Carrier AQUAZONE 50PSW036-360 Installation And Service Instructions Manual page 15

L_ _r k rx_%, 1
Contactor -CCl Contactor -CC2
Grnd
Po_%_g,b,.,on Tran_f ...... ]
_2
_c
33
C Control #1
g_
_o
[ J
C Control #2
Fig. 12 -- Typical Field Wiring
SUPPLY VOLTAGE- Operating voltage to unit must be
within voltage range indicated on unit nameplate.
Voltages between phases must be balanced within 2%.
Use the following formula to determine the percentage voltage
imbalance:
% Voltage Imbalance
= 100 x max voltage deviation from average voltage
average voltage
Example: Supply voltage is 460-3-60.
A B C
AB = 452-v
BC = 464-v
AC = 455-v
Average Voltage = 452 + 464 + 455
3
1371
3
= 457
Determine maximum deviation from average voltage:
(AB) 457 - 452 = 5-v
(BC) 464 - 457 = 7-v
(AC) 457 - 455 = 2-v
Maximum deviation is 7-v.
Determine percent voltage hnbalance.
7
% Voltage hnbalance = 100 x 45----5-
= 1.53%
This amount of phase hnbalance is satisfactory as it is
below the maximum allowable 2%.
Operation on hnproper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to electri-
cal components.
NOTE: If more than 2% voltage imbalance is present, contact
local electric utility.
EXTERNAL LOOP POWER CONNECTION -- If the unit
is to be connected to an external loop pump or flow controller,
connect the pump to the loop pump terminal block PB1. The
maxilnum power handling is 4 amps at 240-v. The pumps will
automatically cycle as required by the unit.
208-V OPERATION--All 208/240-v units are factory
wired for 208-v. The transformers may be switched to 240-v
operation (as illustrated on the wiring diagram) by switching
the red (208-v) wire with the orange (240-v) wire at the L2
terminal.
460-VOLT OPERATION--Units using 460-v and internal
secondary pump will require a neutral wire from the supply
side in order to feed accessory with 265-v.
Step 7 -- Wire Low Voltage Connections
THERMOSTAT CONNECTIONS
The thermostat should be wired directly to the Aquazone
TM
control board. See Fig. 4-9.
WATER FREEZE PROTECTION -- The Aquazone control
allows the field selection of source fluid freeze protection
points through jumpers. The factory setting of julnper JW3
(FP1) is set for water at 30 E In earth loop applications, julnper
JW3 should be clipped to change the setting to 10 F when
using antifreeze in colder earth loop applications. See Fig. 13.
) BR BRG CCG CC
Clip JW3
protection s,_ _ _:P_,
Lo*T,,_
Clip
for dry
contact
O
Y
©
P2
12
©
P3
=gg
©
Fig. 13 _ Typical Aquazone Control Board
Jumper Locations (Complete C Control Shown)
ACCESSORY CONNECTIONS- The terminal labeled A
on the control is provided to control accessory devices such as
water valves, electronic air cleaners, humidifiers, etc. This sig-
nal operates with the compressor terminal. See Fig. 14. Refer
to the specific unit wiring schematic for details.
Terminal Strip
{C)v +
v
Typical
Water
Valve
Fig. 14 -- Typical Aquazone Accessory Wiring
(Deluxe D Control Shown)
NOTE: The A terminal should only be used with 24-v signals,
not line voltage signals.
IMPORTANT: Two-compressor units with Complete C or
Deluxe D controls wired to terminal A will be turned off if
the controls are in lockout mode, even if the other board is
in normal operating mode.
15