TM 3-4230-237-10
0004 00
Table 1. OPERATOR'S CONTROLS AND INDICATORS - Continued
WATER PRESSURE
WATER TEMPERATURE
FUEL PRESSURE
W
ER
AR
LD
ME
CO
R
1
THERMOSTAT
SYSTEM
CIRCUIT
BREAKER
HEATER
ON
2
OFF
Key
Control or Indicator
Function
Water Heater Control Panel
Indicates the pressure of the water being circulated through the boiler.
WATER PRESSURE gage
1
Normal pressure indications are 60-120 psi. When the pressure
exceeds 200 psi, the pressure relief valve (safety valve) on the boiler
opens and relieves excess pressure.
80
60
100
40
120
140
160
0
WATER P RESS URE
Indicates pressure of the fuel supply. Fuel pressure is normally 150
FUEL PRESSURE gage
2
psi.
150
200
100
250
50
300
0
FUEL P RESS URE
0004 00-10
