17
EP Series
8733922168
Revised 12-13 Subject to change without prior notice
Heat Recovery Package
• CFM count indicator (See Figure #9, item [6])
blinks to indicate approximate airflow in CFM and
may flicker when unit is off.
• Each blink of the LED represent approximately
100 CFM of air delivery so if the LED blinks 12
times, pauses, blinks 12 times, etc. the blower is
delivering approximately 1200 CFM.
Thermostat Outputs
Y1
First Stage Compressor Operation
Y2
Second Stage Compressor Operation
G Fan
O
Reversing Valve (energized in cooling)
W1
Auxiliary Electric Heat (runs in conjunc
-
tion with compressor)
EM/W2 Emergency Heat (electric heat only)
NC
Transformer 24 VAC Common (extra
connection)
C1
Transformer 24 VAC Common (primary
connection)
R
Transformer 24 VAC Hot
H
Dehumidification Mode
AIRFLOW SELECTOR
The airflow selector (Figure #9, items [2] & [3])
allows airflow adjustment to meet application
requirements and to ease troubleshooting.
Caution
Only one switch can be enabled at a time. Refer to
table for airflow settings.
CFM Selector (FIg #9, Item [2]) must remain with
only “A” being enabled.
ADJUST Selector can be adjusted to NOM, (+), (-),
or TEST. NOM, (+) and (-) can be adjusted as
needed by application. TEST is used for
troubleshooting to override unit airflow to 100%.
Caution
Do not set the ADJ DIP switch to the (-) setting
when electric heaters are installed. Doing so may
cause the heaters to cycle on their thermal
overload switches, potentially shortening the of
the switches.
Caution
Always disconnect the power before changing
DIP switch positions on the interface board, and
then reset the unit.
DEHUMIDICICATION METHOD
SELECTOR
Dehumidification method selector (Figure #13, item
[11]) is used to select between the following two
methods:
1) Units equipped with optional Hot Gas Reheat, on
dehumidification call (the “H” terminal on the
thermostat is energized) the reheat outputs will
energize the hot gas reheat valve in the circuit and
the heat pump will start in dehumidification mode.
