ECR International CHB Application Manual page 14

E. Multi-Zone Pump System Using Argo ARM
Controller:
1 - If Indirect Storage Tank IS NOT applied to a multi-zoned
piping system:
• Boiler thermostat contacts (Key 72) are wired to
Argo ARM Zone Pump Control Terminals (X-X)
• Zone thermostats and zone pumps are wired to
ARGO Controller
• Priority Switch OFF
• CH Heating only
• See Wiring Figure 9
2 - If Indirect Storage Tank IS applied to multi-zoned pump
piping assembly:
A. Tank sensing element is applied to boiler terminal
strip 7 & 8 (Key 155).
• Set Argo priority switch "OFF" if
Zone 1 Priority IS NOT used.
Set Argo priority switch "ON" if Zone 1 Priority IS
used.
• See wiring Figure 10
• DHW circuit is controlled by boiler control and is
Priority heat demand.
B. Storage tank mechanical thermostat is wired across
zone 1 Priority contacts of Argo Control (Tw/Tr).
• Apply Resistor Kit (550003082). Resistor Kit
includes resistor wire harness and isolation relay
(24 Vac).
• Set Argo priority switch ON - DO NOT operate in
"OFF" position.
• See wiring Figure 11
• DHW circuit is Priority heat demand and is
controlled by Argo ARM Zone Control.
CHB - WIRING DIAGRAM
Important:
• Before connecting to Key 72 Terminals, remove jumper on
terminal block.
• Before connecting Low Water Cutoff remove jumper on
terminal block. (Key 370)
14
NOTICE
PN 240011074 REV C, [11/01/2017]