GAS PIPE SIZING
Heater Size
Distance from the Meter
0 to 15 m
16 to 30 m
31 to 60 m
200
25 mm
32 mm
32 mm
300
32 mm
32 mm
40 mm
400
32 mm
40 mm
50 mm
SEDIMENT TRAP/DRIP LEG
Install a sediment trap/drip leg and
union located outside the heater panels
in accordance with National code
requirements. Do not use a restrictive gas
cock. The sediment trap/drip leg shall be
either a tee fitting with a capped nipple in
the bottom outlet which can be removed
for cleaning, as illustrated in Figure 6, or
an other device recognized as an effective
sediment trap/drip leg. All gas piping should
be tested after installation in accordance
with local codes.
TESTING GAS LEAKS AND GAS PRESSURE
Before operating the heater, the heater and its gas connections must be leak tested. Do NOT
use an open flame to test for leaks. Test all gas connections for leaks with soapy water.
The gas valve must be completely disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of 6.0 kPa (.87 psig).
TESTING THE GAS PRESSURE THROUGH THE COMBINATION GAS CONTROL VALVE
Risk of fire and explosion. Alteration, service, or maintenance of the Combination Gas
Control Valve can lead to fire or explosion, causing loss of life, personal injury, and/or
property damage. DO NOT ATTEMPT TO ADJUST THE GAS CONTROL VALVE.
!
WARNING
These instructions are for the use of qualified service technicians only!
1. Shut off the gas supply to the heater.
2. Loosen the small screw inside the pressure tap as shown in Figure 7.
3. Connect the manometer hose.
4. Open the gas supply to the heater.
5. Turn on the heater.
6. Take the gas pressure reading.
7. Turn off the heater.
Table 2.
Figure 6.
