Operation; Prior To Operation; Initial Start-Up; Automatic Control Operations - Modine LODRONIC HCH 22 Manuel D'installation Et D'entretien

INSTALLATION / OPERATION
Figure 8.1 - Suggested Piping Arrangements
Hot Water Systems
Arrangements shown are recommendations only. Where horizontal units are
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shown, vertical units can be substituted or vice versa. For modifications to
piping suggestions shown, refer to your local plumbing authority.
Electrical Connections (Cont.)
2. Electric wiring must be sized to carry the full load amp draw
of the motor, starter, and any controls that are used with
the unit heater. All units with power codes 04, 05, 09, or
10 (polyphase motors) must be provided with suitable
overcurrent protection in circuit supplying heater at
installation. Overcurrent protectors should be sized based
on motor current rating shown on the unit serial plate, and
applicable national electric code procedures.
All units are provided with an electrical junction box.
Junction boxes are either integral to the motor or attached
to the unit casing. Units with explosion-proof motors have
an explosion-proof junction box attached to the motor.
Any damage to or failure of Modine units caused by
incorrect wiring of the units is not covered by Modine's
standard warranty.
3. Location of room thermostat, when supplied, should be in
the natural circulating path of room air. Mount thermostat
about five feet above floor level where it will not be affected
by heat from the unit or other sources of drafts that would
prevent it from properly controlling room temperature. See
instructions packed with the thermostat.

OPERATION

Prior to Operation

1. Make sure fuses are installed in fused disconnect switches.
2. Check all electrical connections to assure they are secure.
3. Check rigidity of unit mounting. Tighten all fasteners,
if necessary.
4. Inspect piping, strainers, traps, fittings, etc.

Initial Start-Up

1. Set thermostat to lowest position.
2. Turn on power supply to unit.
3. Open return gate valve, and then open supply gate valve
to unit.
4. Raise thermostat setting to desired position.
5. Adjust louvers (if provided) for desired heat distribution.
6. To insure proper sequence of operation, cycle unit on and off
a few times by raising and lowering thermostat setting.
7. Check for proper rotation of fan. All fans must rotate in a
counterclockwise direction when viewed from the back
of the unit heater.
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Automatic Control Operations

Install one of the following operating systems for continuous
automatic control.
Intermittent Fan Operation — Hot Coil
A room thermostat starts and stops the fan motor. An aquastat is
sometimes strapped to the return piping to prevent fan operation
when heat is not being supplied to the unit heater.
Continuous Fan Operation — Intermittent Hot/Cold Coil
A room thermostat controls a valve which opens to allow hot
water to supply the unit and closes to shut off the supply when
the thermostat is satisfied.
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