362247-BIM-B-0109
50 Johnson Controls Unitary Products
START-UP (GAS HEAT)
PRE-START CHECK LIST
Complete the following checks before starting the unit.
1. Check the type of gas being supplied. Be sure that
it is the same as listed on the unit nameplate.
2. Make sure that the vent and combustion air hoods
have been properly installed.
OPERATING INSTRUCTIONS
TO LIGHT PILOT AND MAIN BURNERS:
1. Turn “off” electric power to unit.
2. Turn room thermostat to lowest setting.
3. Turn gas valve knob or switch to “on” position.
4. Turn “on” electric power to unit.
5. Set room thermostat to desired temperature. (If
thermostat “set” temperature is above room tem-
perature, pilot burner ignition will occur and, after
an interval to prove pilot flame, main burners will
ignite).
TO SHUT DOWN:
1. Turn “off” electric power to unit.
2. Depress knob of gas valve while turning to “off”
position or position the switch to the “off” position.
POST-START CHECK LIST (GAS)
After the entire control circuit has been energized and
the heating section is operating, make the following
checks:
1. Check for gas leaks in the unit piping as well as the
supply piping.
2. Check for correct manifold gas pressures. See
“Checking Gas Input” on page 52.
3. Check the supply gas pressure. It must be within the
limits shown on rating nameplate. Supply pressure
should be checked with all gas appliances in the
building at full fire. At no time should the standby
gas line pressure exceed 13", nor the operating
pressure drop below 5.0" for natural gas units. If gas
pressure is outside these limits, contact the local
gas utility for corrective action.
This furnace is equipped with an intermittent
pilot and automatic re-ignition system. DO
NOT attempt to manually light the pilot.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly
could result in serious injury, death or property
damage.
Never test for gas leaks with an open flame.
use a commercially available soap solution
made specifically for the detection of leaks to
check all connections. A fire or explosion may
result causing property damage, personal
injury or loss of life.
FIGURE 19 - TYPICAL SINGLE STAGE GAS VALVES
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