68
Table 20 – Altitude Derate Multiplier for U.S.A.
ALTITUDE
PERCENT
OF
DERATE
DERATE
MULTIPLIER
FACTOR*
FT.
M
0–2000
0-610
0
1.00
2001–3000
610-914
4-6
0.95
3001–4000
914-1219
6-8
0.93
4001–5000
1219-1524
8-10
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 multiplier factors are based on midpoint 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
PG92S*S