Drain Pan Trap Piping; Electric Heater Application/Operation; Variable Frequency Drive - Greenheck APEX-200 Installation, Operation & Maintenance Manual

Drain Pan Traps
Drain lines and traps should be run full size or larger from
the drain pan connection (drain pan connection is 1.25-inch
diameter female thread). Drain pans should have drain lines
and traps to permit the condensate from the coils to drain
freely. On all units with drain pans, the trap depth and the
distance between the trap outlet and the drain pan outlet
should be twice the static pressure in the drain pan section
under normal operation to assure the trap remains sealed.

Electric Heater Application/Operation

Factory installed electric post-heaters can be
provided to warm the air leaving the energy recovery
wheel to a user specified discharge temperature.
Electric heaters are available in 208, 230, or 460 VAC
(refer to heater nameplate for voltage).
Post-heaters are standard as 4-stage, step control.
Step control heaters are designed with multiple stages
made up of equal increments of heating capability. For
example, an 80 kW heater with four stages will be
composed of four 20-kW stages. Post-heaters come
standard with a discharge temperature sensor (with
Variable Frequency Drive for Fans (E7 Series by Yaskawa)
(see page 13 for VFD on energy recovery wheel)
Factory installed VFDs for the fans are programmed at the factory
per the settings shown in TABLE 1 below (see FIGURE 12 for key
pad). VFDs are shipped with a jumper between A1 to +V to allow
the unit to turn on at full speed until the appropriate control signal
can be applied. Remove the jumper when wiring the appropriate
.0-10 Vdc control signal. See FIGURE 13. Refer to the instruction
manual that ships with the unit when making adjustments. A copy
of the manual can be found online at www.drives.com. For
technical support, contact Yaskawa direct at 1-800-927-5292.
Parameters
A1-01 Access Level
A1-04 Password
b1-01 (Frequency) Ref Source
b1-02 Run (Command) Source
C1-01 Accl Time 1
C1-02 Decel Time 2
d2-01 Ref Upper Limit
d2-02 Ref Lower Limit
E1-04 Max Frequency
E2-01 Motor Rated FLA
H3-02 Terminal A1 Gain
H3-03 Terminal A1 Bias
L8-10 Cooling Fan Operation
O2-03 User Defaults
A1-01 Access Level
TABLE 1: Factory settings for VFD used on fans
Installation
Setting Comment
2 Advanced Level
0 Leave as default
1 Terminal - Analog Input A1
1 Contact Closure on S1
30 Seconds
30 Seconds
100% % of E1-04
50% % of E1-04
60 Hz Ref for d2-01, d2-02, H3-03
? A Nameplate amps
100% 10V = 60 Hz, 100% of E1-04
50% 0V = 30 Hz, 50% of E1-04
0 Fan only during RUN
1 Saves setting as user defaults
Set defaults by A1-03 = 1110
0 Operation Only
9
FIGURE 11: Drain pan trap dimensions.
field adjustable set point). The four stages will come
on one at a time until the discharge temperature set
point is satisfied). Post-heaters are not single point
wired (see Electrical Connections).
Post-heaters supplied with Greenheck temperature
control package are 3-stage with binary control that
provides 7 steps of heating. For example, a 35 kW
heater with three stages will be composed of 5, 10,
and 20 kW stages. The stages essentially 'mix and
match' to provide heat output from 5 kW to 35 kW, in
5 kW increments.
FIGURE 12: VFD key pad & LCD
FIGURE 13: Control signal to VFD
6 in. min.
6 in. min.
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