Overview
High limit, low limit and/or circulator controllers used to regulate boiler water temperature in gas- or oil-fired hydronic heating systems.
Features
- An immersion type liquid-filled sensing element actuates two snap switches.
- One switch operates as a high limit control.
- The other switch operates as a low limit and/or circulator control, depending on the model.
- Controller may be mounted in any positioning and needs no leveling.
- Separate, easy-to-read, calibrated dial and setpoint adjustments for each switch.
- Differential adjustment on low limit or circulator switch.
- All adjustments accessible inside front cover.
- Push-in terminals for quick connecting.
- Single sensing element for easy installation.
- One SPST and one SPDT snap switches act independently at respective temperature settings.
Product Specifications
- Hazmat Information
- UN 1294, TOLUENE, 3, II
- Application
- High and Low limit
- Dimensions (in.)
- 3 7/8 in. high x 4 1/8 in. wide x 2 3/4 in. deep.
- Dimensions (mm)
- 98 mm high x 105 mm wide x 70 mm deep.
- Temperature Range (F)
- Maximum--150 F at switches; 265 F at sensing element
- Temperature Range (C)
- Maximum--66 C at switches; 129 C at sensing element
- Mounting
- Horizontal
- Electrical Ratings
- 0.25 A @ 0.25 to 12 Vdc; At Full Load-- 8A @ 120 Vac: 5.1A @ 240 Vac; At Locked Rotor-- 48A @ 120 Vac: 30.6A @ 240 Vac
- Approvals, Underwriters Laboratories Inc.
- UL Listed: File No. MP466, Vol. 12, Sec. 4, Guide No. MBPR2
- Approvals, Canadian Standards Association
- Certified: File No. LR95329-1
- Tradeline Value
- Tradeline
- Operating Humidity Range (% RH)
- 0 to 95% RH, non-condensing
- Operating Temperature Range (F)
- High Limit-- 130 F to 240 F; Low Limit-- 110 F to 220 F
- Operating Temperature Range (C)
- High Limit-- 54 C to 116 C; Low Limit-- 43 C to 104 C
- Differential Temperature (F)
- High limit : 10 F fixed; low limit: 10-25 F adj.
- Well Spud Size (in.)
- 3/4 in. - 14 NPT
- Well Spud Size (mm)
- 19 mm - 14 NPT
- Insulation Depth (in.)
- 1 1/2 in. to 4 in.
- Insulation Depth (mm)
- 38 mm
- Electrical Ratings, Ignition
- Transformer Load: 360 VA
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