21
21
2
(NOTE 2)
2. VENT DAMPER REQUIRED ON ALL BOILERS EXCEPT CWI311 - CWI380. WHEN DAMPER IS
NOT USED, DAMPER HARNESS IS OMITTED AND TERMINAL B1 IS WIRED DIRECTLY TO FRS.
AS SHOWN IN LADDER DIAGRAM
HIGH LIMIT
LOW
LIMIT
HONEYWELL
L8124E
LESS VENT
DAMPER
TH
TR
+
ROBERTSHAW
7000DERHC
GAS VALVE
(CWI380)
HONEYWELL
VR8204/VR8304
SERIES GAS VALVES
(CWI103 - 346)
PILOT VALVE
MAIN VALVE
FIGURE 19: WIRING DIAGRAM, INTERMITTENT IGNITION (EI) SYSTEM WITH TANKLESS HEATER
Wiring Variations
1)
Multiple Circulator Zones – Figure 20 shows wiring for two or more circulator zones using Honeywell R845As. One R845A
is required for each circulator zone. Circulator terminals “C1” and “C2” on the limit control are not used. A DPST Honeywell
RA832A may be substituted in place of the R845A using the “X” and “X” terminals in place of the “5” and “6” terminals on
a R845A.
A call for heat from any thermostat will energize the DPST relay in that zone’s R845A. When this relay is energized,
electrical continuity is created between terminals 3 and 4, energizing the circulator for that zone. At the same time, electrical
continuity is created between terminals 5 and 6 on the R845A, creating a current path from terminal “T” to “TV” on the limit
control. Assuming that the supply water temperature is below the high limit setting, the normal ignition sequence will be initi-
ated.
2) Multiple Zones using Zone Valves – Figure 21 shows wiring for multiple zones using Honeywell V8043F zone valves. This
wiring diagram may be used for other 24-volt zone valves as long as they are equipped with end switches. Do not attempt
to use the transformer on the limit control to power the zone valves; use a separate transformer. Up to five V8043Fs may be
powered by one 48VA transformer, such as the Honeywell AT87A.
A call for heat from a given thermostat will result in the application of 24 volts across the TH and TR terminals on the cor-
responding zone valve, energizing the zone valve motor. The zone valve opens and the end switch contacts are then made.
The end switches are connected in parallel with each other and to the “T” and “TV” thermostat connections so that any zone
valve that opens will also start the circulator and fire the boiler (assuming the high limit is not open). Zone valve terminal TH/
TR has no internal connection on the zone valve; it is merely a “binding post” used to connect two or more wires.
Содержание CWI103
Страница 2: ......
Страница 17: ...15 15 FIGURE 12 INDIRECT WATER HEATER BOILER SIDE PIPING FIGURE 11 STANDARD BOILER PIPING ...
Страница 19: ...17 17 FIGURE 15 BOILER PIPING WITH CHILLER FIGURE 14 ISOLATION OF BOILER FROM SYSTEM WITH A HEAT EXCHANGER ...
Страница 29: ...27 27 FIGURE 24a GAS VALVE DETAIL HONEYWELL VR8204 AND VR8304 FIGURE 24b GAS VALVE DETAIL ROBERTSHAW 7000DERHC ...
Страница 34: ...32 32 Notes ...
Страница 41: ...39 39 Notes ...
Страница 43: ...41 41 ...
Страница 45: ...43 43 ...
Страница 47: ...45 45 ...
Страница 49: ...47 47 FIGURE A1 BASE HEAT EXCHANGER FLUE COLLECTOR ASSEMBLY ...
Страница 51: ...49 49 FIGURE A2 JACKET INSTALLATION ...
Страница 53: ...51 51 FIGURE A3 TAPPING LOCATIONS SEE TEXT FOR TAPPING USES ...
Страница 54: ...52 52 Notes ...
Страница 55: ...53 53 Notes ...