4. Flame-Proving-When burner flame is proved at the flame-
proving sensor electrode FSE, the inducer motor IDM
switches to low-speed unless running at high-speed, and the
furnace control CPU begins the blower-ON delay period
and continues to hold the gas valve GV-M open. If the
burner flame is not proved within two seconds, the control
CPU will close the gas valve GV-M, and the control CPU
will repeat the ignition sequence for up to three more
Trials-For-Ignition before going to Ignition-Lockout. Lock-
out will be reset automatically after three hours, by
momentarily interrupting 115 vac power to the furnace, or
by interrupting 24 vac power at SEC1 or SEC2 to the
furnace control CPU (not at W/W1, G, R, etc.).
If flame is proved when flame should not be present, the
furnace control CPU will lock out of Gas-Heating mode and
operate the inducer motor IDM on high speed until flame is
no longer proved.
5. Blower-On Delay-If burner flame is proven the blower
motor BLWM is energized 66 sec after gas valve GV-M is
opened.
Low-heat-The blower motor BLWM is energized at LO
HEAT speed.
Hi-heat-The BLWM is energized at HI HEAT speed.
Simultaneously, the electronic air cleaner terminal EAC-1
is energized and remains energized as long as the blower
motor BLWM is energized.
TABLE 10—MODEL 352MAV ORIFICE SIZE AND HIGH/LOW-HEAT MANIFOLD PRESSURE FOR CORRECT INPUT (CONT.)
FOR USE WITH 060 THROUGH 120 SIZE FURNACES ONLY
(TABULATED DATA BASED ON 20,000/13,000 BTUH PER BURNER, DERATED 2 PERCENT FOR EACH 1000 FT ABOVE SEA
LEVEL)*
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
U.S.A. and Canada
4001
to
5000
9%
derate
725 43 3.7/1.5 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.4
750 44 3.4/1.4 43 3.5/1.5 43 3.7/1.5 43 3.8/1.6 42 3.2/1.4
775 44 3.7/1.6 44 3.8/1.6 43 3.4/1.4 43 3.5/1.5 43 3.7/1.5
800 44 3.51.5 44 3.6/1.5 44 3.7/1.6 44 3.8/1.6 43 3.4/1.4
825 44 3.2/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5 44 3.7/1.6
850 45 3.5/1.5 45 3.8/1.6 44 3.3/1.4 44 3.4/1.4 44 3.5/1.5
875 45 3.3/1.4 45 3.6/1.5 45 3.7/1.6 44 3.2/1.3 44 3.3/1.4
900 45 3.3/1.4 45 3.4/1.4 45 3.5/1.5 45 3.6/1.5 45 3.8/1.6
925 47 3.7/1.6 45 3.2/1.4 45 3.3/1.4 45 3.4/1.5 45 3.6/1.5
950 47 3.5/1.5 47 3.6/1.5 45 3.2/1.3 45 3.3/1.4 45 3.4/1.4
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
U.S.A. and Canada
5001
to
6000
11%
derate
700 43 3.6/1.5 43 3.7/1.6 42 3.2/1.3 42 3.3/1.4 42 3.4/1.4
725 43 3.4/1.4 43 3.5/1.5 43 3.6/1.5 43 3.7/1.6 43 3.8/1.6
750 44 3.6/1.5 44 3.7/1.6 43 3.4/1.4 43 3.5/1.5 43 3.6/1.5
775 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5 44 3.7/1.6 43 3.4/1.4
800 44 3.2/1.3 44 3.3/1.5 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5
825 45 3.6/1.5 45 3.7/1.6 44 3.2/1.4 44 3.3/1.4 44 3.4/1.4
850 45 3.4/1.4 45 3.5/1.5 45 3.6/1.5 45 3.8/1.6 44 3.2/1.4
875 45 3.2/1.4 45 3.3/1.4 45 3.4/1.5 45 3.6/1.5 45 3.7/1.5
900 47 3.6/1.5 47 3.7/1.6 45 3.3/1.4 45 3.4/1.4 45 3.5/1.5
925 47 3.4/1.4 47 3.5/1.5 47 3.7/1.5 45 3.2/1.3 45 3.3/1.4
950 48 3.7/1.6 48 3.8/1.6 47 3.5/1.5 47 3.6/1.5 47 3.7/1.6
975 48 3.5/1.5 48 3.6/1.5 48 3.8/1.6 47 3.4/1.4 47 3.5/1.5
1000 48 3.3/1.4 48 3.5/1.5 48 3.6/1.5 48 3.7/1.6 48 3.8/1.6
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
U.S.A. Only
6001
to
7000
13%
derate
650 42 3.2/1.3 42 3.3/1.4 42 3.4/1.4 42 3.5/1.5 42 3.6/1.6
675 43 3.6/1.5 43 3.7/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4
700 44 3.8/1.6 43 3.4/1.5 43 3.6/1.5 43 3.7/1.6 43 3.8/1.6
725 44 3.6/1.5 44 3.7/1.6 44 3.8/1.6 43 3.4/1.4 43 3.5/1.5
750 44 3.3/1.4 44 3.4/1.5 44 3.6/1.5 44 3.7/1.6 44 3.8/1.6
775 45 3.8/1.6 44 3.2/1.4 44 3.3/1.4 44 3.4/1.5 44 3.5/1.5
800 45 3.5/1.5 45 3.7/1.5 45 3.8/1.6 44 3.2/1.4 44 3.3/1.4
825 45 3.3/1.4 45 3.4/1.5 45 3.6/1.5 45 3.7/1.6 45 3.8/1.6
850 47 3.7/1.6 45 3.2/1.4 45 3.4/1.4 45 3.5/1.5 45 3.6/1.5
875 47 3.5/1.5 47 3.6/1.5 45 3.2/1.3 45 3.3/1.4 45 3.4/1.4
* Orifice numbers shown in shading are factory installed.
NOTE: Percents of derate are based on midpoints of U.S. altitude ranges.
—42—
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