22
M
INI
-S
PACE
EC I
NSTALLATION
, O
PERATION
AND
M
AINTENANCE
M
ANUAL
3.0
START-UP/COMMISSIONING
3.1 Operation
For new installations, ensure the unit is ready to operate
before starting it by completing the Start-up Checklist.
NOTE
A Warranty Registration and Start-up Checklist
is provided in the unit data package. It should be
completed during start-up and sent to STULZ.
This checklist should be used as a guideline for
items that need to be confi rmed during start-up.
Start-up must be performed by a journeyman refrigeration
mechanic or air conditioning technician.
3.2
Step-by-Step Start-Up Instructions
1. Replace all removed access panels and equipment prior
to performing the start-up checks.
2. Apply power to the precision A/C system at the main
power disconnect switch. Turn the system on at the
controller.
3. Ensure that all blowers and fans are rotating correctly
and freely without any unusual noise.
NOTE
The compressor may have a time delay on start-up.
Water/glycol-cooled units have a head pressure
regulating valve that has been factory set. A valve
adjustment may be required based on water
temperatures or water/glycol fl ow conditions at
your site. Valve adjustments are made through
the
E
2
controller. Refer to the
STULZ E
2
Series
Microprocessor Controller Operators Manual
for instructuions.
4. Test cooling operation by adjusting the temperature
setpoint below the actual room temperature. The com-
pressor should come on (in DX units) and the discharge
air should feel cooler than the return air.
5. Test heating operation by adjusting the temperature
setpoint above the actual room temperature. The source
of heat should be energized to increase discharge air
temperature.
6. Test
humidifi cation operation by creating a demand for
humidifi cation. Use an amp meter to determine current
draw of humidifi er. Visually check for vapor leaving the
steam head or feel if the cylinder is warm to verify if the
humidifi er is operational. In all cases, one to six hours
might be required to see a desired level or rise of humid-
ity in the conditioned space. Once room conditions have
been programmed or set, a repeat visit to the conditioned
site may be required to ensure the humidifi er is meeting
the room’s requirements.
7. Test
dehumidifi cation operation by creating a demand
for dehumidification. Decrease the dehumidification
setpoint 10% below the actual room conditions. The
compressor circuit will be energized to begin the dehu-
midifi cation process. While in this mode, the room tem-
perature may decrease and the reheat function may ac-
tivate. As conditions in the room change, you may have to
readjust the setpoint as you check the operation. An
adequate heat load within the space is required.
8. To verify electric reheat, use an amp meter on the heater
circuit to determine if the heater is operational. For hot
gas reheat, use a voltmeter and a point-to-point method
to verify the control signal has energized the hot gas
reheat solenoid coil. For hot water reheat, verify that the
control signal has energized the control valve and the
temperature of the steam or water has decreased as it
passes through the unit.
In all cases, one to six hours might be required to see a
desired level or decrease of humidity in the conditioned
space. Once room conditions have been programmed or
set, a repeat visit to the conditioned site may be required
to ensure the dehumidifi cation mode is meeting the
room’s requirements.
3.3 Unit
Shutdown
To shut down the unit, command the shutdown from the BMS
managing the unit or use the graphic terminal connected to
the unit controller to power down the unit, as described in the
STULZ E
2
Series Microprocessor Controller Operators
Manual
.
To perform an emergency shutdown, set the main power
disconnect switch to the Off position.
3.4
Microprocessor Controller
Programming
The microprocessor controller is factory programmed based
on the optional features selected. Most applications require
no fi eld start-up or program adjustment beyond setting the
current date and time. Separate operating instructions for
the controller have been sent with your unit, including each
feature’s factory “default” setting and the available adjustment
range, if applicable.
