Honeywell Aquastat L7148F Installation Instructions Manual

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Electronic Aquastat® Controller
APPLICATION
The L7148F Electronic Aquastat® Controller replaces
the function of the bulb and capillary electromechanical
Aquastat® with electronic temperature sensing and
microprocessor controlled relays.
The L7148F Electronic Aquastat® Controller has an
internal high limit controller and is intended for use in
gas-fired boilers using a 24 Vac burner circuit with
vestibules for a wiring enclosure. The L7148F can
replace a Honeywell L4080 High-Limit and R8225
Transformer Relay.
The L7148F has a 24 Vac burner output and is used in
gas boilers where ignition controls such as the Honeywell
S8600 Spark Ignition or SV9500/SV9501 SmartValve™
controls or standing pilot gas controls such as the
Honeywell VR8300 are powered from 24 Vac.
An external 120 Vac to 24 Vac transformer with 10 VA
minimum is required to power the L7148F. For total
external transformer VA requirements, add the 10 VA
requirement for the control, gas valve load requirement
(connections B1, B2), zone valve connection
requirement (see zone valve specifications), vent
damper requirement and VA requirement for any other
equipment. Total low voltage load must not exceed 4A.
The L7148F Electronic Aquastat® is available with quick
connect or AMP© plug connections. The 3/16 in. (5 mm)
B1 quick connect and AMP© plug connections meet
ANSI miswiring requirements. C(Z), W(T) and R(TV)
terminals are provided in a terminal block with screw
connections.
The complete L7148F system requires a sensor,
immersion well and transformer, all of which must be
ordered separately. See Table 1 for sensor
specifications.
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INSTALLATION INSTRUCTIONS
SPECIFICATIONS
High Limit Setpoint Range: 130°F to 240°F (54°C to
116°C). (Select models may differ.)
Differential: Fixed 10°F (6°C). (Select models may
differ.)
Operating Voltage Range:
L1-L2 Line Voltage Power: Nominal, 120 Vac.
R-C 24V Transformer Output: Nominal, 24 Vac.
Minimum/Maximum Ambient Temperature:
Minimum: -30°F (-9°C) with 2.0A 24V load.
Maximum: 150°F (66°C) with 2.0A 24V load.
Operating Relative Humidity: 0 to 95% RH
non-condensing.
Electrical Ratings (60 Hz only):
B1-B2: 2.0A at 24 Vac.
C1-C2: Full Load 7.4A at 120 Vac; Locked Rotor, 44.4A
at 120 Vac.
NOTE: Total low voltage load must not exceed 4.0A.
Case Dimensions: See Fig. 1.
Mounting: Vestibule mount.
Accessories:
Sensor: Thermistor sensor available separately. For
leadwire lengths available, see Table 1.
Immersion Well: Available separately. Contact your dis-
tributor or Honeywell sales representative to order, or
refer to Accessories for Immersion Wells, Compres-
sion Fittings, and Element Holders, form
68-0040.
Transformer: Available separately with either quick con-
nect terminals or AMP® plug connections. Contact
your distributor or Honeywell sales representative to
order.
121371AA Sensor Retaining Clip.
32002656-001 Sensor Retaining Spring.
L7148F
69-1065B-2