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MODEL SM-120/24 SOLENOID MONITOR
The Model SM0120/24 solenoid monitor is used in conjunction with the Model ECH3 control head to supervise the actuation and detection circuits. In the event of a problem in the circuit, a light on the monitor goes out. The Model SM-120 is used with the Model ECH3-120 control head. The Model SM-24 (P/N 550303) is used with the Model ECH3-24 control head. Two sets of NO/NC dry contacts are provided. The unit mounts directly to a three gang wall outlet box. The Model SM-120 (P/N 550302) acts as a reset relay when used with an electric gas valve. Electric gas valve wiring instructions are provided in the installation section of this manual. See Figure 2-18.
PIPE AND FITTINGS
Pipe and fittings must be furnished by the installer. Schedule 40 stainless steel, chrome plated, or black pipe and fittings must be used. Galvanized pipe and fittings are not to be used.
NOZZLES
Nozzles have been developed for appliance, plenum, and duct applications. All nozzles have a specific flow point valve and are supplied with blow-off caps to prevent clogging. Each nozzle is stamped with the model number. See Figure 2-19. Application limitations are provided in the design section of this manual.
| Part No. | Description | Flow No. |
| 551029 | 1H Nozzles, pack of ten (10) | 1 |
| 551026 | 1H Nozzles, pack of ten (10) | 1 |
| 551028 | 2H Nozzles, pack of ten (10) | 2 |
| 551027 | 2L Nozzles, pack of ten (10) | 2 |
| 551038 | 2D Nozzles, pack of ten (10) | 2 |
SWIVEL ADAPTOR (P/N 423572)
The Swivel adaptor consists of a swivel nut, swivel body, and swivel ball. All are chrome-plated. The swivel adaptor allows the nozzle to be rotated approximately 300 in all directions. Swivel Adaptors must be ordered as a Swivel Adaptor Shipping Assembly, Part No. 423572, which contains 25 swivel adaptors. See Figure 2-20.
