420-Volt Operation - Carrier AQUAZONE 50HQP072-120 Installation And Service Instructions Manual

Determine percent voltage imbalance.
% Voltage Imbalance = 100 x
= 0.95%
This amount of phase imbalance is satisfactory as it is
below the maximum allowable 2%.
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to electri-
cal components.
4
421
Water Automatic
Control Balance Valve
Valve
Pressure-
Temperature
Plugs
Fig. 11 — Typical Ground-Water Piping Installation
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
maximum power handling is 4 amps at 240 volts. The pumps
will automatically cycle as required by the unit.
420-VOLT OPERATION — All 380/420 volt units are factory
wired for 380 volts. The transformers may be switched to
420-volt operation (as illustrated on the wiring diagram) by
disconnecting the VIO lead at L1 and attaching the BRN lead
to L1. Close open end of VIO lead.
Expansion
Tank
Strainer – Field-Installed Accessory
(16 to 20 mesh recommended for
filter sediment)
Boiler
Drains
9
Water Out
Water In
From Pump
Shut-Off
Valve
a50-8542