22
NSZ/NDZ INSTALLATION MANUAL
OPERATION LOGIC
HEATING
COOLING
FAN ON
SL1 - IN
ON
SL2 - IN
ON
STG1
STG2
STG3
EMERG
STG1
STG2
SINGLE SPEED UNITS
Compressor
On
On
On
Off
On
On
-
-
-
Rev Valve
Off
Off
Off
Off
On
On
-
-
-
Loop Pump
On
On
On
Off
On
On
-
On
-
DHW Pump
On
Off
Off
Off
On
On
-
-
-
Secondary 1- Out
On
On
On
Off
On
On
-
-
-
Emerg LED
Off
Off
Off
On
Off
Off
Off
-
-
T-Stat Signal
Y1
Y1, Y2
Y1, Y2, W
W
Y1, O
Y1, Y2, O
G
-
-
DUAL CAPACITY UNITS
Compressor-Lo
On
Off
Off
Off
On
Off
-
-
-
Compressor-Hi
Off
On
On
Off
Off
On
-
-
-
Rev Valve
Off
Off
Off
Off
On
On
-
-
-
Loop Pump
On
On
On
Off
On
On
-
On
-
DHW Pump
On
On
Off
Off
On
On
-
-
-
Secondary 1- Out
On
On
On
Off
On
On
-
-
-
Secondary 2- Out
Off
On
On
Off
Off
On
-
-
-
Emerg LED
Off
Off
Off
On
Off
Off
-
-
-
T-Stat Signal
Y1
Y1, Y2
Y1, Y2, W
W
Y1, O
Y1, Y2, O
G
-
-
Operation Logic Data
DIP SWITCH
NUMBER
DESCRIPTION
OFF POSITION
ON POSITION
SW1
N/A
NOT USED
N/A
N/A
SW2
1
Service/Test Mode -
Allows control of “NORM” or “TEST” operational
modes. Test mode accelerates most timing functions 16 times to allow
faster troubleshooting. Test mode also allows viewing the “CURRENT”
status of the fault inputs on the LED display.
Test
Norm
2
Freeze Detection Temperature Limit (Water Flow)
This lockout mode occurs when the freeze detection thermistor temperature is at
or below the selected point (well 30°F or loop 15°F) for 30 continuous seconds.
Loop
(Protection 15° F)
Well
(Protection 30° F)
3
Accessory Relay
Allows field selection of the accessory relay to operate with the compressor
or fan.
Fan
Comp
4
NOT USED
N/A
N/A
5
NOT USED
N/A
N/A
6
Input Diagnostics -
Allows viewing the inputs from the thermostat to the
control board such as Y1, Y2, O, G, W, SL1-In on the LED display.
Diagnostic Inputs
viewed at LEDs
Normal Display
viewed at LEDs
7
Output Diagnostics -
Allows viewing the outputs from the control board
such as the compressor, reversing valve, blower, hot water pump, and loop
pump on the LED display.
Diagnostic
Outputs viewed at
LEDs
Normal
Display viewed
at LEDs
8
Thermostat Selection
Configures the control for a pulsed lockout signal (ComforTalk and
FaultFlash thermostats) or continuous 5 VAC lockout signal.
Pulsed “L”
signal
Continuous “L”
signal
SW3
1
Single or Dual Capacity Operation
Dual Cap
1 Speed
2
Zoned/Finish on Second Stage
This switch allows the unit to down stage with the thermostat when off and
finish with second stage when on. Finish on second stage reduces stage
changing in reciprocating dual capacity compressors.
Normal -
All other systems
Finish on 2nd
Unzoned Dual
Capacity
E-Series or
Premier 2 speed
3
ECM Fan Monitoring - Set for No PRM on split systems
No RPM
RPM
4
NOT USED
N/A
N/A
5
On dual capacity units this switch allows stage change: on the fly when off,
and 1 minute delay when on. A delay is required on all reciprocating dual
capacity units.
Envision
E-Series or Premier
DIP Switch Settings
