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607E--K: Installation Instructions
Table 4 – Color Coding for Indoor Fan Motor Leads
Black = High Speed
Orange = Med-High Speed
Red = Med Speed
Pink = Med-Low Speed
Blue = Low Speed
Selection of Proper Fan Speeds for Operation Modes:
Low Stage Cooling/Heat Pump: Using
external static pressure drops for wet coil, economizer, and filter, and
add them to dry coil measured on the system. Using this total static
pressure, look up
Table 5
to find the airflows available at the total static
pressure. For 208/230 VAC models, connect the chosen fan speed wire
to "LO COOL" connection on the IFB Board (see
models, connect the chosen fan speed wire to "LOW" connection on the
IFB (see
Fig.
11).
High Stage Cooling/Heat Pump: Using
external static pressure drops for wet coil, economizer, and filter, and
add them to dry coil measured on the system. Using this total static
pressure, use
Table 5
to find the airflows available at the total static
pressure. The speed chosen must provide airflow of between 350 to 450
CFM per ton of cooling. For 208/230 VAC models, connect the chosen
fan speed wire to "HI COOL" connection on the IFB Board (See
Fig.
11). For 460 VAC models, connect the chosen fan speed wire to
"HIGH" connection on the IFB (see
High Stage Enhanced Dehumidification Cooling (208/230 VAC
Models): Using the total static pressure for selecting the high stage
cooling speed, look up
Table 5
that total static pressure. All airflows highlighted in
acceptable for the Dehum speed. The speed chosen must provide airflow
of between 320 to 400 CFM per ton of cooling. To activate the high
stage enhanced dehumidification cooling mode, the shunt jumper must
be moved from the "No DH" to the "DH" selection. (See
up.) For 208/230 VAC models, connect the chosen fan speed wire to
"DHUM" connection on the IFB Board (see
Continuous Fan: Continuous fan speed is the same speed as Low Stage
Cooling.
Using the Same Fan Speed for More than One Mode: Some fan speeds
are ideal for more than one mode of operation. It is permissible to use a
field-supplied jumper wire to connect one speed tap wire to two or more
speed connections on the Interface Fan Board (IFB). Jumper wires must
use 18 AWG wire with at least 2/64" insulation.
Sequence of Operation
a. Continuous Fan
(1.) Thermostat closes circuit R to G energizing the blower
motor for continuous fan. The indoor fan is energized on
low speed.
b. Cooling Mode
(1.) Low Stage: Thermostat closes R to G, R to Y1, and R to O.
The compressor and indoor fan are energized on low speed.
The outdoor fan is also energized
(2.) High Stage: Thermostat closes R to G, R to Y1, R to Y2, and
R to O. The compressor and indoor fan are energized on
high speed. The outdoor fan is also energized.
c. Electric Heating Mode
(1.) Thermostat closes circuit R to W2 or W3, and R to G. There
are no on or off delays.
d. Heat Pump Heating
(1.) Low Stage: Thermostat closes R to G, R to Y1. The
compressor and indoor fan are energized on low speed. The
outdoor fan is also energized
(2.) High Stage: Thermostat closes R to G, R to Y1, R to Y2.
The compressor and indoor fan are energized on high speed.
The outdoor fan is also energized.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 5
-
Table
6, find the
Fig.
11). For 460 VAC
Table 5
-
Table
6, find the
Fig.
11).
to find lower speed/airflows available at
Table 5
Fig.
Fig.
11).
e. Heat Pump Heating with Auxiliary Heat
(1.) Thermostat closes circuits R to G, R to Y and R to W/W1 or
W2. The compressor, indoor and outdoor fans are
energized, as well as the electric heat relays.
f. Defrost Mode
The defrost mode is automatically energized by the defrost board
during heating mode. The defrost board energizes "O" (reversing
valve) and "W2" (electric heat). It also de-energizes the outdoor
fan. When defrost is complete, unit will return to heating mode.
If room thermostat is satisfied during defrost, unit will shut down
and restart in defrost on next call for heat.
Step 4 – Defrost Control
Demand Defrost Mode
The defrost mode is factory set to an initial 60-minute time interval. It
may also be adjusted to an initial interval of 30, 90, or 120 minutes.
During operation, the control optimizes current defrost time based on the
previous defrost interval and previous defrost period. If the previous
defrost period is less than 2 minutes for two consecutive defrost cycles
the control will lengthen the defrost interval by 15 minutes, up to a
maximum of 120 minutes or 30 minutes greater than the original
setpoint, whichever comes first. If the previous defrost period is more
than 5 minutes for two consecutive defrost cycles the control will
shorten the defrost interval by 15 minutes, down to a minimum of 30
minutes or 30 minutes from the original setpoint, whichever is first.
After the defrost condition is satisfied, or after a maximum of 10 minutes
in defrost mode, the unit will resume normal heating operation.
are
11, close
14
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