Instructions / Assembly

START UP PROCEDURE / TROUBLESHOOTING
1-500 7
START-UP PROCEDURE
IMPORTANT
1. Start-up and adjustment procedures should be
performed by a qualified service agency.
2. No water-flow can cause a freeze condition
resulting in damage to the coil.
3. Never leave the unit filled with water in a building
without heat unless a glycol solution has been
added.
PRIOR TO OPERATION
1. Check that all the electrical connections are tight.
2. Check that the unit has the correct main power supply
wired to the unit and is within +/- 5% of the voltage
shown on the unit serial plate.
3. Check that the power supply to the unit is protected with
a properly sized fused or circuit breaker switch.
4. Check that the unit has no visible damage and that all
the components are secure.
5. Check that all field electrical and mechanical work has
been performed according to all applicable Federal,
State, and Local codes.
6. Check that the system has been correctly flushed.
7. Check for any water leaks.
8. Check rigidity of unit mounting. Tighten all fasteners if
necessary.
9. Inspect piping, strainers, fittings, etc.
INITIAL START-UP
1. Set thermostat to lowest position.
2. Turn on power supply to unit.
3. Open field installed supply and return shut-off valves.
4. Raise thermostat setting to desired position.
5. Check for correct fan operation, no excessive noise or
vibrations.
6. Confirm that air is blowing out of the discharge opening.
7. Adjust louvers for desired heat distribution.
8. Check water flow rates and compare to design.
9. To insure proper sequence of operation, cycle unit on
and off a few times by raising and lowering thermostat
setting.
TYPICAL SEQUENCE OF OPERATION
Fan Operation
Fan operation can be either intermittent on a call for heat
from a room stat or continuous. An aquastat accessory can
be strapped to the return piping to prevent fan operation
when heat is not being supplied to the unit heater.
Model size 45 features a solid state speed control that allows
infinite speed control between high speed and low speed
and also provides an “OFF” setting for the unit.
Intermittent Hot 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.
Continuous Hot Coil
A valve opens to allows continuous hot water flow to the coil
whenever the system is energized. Continuous hot coil
operation may help prevent coil freeze-ups in cold weather,
however, a proper glycol mix is also recommended.
Table 7.1 – Troubleshooting
c Speed control only available on model size 45.
TROUBLE POSSIBLE CAUSE POSSIBLE REMEDY
Unit Not Operating – Power On 1. Speed control in “OFF” position.c
2. Tripped circuit breaker(s).
3. Loose supply power wiring.
1. Turn speed control to any position but “OFF”.
2. Reset the tripped circuit breaker(s).
3. With power OFF, inspect wiring connections.
Unit Operating – No Heat 1. Thermostat not calling for heat.
2. Loose wiring.
3. Faulty control valve.
1. Adjust setting on room thermostat.
2. Inspect wiring at thermostat and valve.
3. Test and replace valve if faulty.
Unit Fan Not Operating 1. Motor internal overload protection
tripped.
2. Motor failure.
3. Speed control failure (size 45 only)
4. Fan not required.
5. No power to the fan.
1. Let motor cool to allow overload protection to
automatically reset
2. Replace motor.
3. Replace speed control.
4. Check that thermostat is set to call for heat.
5. Check wiring connections and panel fuse.