COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 9: GAS PIPING
WARNING
Fire Hazard
Connect gas supply according to Figure 9.
Gas can leak if not installed properly.
Failure to follow these instructions can result in death, injury or property damage.
It is important that the gas supply pipe and the electrical connections do not support any of the heater’s weight.
9.1 Connections
Connect the heater to the gas supply ensuring that the final connections are as follows:
•Gas supply pipe work is run in medium or heavy gauge tubing in compliance with local and national codes.
•The gas supply pipe is adequately sized to carry the total volume of gas for the complete installation.
•An isolating valve and union connection should be used and fitted into the supply adjacent to the heater.
•For suspended heaters, use an approved metal flexible connection between the isolating valve and the heater. To reduce pressure loss, use one pipe size larger than the heater gas connection.
A gas meter is connected to the service pipe by the gas supply company. An existing meter should be checked, preferably by the company, to ensure that the meter is adequate for the rate of gas supply required.
Installation pipes must be fitted in accordance with local and national codes. Pipe work from the meter to the heater(s) must be of adequate size. Pipes of smaller size than the heater inlet gas connection should not be used.
IMPORTANT - The complete installation must be purged and tested for gas soundness in accordance with local and national codes.
Figure 9: Gas Connection with Stainless Steel Flex Connector
•Hold gas nipple securely with pipe wrench when attaching the flex gas connector.
•Do not twist flexible gas connector.
•Ensure all joints are gas tight.
Do not bend flexible gas connector sharply.
Option A:
Stainless Steel
Flex Gas
Connector
| Option B: |
Gas Isolating Valve | Medium or Heavy |
Gauge Tubing | |
| Gas Connector |
| Drip Leg |
Union | Cap |
Connection |
|
14
