Detroit Radiant Products Company LD3 Series - Manual (Page 44)

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LD3 Series 3.0 Installation • Verifying Manifold Pressure
14 Replace the inlet pressure tap plug on the gas control valve.
15 Leak check the re-installed pressure tap plug using a soap solution or equivalent method
as described in ANSI Z223.1 (NFPA 54).
Figure 3.29 • Gas Valve Shown in OFF Position
Verify Manifold Pressure
Before starting up the unit, smell all around the heater for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle on the floor.
When turning the gas shut off valve, only use your hand. Never use tools to turn the knobs, as it
may damage the valve resulting in a fire or explosion. If the knob is stuck, do not try to repair it,
contact a qualified service technician or your local gas company.
To verify the proper manifold pressure, follow the following steps:
1 Turn off the gas valve with the switch located on the valve body (see Figure 3.29).
2 Remove the manifold pressure tap plug on the gas control valve(see Figure 3.29).
3 Connect the pressure gauge tube and manometer.
4 Turn on the gas valve with the switch located on the valve body.
5 Turn on the electrical power to the heater.
6 To light the main burner, set the room thermostat to a point above room temperature.
NOTE: This heater is equipped with an ignition device, which automatically lights the burner.
This heater cannot be lighted manually. Do not try to light the burner by hand.
Verify manifold pressure:
7 After the unit has successfully ignited, wait five minutes prior to taking any readings. The
heater must be in a steady state of operation prior to taking a manifold pressure reading.
8 While waiting for the unit to stabilize, observe the characteristics of the flame. The flame
should be stable and should not lift from the burner. The burner color should be light blue,
and not create excessive noise.
Inlet Pressure
Port
Manifold Pressure Port
On/Off Switch
High Fire
Manifold Pressure
Adjustment Screw
Low Fire
Manifold Pressure
Adjustment Screw