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 on select models.
• All adjustments accessible inside front cover.
• Push-in terminals for quick connecting.
• Single sensing element for easy installation.
• Two SPST snap switches act independently at respective temperature settings..

Product Specifications

Hazmat Information

UN 1294, TOLUENE, 3, II

Application

High Limit and Circulator

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

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.

Switching Action

SPST: High Limit & Circulator

Well Spud Size (in.)

3/4 in. - 14 NPT

Well Spud Size (mm)

19 mm - 14 NPT

Insulation Depth (in.)

1 1/2 in.

Insulation Depth (mm)

38 mm

Electrical Ratings, Ignition

Transformer Load: 360 VA