MAIN PIPING CONNECTIONS
!WARNING
Failure to turn off electric or main gas supply to heating system could cause personal injury and/ or property damage by shock, gas suffocation, fire, and/or explosion.
1.Turn off electrical power to the system at the fuse box or circuit breaker. Also turn off the main gas supply.
2.If replacing an existing valve, disconnect all plumbing and electrical connections from the old control.
3.The control may be installed in any orientation except upside down. The arrow on the valve indicates the direction of gas flow through the control.
4.You should use new pipe that is properly chamfered, reamed, and free of burrs and chips. If you are using old pipe, be sure it is clean and free of rust, scale, burrs, chips, and old pipe joint compound.
5.Apply pipe joint compound (pipe dope) or teflon tape that is approved for all gases, only to the male threads of the pipe joints. DO NOT apply com- pound or teflon tape to the first two threads (see fig. 1 for typical piping connections).
6.If you are using a vise or
7.See SYSTEM WIRING when making electrical con- nections. After all gas and electrical connections are completed, turn gas on and check for gas leaks with leak detection solution or soap suds. Bubbles forming indicate a leak. SHUT OFF GAS AND FIX ALL
LEAKS IMMEDIATELY.
NOTE
All piping must comply with local codes, ordinances, and/or national fuel gas codes.
INSTALLATION
SYSTEM WIRING
!CAUTION
To prevent electrical shock and/or equipment damage, disconnect electrical power to system at main fuse or circuit breaker box until installation is complete.
NOTE
All wiring should be installed in accordance with local and national electrical codes and ordinances.
Always check that the electrical power supply used agrees with the voltage and frequency shown on the gas control.
These typical wiring diagrams (figs. 2 and 3) show only the terminal identification and wiring hook up. Always refer to wiring instructions provided by equipment manufacturer for system
High | Thermostat | |
Limit | ||
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| Gas Valve |
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| Terminal Panel |
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| TR |
ALL WIRING | TH | To Pilot |
MUST BE | Generator | |
N.E.C. CLASS 1 |
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Figure 2. Wiring for 36C21U | ||
High |
| Automatic |
Limit Thermostat | Pilot | |
24 VAC | 36C21 |
Valve |
Gas
Valve
NOTE: ALWAYS INCLUDE A DRIP LEG IN PIPING
Drop
Horizontal
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| Gas Valve | ||||||
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minimum |
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Figure 3. Wiring for 36C21 and 36C21A Models
Drop
Gas Valve | Horizontal |
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Riser
3 in. | 3 in. |
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| Gas Valve |
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minimum | minimum |
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Piped Gas | Piped Gas | Tubing Gas |
Supply | Supply | Supply |
| Figure 1. Typical gas valve piping |
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