Set Temperature Rise - Bryant 355MAV Installation, Start-Up, And Operating Instructions Manual

m. Move setup switch SW-2 to OFF position and jumper R and W2 thermostat connections. (See Fig. 31.) This keeps furnace locked in
high-heat operation. Repeat items h through k for high-heat operation.
EXAMPLE: (High-heat operation at 0-2000 ft altitude)
Furnace input from rating plate is 100,000 Btuh.
Btu heating input = Btu/cu ft X cu ft/hr
Heating value of gas = 975 Btu/cu ft
Time for 1 revolution of 2-cu ft dial = 70 sec
Gas rate = 103 cu ft/hr (from Table 15)
Btu heating input = 103 X 975 = 100,425 Btuh. In this example, the orifice size and manifold pressure adjustment is within ±2 percent of
the furnace input rate.
NOTE: Measured gas inputs (high heat and low heat) must be within ±2 percent of that stated on furnace rating plate when installed at sea level
or derated per that stated above when installed at higher altitudes.
n. Remove jumper across R, W/W1, and W2 thermostat connections to terminate call for heat.
B. Set Temperature Rise
CAUTION: Temperature rise must be within limits specified on unit rating plate. Recommended operation is at
midpoint of rise or above. Failure to follow this caution may result in overheating the heat exchangers or condensing flue
gases in heat exchanger areas not designed for condensate.
ON/OFF
SWITCH
INLET
PRESSURE
TAP
BURNER
ENCLOSURE
REFERENCE
PRESSURE TAP MANIFOLD
PRESSURE
TAP
Fig. 56—Redundant Automatic Gas Valve
Fig. 57—Burner Orifice
—55—
LOW-FIRE
ADJUSTMENT
ALLEN SCREW
(UNDER CAP)
HIGH-FIRE
ADJUSTMENT
ALLEN SCREW
(UNDER CAP)
BURNER
ORIFICE
A97386
A93059