Nailor 37S Manual page 130

GENERAL INFORMATION FOR ALL TERMINAL UNITS
Checkout Procedure
The CSP-5002 actuator will take up to 2.5 minutes for a 45 degree stroke damper and up to 5.0 minutes for a 90 degree stroke damper to
cycle from its minimum to its maximum setting and vice versa. It is important therefore when verifying minimum and maximum flow limits, by
moving the slider(s) right or left as previously described, to wait sufficient time to ensure the actuator has moved to its correct position and
that the live velocity read-out (if used) has settled.
Live Supply Volume Readout
A voltage output corresponding to actual primary air volume may be monitored at the room thermostat to assist in balancing and
troubleshooting. The output signal is the same as the airflow volume vs. DC voltage calibration curve. The test lead (HSO-5001) is
connected to the innermost meter taps on the thermostat scaleplate (see Figure 9).
Supply Air Temperature Sensing
A duct mounted temperature sensor (thermistor) is used to measure primary air temperature in control sequences involving automatic
changeover (ACO) or morning warm-up (MWU). The probe is attached to the inlet collar and wired to the low voltage controls enclosure. To
ensure proper operation for auto changeover, a minimum flow setting should be used for both heating and cooling modes. This allows airflow
to constantly pass over the duct temperature sensor.
Proportional Reheat Control
Hot water valves and SCR controllers with a 0 -10 Vdc control signal (10mA max,) are wired (+) to terminal 'T2' on the thermostat and (-) to
the grounded side of the low voltage control circuit. T2 is an output with limits and it must therefore be ensured that the thermostat limits are
dialed out (max. pot. fully CW and min. pot fully CCW) for unrestricted operation.
FAN POWERED TERMINAL UNITS
Night Shut Down
Units ordered with optional Night Shut Down (NSD) sequences employ an airflow switch to sense when primary air has been shut down.
When the airflow switch opens the fan and optional heat are shut down. Upon the primary air starting, the airflow switch will close and return
the unit to normal operation.
Night Temperature Setback
Units ordered with optional Night Temperature Setback (NTSB) sequences employ an airflow switch to sense when the primary air (central
air handler) has been shut down. When the airflow switch opens, a lower night time temperature setpoint is initiated. The unit fan and
optional supplementary heat will cycle intermittently to maintain night setpoint temperature. Upon start up of the central air handler, the unit
will return to daytime operation. Amount of setback is either fixed or adjustable dependent on control sequence. Refer to control submittal.
Night Cycle
On series units with optional night cycle sequences, an airflow switch de-energizes unit fan upon loss of primary (central system) air. Upon a
call for heat, the thermostat will override the airflow switch and cycle the unit fan followed by any supplementary heat intermittently to
maintain day setpoint temperature.
On parallel units, basic control sequences cycle the fan and supplementary heat intermittently as standard in response to thermostat
demand. This will therefore still occur at night when the central air has been shutdown.
Checkout Procedure (Day / Occupied Mode)
Series Fan Powered Terminal Units: The fan should be energized regardless of slider(s) position. Dependent on control sequence ordered,
thermostat may have one or two sliders. Consult control sequence submittal / wiring diagram and thermostat calibration procedure.
Parallel Fan Powered Terminal Units: Fan will only cycle upon a call for heat. Move single slider (or both if a separate heating or night slider
is present) full right to energize fan. Dependent on control sequence ordered, thermostat may have one or two sliders. Consult control
sequence submittal / wiring diagram and thermostat calibration procedure.
Checkout Procedure (Night / Unoccupied Mode)
Move thermostat slider(s) full right to energize fan and supplementary heat.
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