Detroit Radiant Products Company UH Series - Manual (Page 40)

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UH Series
8 While waiting for the unit to stabilize, observe the characteristics of the flame. The flame
should be stable and should not lift from any burner. The burner color should be light blue,
and not create excessive noise.
9 After five minutes, observe the pressure rating on the pressure gauge.
The target manifold gas supply pressure for:
• Natural gas is 3.5 inches W.C.
• Propane gas is 10.0 inches W.C.
NOTE: Manifold pressure of the heater is pre-set at the factory. No adjustment should be
necessary.
During the verification process, a tolerance of +/- 5% of the full scale is acceptable due to varying
atmospheric conditions.
If manifold pressure is outside of this tolerance, then an adjustment may be necessary.
Removing pressure gauge from manifold port on gas valve:
10 Set thermostat or other control device to the lowest set point.
11 After heater has completed the post-purge cycle, turn off the electrical power to the unit
heater.
12 Turn off the gas valve with the switch located on the valve body (see Figure 3.15).
13 Remove the pressure gauge tube and the manometer.
14 Replace the manifold 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).
Prior to leaving the Job Site
Prior to leaving the job site, verify that:
9 Service access door is properly secured to the unit with the sight glass aligned with the
burner side.
9 The heater is clear of any objects that would interfere with the proper air circulation or that
violate the listed clearance to combustibles.
9 Air directional louvers are adjusted for desired air flow and are not shut or adjusted beyond
60° from perpendicular to the face of the unit.
9 Manual gas shut off is ON.
9 Electrical power is ON.
9 Thermostat is set to desired temperature.
9 Properly dispose of all packaging materials.
9 Check to be sure you have all of your tools.
9 Leave the Installation, Operation, Maintenance and Parts Manual with the owner or end user.
3.0 Installation • Prior to Leaving the Job Site