least 3’ above the chimney exit through the roof.
15. Do not use a rotating chimney cap. Use a non-restrictive “Class A” cap made for the type
“Class A” chimney you are using. Follow chimney manufacturer’s instruction.
16. The chimney must be capable of producing a negative -.02 W.C. draft when cold and -
.06 W.C. draft when hot. Refer to Section 5 Draft Instructions. Refer to Section 3.10 for
typical Chimney Installation.
HORIZONTAL
VERTICAL
NOTE: Barometric Damper may
be mounted horizontally or
vertically. Angle gate pins
must be horizontal (level or
parallel to floor) for proper
operation.
Barometric Damper Position
Section 13 - Service / Maintenance
QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST
40
Air Pre-Heater Diaphragm
Replacement
1. Remove the four hex cap screws
from the diaphragm assembly and
discard.
2. Disassemble and discard diaphragm,
spring and o-ring .
3. Thoroughly clean remaining parts.
4. Re-assemble using new diaphragm,
o-ring, spring and hex cap screws.
Air Pre-Heater Nozzle Cleaning /
Replacement
1. Periodic cleaning of the nozzle
assembly may be required.
2. Carefully remove nozzle from the air
pre-heater block.
3. Disassemble the nozzle as shown
and clean thoroughly. Re-assemble
nozzle.
4. Carefully remove the quad ring from
the block and inspect. Replace if nec-
essary.
5. Insert clean/new quad ring into the
air pre-heater block. NOTE: The quad
ring must be properly seated.
Failure to properly seat the quad
ring may result in leakage and
improper burner operation. DO NOT
INSTALL QUAD RING ON THE NOZ-
ZLE.
6. Lubricate pin/seat and re-install noz-
zle. Tighten securely.
! Failure to properly seat the quad
ring may result in leakage and
improper burner operation. DO
NOT INSTALL QUAD RING ON
THE NOZZLE.
Air Pre-Heater Diaphragm Assembly
Air Pre-Heater Nozzle Assembly
Proper Quad Ring Position
diaphragm
fuel orifice
body
pin/seat
nozzle assembly
quad ring
piston
spring
hex cap
screws
o-ring
!
DO NOT INSTALL CHIMNEY IN FRONT OF
THE HEATER (in air stream of fan)