Orifice - Garland HEEGM48CL Service Manual

6 COMPONENTS
5. Remove the valve from the manifold by spinning the valve counter-clockwise.
i
DO NOT spin by the valve stem. Use a wrench on the valve body.
6. Remove the orifice and install it on the new gas valve using suitable pipe sealant.
7. Reassemble with the new gas valve in reverse order.
8. WARNING: Check for gas leak.

6.7 Orifice

6.7.1 Orifice Sizes:
• Natural Gas = 1.8mm
• Propane Gas = #57
6.7.2 Inspecting an Orifice
• Replace an orifice if it is cracked.
• Use a pin gauge to check the size of the hole. Replace the orifice if its hole is abnormally large
or small.
• If the orifice hole is blocked, you need to remove, clean, and re-install the orifice.
6.7.3 Replacing an Orifice:
DANGER
Turn off gas supply and remove main power supply to the unit.
WARNING
Test for gas leaks before returning the equipment into service.
To replace an orifice:
1. DANGER: Turn off gas supply and remove main power supply to the unit.
2. Remove burner (see "6.5.2 Removing, Installing Burners and Radiants").
3. From the inside of the combustion chamber, put a ½" socket on the orifice (end of gas valve)
and loosen it enough to remove.
4. Apply suitable pipe sealant and install a new orifice.
(CONT.)
Page 23 | HEEGM Service Manual part# 4532502 (Rev 0)