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3. Fusible Links
The fusible link is designed to separate at a specific temperature, releasing tension from the fusible link line, causing system actuation. See Figure 2-11
After determining the maximum ambient temperature at the fusible link location, select the correct fusible link according to the temperature condition chart below:
| Fusible Link Model No. | Maximum Ambient Temperature | Part Number |
| FL-165 | 950 F (350 C) | 550368 |
| FL-212 | 1420 F (610 C) | 550365 |
| FL-280 | 2100 F (990 C) | 550366 |
| FL-360 | 2900 F (1430 C) | 550009 |
| FL-450 | 3800 F (1930 C) | 550367 |
| FL-500 | 4300 F (2210 C) | 56816 |
4. Thermal Detectors
Fixed temperature thermal detectors are normally open, mechanical contact closure switches designed to operate at a factory preset temperature. They are available in four preset temperatures which meet NFPA standards and are UL Listed and FM Approved. After determining the maximum ambient temperature at the thermal detector location, select the correct thermal detector according to the temperature condition chart below:
| Thermal Detector Model No. | Maximum Ambient Temperature | Part Number |
| TD-225 | 1550 F (680 C) | 13976 |
| TD-325 | 2550 F (1240 C) | 13975 |
| TD-450 | 3800 F (1930 C) | 13974 |
| TD-600 | 5300 F (2770 C) | 13971 |
MODEL RPS-M - REMOTE MECHANICAL PULL STATION (P/N 551074)
Remote manual control for the Model MCH3, NMCH3, or ECH3 control head is provided by the model RPS-M remote mechanical pull station. It is connected to the system control head by stainless steel cable. This cable is enclosed in 1/2 in. (1.3 cm) EMT with corner pulleys at each charge in direction. The remote mechanical pull station shall be located at the point of egress. See Fig 2-12.
GAS SHUTOFF VALVES
1. Mechanical Gas Shutoff Valve.
A gas shutoff valve is required on all systems used to protect a gas fueled cooking appliance to stop gas flow in the event of system actuation. A mechanical gas valve can be used with the Model MCH3 control head. It is connected to the system control head by stainless steel cable. This cable is enclosed in 1/2 in. (1.3 cm) EMT with a corner pulley at each change in direction. The valves are rated for natural and LP gas (see Figure 2-13). Mechanical gas valves are available in the following sizes:
| Model No. | Valve Size | Maximum Operating Pressure | Part Number |
| GV-75 | 3/4 in. | 5 psi (.4 bar) | 550593 |
| GV-100 | 1 in. | 5 psi (.4 bar) | 550594 |
| GV-125 | 1 - 1/4 in. | 5 psi (.4 bar) | 550595 |
| GV-150 | 1 - 1/2 in. | 5 psi (.4 bar) | 550596 |
| GV-200 | 2 in. | 5 psi (.4 bar) | 551049 |
| GV-250 | 2 - 1/2 in. | 5 psi (.4 bar) | 550185 |
| GV-300 | 3 in. | 5 psi (.4 bar) | 550186 |
2. Electric Gas Shutoff Valve.
A gas shutoff valve is repaired on all systems used to protect a gas fueled cooking appliance to stop gas flow in the event of system actuation. A UL Listed electric gas valve can be used with either the Model MCH3 or ECH3 control head. The valves are rated for natural and LP gas. Valves are available in 120 VAC. Electric gas valves are available in the following sizes:
| Model No. | Valve Size | Maximum Operating Pressure | Part Number |
| EGVSO-75 | 3/4 in. | 50 psi (3.5 bar) | 550358 |
| EGVSO-100 | 1 in. | 25 psi (3.5 bar) | 550359 |
| EGVSO-125 | 1 - 1/4 in. | 25 psi (3.5 bar) | 550360 |
| EGVSO-150 | 1 - 1/2 in. | 25 psi (3.5 bar) | 550361 |
| EGVSO-200 | 2 in. | 25 psi (3.5 bar) | 550362 |
| EGVSO-250 | 2 - 1/2 in. | 25 psi (3.5 bar) | 550363 |
| EGVSO-300 | 3 in. | 25 psi (3.5 bar) | 550385 |
A UL Listed manual reset relay is required when using an electric gas valve. The Pyro-Chem Kitchen Knight II Model SM-120 solenoid monitor may be used for this purpose.
