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ZONE THERMOSTAT CONTROL RELAYS — A unique
feature of the Aquazone system control panel is the capability to
add zone thermostat control relays. This feature is used when the
Aquazone system control panel is utilized in a stand-alone type
of installation. Either a set of 10 or 18 relays can be selected
from the 50RLP model nomenclature in digit 9 to control either
10 or 18 zones, respectively. If selected in the model nomencla-
ture, zone control relays are located on the right hand side of the
system control panel. See Fig. 4. See Fig. 5A-5C for wiring.
CONTROL TRANSFORMERS — Control transformers are
supplied with the Aquazone system control panel and are wired
to the power switch and convenience outlet. The control
transformers provide power to the nominal 24 VAC circuit in
Aquazone system control panel. The contractor will supply the
primary power to the power switch and convenience outlet in
the field. Transformers include a manual reset button for reset-
ting the circuit breaker. Control transformers are located on the
bottom half of the system control panel. Specifications for the
control transformers are as follows:
Primary: 120/208/240 vac
Secondary: 24 vac
Frequency: 60 Hz
MOUNTING RAILS AND WIRING DUCT — All exposed
panel wiring is low voltage. Line voltage wiring to the control
transformers, control circuits for pumps, cooling tower fans,
and boilers is factory-installed in conduit, using wiring duct,
and on mounting rails.
RYW OGC
COMPLETE C CONTROL
(IN WSHP)
R
G
W1
C
Y1
W2
Y2
THERMOSTAT
SYSTEM
ZONE
RELAYS
(1-18)
NO
PANEL 24 VAC POWER
SYSTEM ZONE
RELAYS
(1-18)
TO OTHER WSHP COMPLETE C CONTROLS AND THERMOSTATS
TYPICAL
FIELD-INSTALLED
RELAYS
(ONE PER WSHP)
N
H
RYW OGC
COMPLETE C CONTROL
(IN WSHP)
R
G
W1
C
Y1
W2
Y2
THERMOSTAT
H
O
A
STARTER
COIL
M
CONTROL RELAY
OR
STAGING CARD
TP WIRES
SWITCH S-1
FIRE
FREEZE,
ETC.
(-)
(+)
TO COMFORT
CONTROLLER
L
OL’
s
X2
X1
Fig. 5A — System Zone Relay Wiring
(Aquazone™ System Control Panel Used to
Control a Single Thermostat)
Fig. 5B — System Zone Relay Wiring
(Aquazone System Control Panel Used to Control Multiple Thermostats)
Fig. 5C — Control Relay Wiring for Pump
Start/Stop or Cooling Tower Fan