INST 318 HINRG HEATER – V01-18
FITMENT OF PRESSURE RELIEF VALVE
Order Replacement Header with Pressure Relief Valve port, Part Number 78660PRV
Have an authorised service technician replace the header 78660 with 78660PRV. Refer to page 25 of service
instructions “REPLACEMENT OF INLET/OUTLET HEADER”.
Locate Pressure Relief port at the outlet of the header. Fit a pressure relief valve complying with AS1271 and having
a total steam discharge capacity, in kilograms/hour, not less than the value listed in the table below.
TESTING GAS PRESSURE
1. Note – gas pressure must be measured when unit is operating.
2. Set thermostat to “OFF”.
3. Remove screws from front thermostat panel and open.
4. Loosen screw from ⅛” brass test point located on outlet side of gas valve (between the valve and the burner).
5. Connect manometer tube to test point.
6. Set thermostat to “ON” and wait for burner to ignite.
7. Once burner has ignited, the manometer must indicate the nominal inlet pressure listed below.
8. Remove the regulator cap on the gas valve and adjust the regulator pressure to achieve the specified burner operating pressure.
9. If the regulator cannot be adjusted to achieve the specified burner pressure, it is likely the gas line to the appliance is
insufficient.
10. Remove manometer.
11. Tighten test point screw.
12. Replace regulator cap.
13. Refit covers.
Important to check that Test point screw has been refitted and tightened.
To Next Page
Loading...
