Specifications

DAKA 521FB Manual Page 11 of 32 January 2009
Rev. 3, June 2013
VIII. PLANNING YOUR INSTALLATION
B. CLEARANCES – continued
2) Wall Clearances to Combustibles
See FIG. 4.
 Furnace to sidewall: 18”
 Flue to sidewall: 27”
 Furnace to back wall: 32 ½”
 Flue to back wall: 23”
 Furnace to front wall: 48”
 Non-combustible sidewall: 6”
 Sides of DAKA furnace to primary
furnace: 9”
FIG. 4
Dimensions shown are minimum
distances to stay clear from combustible
walls.
C. CHIMNEY
1) General
Chimney Requirements:
1) Minimum 6” inside diameter
2) “Type HT” (High Temperature)-listed
appliance-type chimney or a code-complying
tile-lined masonry chimney.
3) Chimney must extend 3’ above roofline and
be at least 2’ higher than any point of roof within
10’. See FIG. 5.
DO NOT install more than two 90° degree
elbows in the flue pipe to help maintain proper
draft.
This furnace requires its own independent
chimney. DO NOT connect to a chimney flue
serving another appliance. See FIG. 6.
All horizontal runs must have a minimum
upward rise of ¼” per foot.
The chimney connector (smoke pipe leading to
chimney flue) must be of minimum 24-ga. pipe
with each section joined with three sheet metal
screws. All fissures should be sealed with
furnace cement. Do not use galvanized pipe as
the coating could melt and cause toxic fumes.
A stack thermometer is recommended. Stack
temperatures can be checked with a simple
surface-mounted or probe-type thermometer. It
is recommended to maintain normal operating
range of 300-600 ° F. Temperatures lower than
300° F indicate insufficient draft or inadequate
combustion air and may result in creosote
formation in chimney flue.
The maximum draft setting is a maximum of
.06” W.C. (measured in water column). Use of
a gauge is highly recommended. Follow gauge
manufacturer’s instructions. Gauges to
measure chimney draft are readily available at
furnace shops and are economical to purchase
or rent. If a draft gauge is not available, with
the draft regulator fully installed and a good fire
burning, adjust the counterbalance weight
closer to the gate for as low a draft setting as
possible, without the fire dying or getting
smoke-back with the stove door slightly open.
To obtain higher heat levels, move the weight
away from the gate to increase the setting.
[An optional DAKA barometric regulator #283 may be used in the
chimney connector to help increase furnace efficiency by maintaining
a consistent draft. See FIGS. 5 & 6 on page 12.]