OM-DH/DHT 7
Installation
absence of local codes, with the National Fuel Gas Code, ANSI Z223.1/NFPA
54 (current edition), or the Natural Gas and Propane Installation Code CSA
149.1(current edition), as applicable. Additionally following must be complied
with: THE AREA DIRECTLY AROUND THE APPLIANCE MUST BE CLEARED OF ALL
COMBUSTIBLE MATERIAL. FAILURE TO FOLLOW THESE INSTRUCTIONS CAN CAUSE
BODILY INJURY AND /OR PROPERTY DAMAGE. The appliance and its individual
shut-off valve must be disconnected from the gas supply piping system during any
testing at pressures in excess of ½ PSI (3.45 kPa). The appliance must be isolated
from the gas supply piping system by closing its individual manual shut-off valve
during any pressure testing at or less than ½ PSI (3.45 kPa).
10. Confirm that the jacket water level is between the gauge glass markers or inside
the sight glass port. If the level is low, follow instructions under “Jacket Filling and
Water Treatment,” Page 16.
11. The open end of the elbow on the outlet of the safety valve must face downward. If
it does not, turn it to the correct position.
12. For units with optional tangent drawoff: Assemble the tangent draw-off by placing
the large nut over the draw-off valve and inserting it into the draw-off tube. ONLY
HAND-TIGHTEN THE NUT to complete installation.
WARNING
DO NOT CONNECT ANY PIPING TO THE
PRESSURE RELIEF VALVE. THE VALVE MUST
BE FREE TO VENT STEAM AS NEEDED.
IMPROPER INSTALLATION WILL VOID THE
WARRANTY! THE ELBOW ATTACHED TO
THE PRESSURE RELIEF VALVE MUST
POINT TO THE FLOOR.
The open end of the pressure
relief valve elbow must face downward
When attaching the draw-off
valve, hand-tighten the nut
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