Aquastat® Relays 140-240 Degrees High Limit (Honeywell)
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Honeywell L8148 Aquastat® Relay:
Immersion-type controllers that combine high limit protection with switching relay control of burner and circulator motors.
High limit opens burner circuit only.
Include transformer and accessory terminals for adding a remote low limit controller.
Case available for horizontal or vertical mounting.
Requires a 24 Vac thermostat with heat anticipator set at 0.2A.
TRADELINE models include well adapter, tube of heat-conductive compound and range stops.
Operating Range, High Limit (F) 120F to 240F
Operating Range, High Limit (C) 54 C to 116 C
Electrical Ratings (burner AFL) 3.7 A @ 240 Vac, 7.4 A @ 120 Vac
Electrical Ratings (burner ALR) 22.2 A @ 240 Vac, 44.4 A @ 120 Vac
Electrical Ratings (burner millivolt) 0.25 A @ 1/4 to 12 Vdc
Electrical Ratings (circulator AFL) 3.7 A @ 240 Vac, 7.4 A @ 120 Vac
Electrical Ratings (circulator ALR) 22.2 A @ 240 Vac, 44.4 A @ 120 Vac
Voltage 120 Vac
Capillary Length (in.) 4 1/2 in.
Capillary Length (mm) 114 mm
Switching Action SPST: High Limit & Circulator
Approvals, Underwriters Laboratories, Inc. UL Listed: File No. MP466, Vol. 13, Sec. 2, Guide No. MBPR2.
Approvals, Canadian Standards Association Certified: File No. LR1620, Guide No. 400-E-O
Dimensions (in.) Horizontal Mount: 4 5/16 in. high, 6 1/8 in. wide, 3 1/8 in. deep, Vertical Mount: 6 1/8 in. high, 4 5/16 in. wide, 3 1/8 in. deep
Dimensions (mm) Vertical Mount 156 mm high, 110 mm wide, 79 mm deep, Horizontal Mount: 110 mm high, 156 mm wide, 79 mm deep
Insulation Depth (in.) 1 1/2 in. to 3 in. less well.
Insulation Depth (mm) 38 mm to 76 mm less well
Mounting Vertical Mounting/Horizontal Mounting
Temperature Ratings (max. ambient)(F) 150 F with 1.2 A 24 V load; 77 F with 1.4 A 24 V load
Temperature Ratings (max. ambient)(C) 66 C with 1.2 A 24 V load; 25 C with 1.4 A 24 V load
Electrical Connections Quick Connect / Screw
Description Aquastat Controller
Tradeline Value Tradeline
Differential Temperature (F) 8 F fixed
Humidity Ratings (% RH) 0 to 95% RH, non-condensing
Frequency 60 Hz
Setpoint Temperature Range (C) 116 C
Anticipator 0.2 A
Maximum Operating Pressure (psi) Immersion Well: 255 psi Maximum Operating Pressure (kPa) Immersion Well: 1757 kPa Setpoint Temperature Range (F) 240 F.
Used in Columbia Boilers:M175ACB
Used in Vailant Gas Boilers: GA92-100EIVD
Replaces Aquastat Part Numbers:
L8148E1273 L8148E1141 97-4785QRCV L8048 B L8048B L8148J1009 L8148E1042 CARL8148J1009.