Carrier AQUAZONE 50PSW036-360 Installation And Service Instructions Manual page 17

Deluxe D Control Accessory Relay Configura-
tions (See Tables 4 and 5) -- The
following acces-
sory relay settings are applicable
for Deluxe D control only:
CYCLE WITH COMPRESSOR -- In this configuration, the
relay will be ON any time the compressor relay is on.
DIGITAL NIGHT SETBACK (NSB) -- In this configura-
tion, the relay will be ON if the NSB input is connected to
ground C.
NOTE: If there are no relays configured for digital NSB, then
the NSB and OVR inputs are automatically configured for
mechanical operation.
MECHANICAL NIGHT SETBACK -- When NSB input is
connected to ground C, all thermostat inputs are ignored. A
thermostat setback heating call will then be connected to the
OVR input. If OVR input becomes active, then the Deluxe D
control will enter night low limit (NLL) staged heating mode.
The NLL staged heating mode will then provide heating during
the NSB period.
WATER VALVE (SLOW OPEN1NG) -- If relay is config-
ured for water valve (slow opening), the relay will start 60 sec-
onds prior to starting compressor relay.
To avoid equipment damage, DO NOT leave system filled
in a building without heat during the winter unless anti-
freeze is added to system water. Condenser coils never
fully drain by themselves and will freeze unless winterized
with antifreeze.
Table 4 -- DIP Switch Block $2 --
Accessory 1 Relay Options
ACCESSORY 1 DIP SWITCH POSITION
RELAY OPTIONS 1 2 3
Digital NSB Off On On
Water Valve -- Slow Opening On Off On
LEGEND
NSB -- Night Setback
NOTE: All other DIP switch combinations are invalid,
Table 5 -- DIP Switch Block $2 --
Accessory 2 Relay Options
ACCESSORY 2 DIP SWITCH POSITION
RELAY OPTIONS 4 5 6
Digital NSB Off On On
Water Valve -- Slow Opening On Off On
LEGEND
NSB -- Night Setback
NOTE: All other DIP switch combinations are invalid,
START-UP
Use the procedure outlined below to initiate proper unit
start-up.
NOTE: This equipment is designed for indoor installation
only.
Operating Limits (See Table 6)
ENVIRONMENT- This equipment is designed for indoor
installation ONLY. Extreme variations in temperature, humidi-
ty and corrosive water or air will adversely affect the unit per-
formance, reliability and service life.
POWER SUPPLY- A voltage variation of+ 10% of name-
plate utilization voltage is acceptable.
UNIT STARTING CONDITIONS -- All units start and op-
erate in an ambient of 45 F with entering air at 40 F and enter-
ing water at 20 F.
NOTE: These operating conditions are not normal or continu-
ous operating conditions. It is assumed that start-up is for the
purpose of bringing the building space up to occupancy
temperature.
When the disconnect switch is closed, high voltage is
present in some areas of the electrical panel. Exercise cau-
tion when working with the energized equipment.
Table 6 -- 50PSW Unit Operating Limits
WATER LIMITS COOLING HEATING
(F) (F)
SOURCE COIL
Min Entering Water 50 20
Normal Entering Water 85 60
Max Entering Water 110 70
LOAD COIL
Min Entering Water 50 60
Normal Entering Water 60 100
Max Entering Water 90 120
Unit Start-Up
1. Turn off all power to unit.
2. Adjust all valves to full open position.
3. Restore power to unit.
4. Operate each unit in the cooling cycle. See Table 6 for
unit entering water temperatures.
5. Operate each heat pump in the heating cycle ilranediately
after checking cooling cycle operation.
NOTE: A time delay will prevent the compressor from
re-starting for approximately 5 minutes. The time delay
function can be ovemdden on the Complete C control
board.
6. If unit fails to operate, perform the following system
checks:
a. Check the voltage and current. Be sure they com-
ply with electrical data on unit nameplate.
b. Check for loose terminal screws where wire con-
nections have been made on both the line and low-
voltage terminal boards.
c. Check the supply and return piping. Be sure they
are properly connected to the inlet and outlet con-
nections on the unit.
d.
If the checks described above fail to reveal the
problem and the unit still will not operate, contact
a trained service technician to ensure proper
diagnosis.
Scroll Compressor Rotation
--
It is important to be
certain compressor is rotating in the proper direction. To
determine whether or not compressor is rotating in the proper
direction:
1. Connect service gages to suction and discharge pressure
fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge
pressure should rise, as is normal on any start-up.
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