Bryant 912SC - Altitude Derate Multiplier for U.S.A

68
Table 20 – Altitude Derate Multiplier for U.S.A.
ALTITUDE
PERCENT
OF
DERATE
DERATE
MULTIPLIER
FACTOR*
FT. M
0–2000 0 --- 6 1 0 0 1.00
2001–3000 610--- 914 4 --- 6 0.95
3001–4000 914--- 1219 6 --- 8 0.93
4001–5000 1219--- 1524 8 --- 1 0 0.91
5001–6000 1524--- 1829 10--- 12 0.89
6001–7000 1829--- 2134 12--- 14 0.87
7001–8000 2134---2438 14--- 16 0.85
8001–9000 2438---2743 16--- 18 0.83
9001–10,000 2743--- 3048 18--- 20 0.81
*Derate mul tiplier f actors are based on midpoin t altitude for altitude range.
ON/OFF Switch
Regulator Seal Cap
Regulator Adjustment
Regulator Seal Cap under Cap
1/2” NPT Outlet
1/8” NPT Manifold
Pressure Tap
1/8” NPT Inlet
Pressure Tap
1/2” NPT Inlet
SINGLE-STAGE
Representative drawing only, some models may vary in appearance.
A11153
Fig. 60 -- Gas Valve without Tower Pressure Ports
ON/OFF SWITCH
1/8” NPT INLET
PRESSURE TAP
REGULATOR SEAL CAP
(REGULATOR ADJ.
UNDER CAP)
1/2” NPT
OUTLET
MANIFOLD PRESSURE TAP
SET SCREW: 3/32” HEX HEAD
ACCEPTS 5/16” HOSE CONNECTION
OUTP
INP
VENT
1/2” NPT
INLET
INLET PRESSURE
TAP SET SCREW:
3/32” HEX HEAD
ACCEPTS 5/16”
HOSE CONNECTION
Representative drawing only, some models may vary in appearance.
A170118
Fig. 61 -- Gas Valve with Tower Pressure Ports
BURNER
ORIFICE
A93059
Fig. 62 -- Orifice Hole
R Y W G
10 TURNS
THERMOSTAT SUBBASE
TERMINALS WITH
THERMOSTAT REMOVED
(ANITICIPATOR, CLOCK, ETC.,
MUST BE OUT OF CIRCUIT.)
HOOK-AROUND
AMMETER
EXAMPLE:
5.0 AMPS ON AMMETER
10 TURNS AROUND JAWS
=
0.5 AMPS FOR THERMOSTAT
ANTICIPATOR SETTING
FROM UNIT 24-V
CONTROL TERMINALS
A96316
Fig. 63 -- Amp. Draw Check with Ammeter
912S