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IM 893-10 • ROOFPAK SINGLEZONE UNITS
Power Up
1. Close the unit disconnect switch. With the control system
switch S1 in the OFF position, power should be available
only to the control circuit transformer (T1) and the
compressor crankcase heaters.
2. Turn the Switch S1 to ON. Power should now be
supplied to the control panel, and the LEDs on MCB1
should follow the normal startup sequence (refer to
Fan Start-up
1. Verify all duct isolation dampers are open. Unit mounted
isolation dampers may be in the supply or return
sections.
2. Place the unit into the Fan Only mode through the
keypad menu
Main Menu\Quick Menu\Ctrl Mode = Fan
.
3. Turn Switch S7 to ON. The controller should enter the
Startup Initial operating state. If the fan does not run:
a. Check fuses F1 and F3.
b. Check the manual motor protectors or that the
circuit breakers have not tripped.
c. Check the optional phase monitor.
4. If the fans are equipped with optional spring isolators,
check the fan spring mount adjustment. When the fans
are running they should be level. Refer to
5. Verify the fan rotation is correct.
6. Verify the DHL safety is opening at a pressure
compatible with duct working pressure limits.
NOTE:
The supply and return fan drives usually are selected
for operation in the drive’s mid-speed range. The
return fan drives are usually shipped with fixed pitch
sheaves that will provide the selected fan speed;
however, the supply fan drives are usually shipped
with variable pitch sheaves that are adjusted to
provide the minimum fan speed. Both drives should
be adjusted for proper airflow during air balancing.
See
.
Economizer Start-up
CAUTION
Adjust dampers properly. Improper adjustment can damage
the dampers. When an economizer is ordered without an
actuator, the linkage requires a 3.14” linear stroke to open it
fully. Do not allow dampers to be driven beyond their normal
full closed or full open position.
1. Check whether the outdoor air is suitable for free
cooling by displaying the keypad menu
Main Menu
View\Set Unit\Econo Status. See
Economizer Status” section
.
Low
indicates low outdoor
air enthalpy;
High
indicates high outdoor air enthalpy.
to verify that
the enthalpy changeover control is working properly.
You may want to take temperature and humidity
measurements.
2. At the keypad, set the cooling setpoint low enough so the
controller calls for cooling. Adjust the value in
View\Set
Unit\Cooling\Occ Clg Spt
below the temperature shown
in
View\Set Unit\Temperatures\Control Temp
. In addition,
on DAC units, adjust the value in
View\Set Unit\Cooling\
DAT Clg Spt
below the temperature shown in
View\Set
Unit\Temperatures\Discharge Temp.
3. Place the unit into cooling mode through the keypad
menu
Quick Menu\Ctrl Mode = Cool Only
.
4. Observe the outdoor air dampers:
a. If the outdoor enthalpy is low, the control algorithm
should start to modulate the dampers open to
maintain the discharge air setpoint.
b. If the outdoor enthalpy is high, the dampers should
maintain their minimum position. Look at menu
View\Set Unit\Min OA Damper\Min OA Pos
. Change
this entry to another value. Verify that the dampers
move to the new minimum position setpoint.
5. If the unit is equipped with the electromechanical
enthalpy changeover control (Honeywell H205) and the
outdoor air condition is borderline, attempt to change its
input to the MicroTech III controller by turning the switch
adjustment to A or D. Check enthalpy status in keypad
menu
Main Menu View\Set Unit\Econo Status. See
“Determining Economizer Status” section.
If this
reading is
Low
, go to Step 5a. If it is
High
, go to Step 5b.
NOTE:
It may not be possible to check the economizer
operation in both low and high enthalpy states on the
same day. If this is the case, repeat this procedure on
another day when the opposite outdoor air enthalpy
conditions exist.