37
DST
Series
3.0
Installation
•
Verifying Manifold Pressure
13
While waiting for the heater 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.
14
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:
15
Set thermostat or other control device to the lowest set point.
16
After heater has completed the post-purge cycle, turn off the electrical power to the unit
heater.
17
Turn off the gas valve with the switch located on the valve body (see Figure 3.20).
18
Remove the pressure gauge tube and the manometer.
19
Replace the manifold pressure tap plug on the gas control valve.
20
Leak check the re-installed pressure tap plug using a soap solution or equivalent method
as described in ANSI Z223.1 (NFPA 54).
Verify
maximum
inlet gas supply pressure:
9
Turn off all other gas appliances on the same supply line.
10
Observe the pressure reading on the pressure gauge.
The maximum inlet gas supply pressure for:
• Natural gas is 14.0 inches W.C.
• Propane gas is 14.0 inches W.C.
IMPORTANT:
If the inlet gas supply pressure is not within the minimum and maximum
range as shown on the rating plate, contact your gas supplier.
Removing pressure gauge from inlet port on gas valve.
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 heater.
12
Turn off the gas supply at the manual gas shut off valve.