resideo Honeywell Home Aquastat L7224A Notice D'installation page 12

Régulateurs électroniques pour chaudières électriques et à mazout
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L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT
System
Diagnostic
Condition
Condition
Boiler is hot,
Display is ON.
house is cold.
Boiler is hot,
Display is ON.
no hot
potable water.
ZONE 2
CIRCULATOR
R845A RELAY ZONE 2
1
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
CONTROL CASE MUST BE CONNECTED
TO EARTH GROUND. USE GROUNDING
SCREW PROVIDED.
68-0281EFS—09
Table 11. Troubleshooting Guide (Continued)
120 Vac at C1-C2
Boiler below the Low Limit
temperature, wait for boiler to
go above Low Limit
temperature.
Boiler above LL? If yes, check for
120 Vac between ZC and L2.
ELL setting (L7248L only)
Boiler above LL? If yes, check
120 Vac at ZR-L2 (only L7248L
with ELL set On)
Boiler Demand signal from the
water heater (either 120 Vac at
ZR-L2, or 0 Vac on T-T; depends
on installation and "duu"
setting)
"duu" setting
Check DHW Module and DHW
Sensor
TO ADDITIONAL R845A
RELAYS FOR OTHER ZONES
6
5
3
4
1
2
ZONE 2
LOW VOLTAGE
THERMOSTAT
Fig. 9. L7224A,C multizone system with circulator connections.
Check
• 120 Vac at C1-C2, check wiring to pump.
• Wiring OK, is pump running?
• If not, replace the pump.
• If pump is running, check for trapped air
• If no 120 Vac, replace control.
• If yes, check zone relays, circulators and
• Set ELL to Off for multizone system (see
• Set ELL to On for External Low Limit (see
• If no 120 Vac, check C1-C2 (see above).
• If yes, check the External Low Limit
• 24 Vac on T-T (or 0 Vac on ZR-L2), check
• Wiring OK, check the water heater
• Set duu to ON if 120 Vac water heater
• Set duu to OFF if open/closed water
• DHW Module not properly connected
1
L1
L7224
L2
(HOT)
SENSOR
ZR
L1
LINE
VOLTAGE
L2
CIRCULATOR
C2
B2
C1
LINE
VOLTAGE
B1
OIL BURNER
RELAY
ZC
12
®
CONTROLLERS
Action
or closed zone valves.
wiring.
Fig. 11).
Fig. 13).
control.
wiring to water heater
demand is connected to ZR
heater demand is connected to T-T
and/or DHW Sensor improperly
positioned
LOW
VOLTAGE
THERMOSTAT
2
T
T 3
2
1
M27115

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