LAARS Mini-Therm JVS (Sizes 50-225) - Install and Operating Manual - Manual (Page 20)

LAARS Heating Systems Page 20
WARNING
The boiler must be electrically grounded in
accordance with the requirements of the authority
having jurisdiction or, in the absence of such
requirements, with the latest edition of the national
Electrical Code, ANSI/NFPA 70, in the U.S. and with
the latest edition of CSA C22.1 Canadian Electrical
Code, Part 1, in Canada. Do not rely on the gas or
water piping to ground the metal parts of the boiler.
Plastic pipe or dielectric unions may isolate the boiler
electrically. Service and maintenance personnel who
work on or around the boiler may be standing on wet
floors and could be electrocuted by an ungrounded
boiler.
AVERTISSEMENT
La chaudière doit être mis à la terre conformément
aux prescriptions de l'autorité ayant juridiction ou,
en l'absence de telles exigences, avec la dernière
édition du national Electrical Code, ANSI/NFPA
70, aux ÉTATS-UNIS et à la dernière édition de la
norme CSA C22.1 Code électrique canadien, partie
1, au Canada. Ne pas compter sur le gaz ou l'eau
tuyauterie à la masse des pièces métalliques de la
chaudière. Tuyau en plastique ou diélectrique les
syndicats peuvent isoler la chaudière électrique.
SECTION 6.
6A. Electrical Wiring
Follow these instructions to make the necessary
initial electrical connections.
1. Remove the two screws attaching the front cover
of the control box.
2. There are wires coiled in the area on the right
side of the control box, supplied with wire nuts:
black wires and white wires.
3. Follow the schematic in Figures 14A. and 14B.
Remove the wire nut from the two sets of wires,
and connect the hot lead from the 115V power
supply, and the neutral lead to the white wires.
4. Attach the leads from the wall thermostat to
the terminal strip, located on the left side of the
control box.
5. Check the boiler wiring and pump for correct
voltage, frequency and phase. If the pump circuit
is other than 115V, be sure there is an appropriate
transformer or relay installed. The pump relay is
suitable for pumps of 1/3 HP or less (max 5A).
6. For systems with multiple zone pumps or valves
(see Figure 17).
A means of disconnecting the electrical supply must
be provided within sight of the boiler. The pump and
boiler must be wired as shown to insure that the pump
is running whenever the boiler is firing.
Flow Switch: If the system includes a flow switch,
it should be wired in series with the high-limit switch.
The boiler will not fire unless the pump is running and
the flow switch is closed.
Field installed safety devices and operating
controllers, such as valve end switches, relays, timers,
can be connected to the boiler through the wall
thermostat circuit. Do not exceed a draw of 40VA on
the transformer secondary. A 2-Amp fuse is here to
protect the transformer.
6B. Outdoor Reset.
To comply with Federal Law, the Mini-Therm JV
automatically sets water temperature based on outdoor
temperature. A sensor (E2347400) supplied must
be located outdoors yet out of direct sunlight. If not
connected, the boiler may not be fully functional.
Connect the sensor to the terminals labeled "COM"
and "OUTDOOR" located on the left side of the
control box, using outdoor rated min 24 gauge wire.
(See Figures 13A and 13B)
Figure 13B
Figure 13A
Terminals