Trane INTELLIPAK ™ ™ ™ ™ ™ Commercial Single-Zone Rooftop Air Conditioners with CV or VAV Control - Manual (Page 67)

65
Unit Start-Up (Continued)
Use this data to assist in calculating a new fan drive if the
CFM is not at design specifications.
An alternate method with less accuracy is to measure the
static pressure drop across the evaporator coil. This can be
accomplished by;
a. drilling a small hole through the unit casing on each
side of the coil.
Note: Coil damage can occur if care is not taken
when drilling holes in this area.
b. Measure the difference between the pressures at
both locations.
c. Plot this value onto the appropriate pressure drop
curve in Figure 4-3. Use the data in Table 4-2
(Component Static Pressure Drops) to assist in
calculating a new fan drive if the CFM is not at
design specifications.
d. Plug the holes after the proper CFM has been
established.
9. Press the STOP key at the Human Interface Module in
the unit control panel to stop the fan operation.
Variable Air Volume Systems
1. Ensure that the "System" selection switch at the remote
panel is in the "Off" position.
2. Close the disconnect switch or circuit protector switch
that provides the supply power to the unit's terminal
block 1TB1 or the unit mounted disconnect switch 1S14.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote discon-
nects before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be inadvert-
ently energized. Failure to disconnect power before ser-
vicing could result in death or serious injury.
HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK
1TB1 OR UNIT DISCONNECT SWITCH 1S14.
3. Turn the 115 volt control circuit switch 1S1 and the 24
volt control circuit switch 1S70 to the "On" position.
4. Open the Human Interface access door, located in the
unit control panel, and press the SERVICE MODE key to
display the first service screen. Refer to the latest edition
of the appropriate SAHF-PTG manual for CV or VAV ap-
plications for the SERVICE TEST screens and program-
ming instructions.
5. Use Table 4-1 to program the following system compo-
nents for operation by scrolling through the displays;
Supply Fan
Inlet Guide Vanes (100% Open, if applicable)
Variable Frequency Drive (100% Output, if applicable)
RTM Occ/Unocc Output (Unoccupied)
6. Once the configuration for the components is complete,
press the NEXT key until the LCD displays the “Start test
in __Sec.” screen. Press the + key to designate the de-
lay before the test is to start. This service test will begin
after the TEST START key is pressed and the delay
designated in this step has elapsed. Press the ENTER
key to confirm this choice.
WARNING
Live Electrical Components!
During installation, testing, servicing and troubleshoot-
ing of this product, it may be necessary to work with live
electrical components. Have a qualified licensed electri-
cian or other individual who has been properly trained in
handling live electrical components perform these
tasks. Failure to follow all electrical safety precautions
when exposed to live electrical components could result
in death or serious injury.
7. Press the TEST START key to start the test. Remember
that the delay designated in step 6 must elapse before
the fan will begin to operate.
8. With the IGV's/VFD at 100% and the supply fan operat-
ing at full airflow capability, measure the amperage at the
supply fan contactor 1K16 & 1K15 (additional contactor
for 90 through 130 Ton units). If the amperage exceeds
the motor nameplate value, the static pressure is less
than design and the airflow is too high. If the amperage
is below the motor nameplate value, static pressure may
be too high and CFM may be too low. To determine the
actual CFM (± 5%);
a. Measure the actual fan RPM
b. Calculate the Theoretical BHP
Actual Motor Amps X Motor HP
Motor Nameplate Amps
c. Plot this data onto the appropriate Fan Performance
Curve in Figure 4-4. Where the two points intersect,
read straight down to the CFM line.
Use this data to assist in calculating a new fan drive if the
CFM is not at design specifications.
An alternate method with less accuracy is to measure the
static pressure drop across the evaporator coil. This can be
accomplished by;
a. drilling a small hole through the unit casing on each
side of the coil.
Note: Coil damage can occur if care is not taken
when drilling holes in this area.
b. Measure the difference between the pressures at
both locations.
c. Plot this value onto the appropriate pressure drop
curve in Figure 4-3. Use the data in Table 4-2
(Component Static Pressure Drops) to assist in
calculating a new fan drive if the CFM is not at
design specifications.
d. Plug the holes after the proper CFM has been
established.
9. Press the STOP key at the Human Interface Module in
the unit control panel to stop the fan operation.