INSTALLING AND WIRING THE ZP3-HPS-ESP
WIRING THE TRANSFORMER:
Wire the separate 24 Volt transformer to the
24VAC POWER ‘R’ and ‘C’ terminals. Use
conventional 18-2 thermostat wire. After
removing the outer jacket, strip approximately
1/8” insulation off of each wire. Land each lead to
the 24VAC POWER screw terminals marked C
and R.
WIRING THE ZPA-OTS OUTDOOR SENSOR
FOR HIGH AND LOW BALANCE POINT
CONTROL:
The balance point feature can be used for both
conventional or fossil fuel applications allowing
up to 2 stages of cooling and 3 stages of heating.
For fossil fuel systems having a 2 stage furnace,
‘W1’ and ‘W2’ are jumpered at the furnace. This
method utilizes the internal furnace upstage
timer to bring on second stage fossil fuel. The
ZPA-OTS Outdoor Sensor can be used for both
high and low balance point control by adjusting
the onboard balance point dials on the panel.
High BP is adjustable from 45° F to 65° F. Low BP
is adjustable from 0° F to 40° F. If the outdoor
temperature goes above the High BP setting, the
system will not stage auxiliary heat. If the outdoor
temperature falls below the Low BP setting, only
the auxiliary heat source will be used. High BP
can be overridden by placing any zone
thermostat in the emergency heat mode.
Mount the sensor inside the heat pump cabinet
to avoid direct sunlight, freezing rain or snow.
The sensor requires separate 18-2 thermostat
wire. Connect the sensor leads using wire nuts.
Land the other end to the SENSOR screw
terminals marked OT on the panel.
TEST, CHECK AND STARTUP:
1. Verify that all component wires have been
connected to the proper terminals and are secure.
2. Make sure that the selector switches on the
panel are in their proper position for the specific
application.
3. Apply 24 Volt power to the panel.
4. Place all zone thermostats in the OFF mode with
Auto fan.
5. With no calls taking place, the following panel
LEDs should be lit:
24V
LIMIT
ZD1
ZD2
ZD3
6. Visually confirm that all zone dampers are in the
open position.
7. Place zone 1 thermostat in the continuous fan
ON mode and the system blower should come on.
The following panel LEDs should be lit:
24V
G
LIMIT
ZD1
Note: If system static pressure goes above
setpoint, the SPS LED will light along with the non-
calling zone LEDs until non-calling zone dampers
modulate to relieve the static pressure then both
LEDs will turn off.
8. Put zone 1 thermostat in Auto fan and repeat the
same steps for zone 2 and zone 3. The only change
in LED status will be ZD2 LED will light for zone 2
and ZD3 LED will light for zone 3.
9. Once the ventilation test is completed, and the
zone thermostat fan modes are set to Auto, place
zone 1 thermostat in the cooling mode and adjust
the setpoint above the space temperature until it
calls for cooling. Keep in mind that the zone
thermostat may have a time delay and that the
panel has a 3 minute short cycle time delay before
allowing the equipment to come on. Once the
cooling cycle is energized, the following panel
LEDs should be lit:
24V
Y1
G
O/B (If reversing valve = O cooling)
LIMIT
ZD1
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