Field Wiring - Weil-McLain CGi Series 3 Installation And Maintenance Manual

CG i
GAS- FIRED wATER BOILER- sERIEs a -
Boiler Manual
6
Field wiring
I&
WARNING!
NOTICE
For your safety, tum off electrical power supply
at
service entrance panel before making any
electrical connections to avoid possible electric
shock hazard. Failure to do so can cause severe
personal injury or death.
Wiring must be N. E.C. Class 1.
If original rollout thermal fuse element wire as
supplied with boiler must be replaced, use only
type
200'C
wire or equivalent. If other original
wiring as supplied with boiler must
be replaced,
type
105'C
wire or equivalent must be used.
Boiler must be electrically grounded as required
by National Electrical Code ANSI/NFPA 70 -
latest edition.
Electrical installation must comply
with:
1. National Electrical O>de and any other national, state, pro-
vincial or local codes or regulations.
2.
In Canada, CSA C22.1 canadian Electrical Code Part 1, and
any local codes.
Wiring connections
Boiler is shipped with controls completely wired
Thermostat
1. Connect thermostat as shown
on wiring diagram on boiler.
2.
Install on inside wall away from influences of drafts, hot
or cold water pipes, lighting fixtures, television. sun rays,
or fireplaces.
3.
If thermostat has a heat anticipator, set heat anticipator in
thermostat to match power requirements of equipment con-
nected to it. 1f connected directly to boiler, set for 0.1 amps
plus gas valve current. See infom1ation on wiring diagram
as shown in Figure 32, page 39. For other devices, refer to
manufacturer's specifications. Wiring diagram on boiler gives
setting for control module and gas valve. Also see instructions
with them1ostat.
DHW
1. O>nnect
DHW
aquastat as shown in wiring below. Economy
ftmction isn't utilized with DHW input.
Junction Box (furnished)
1.
O>nnect 120 V AC power wiring as shown in Figure 27.
2. Fused disconnect or service switch {15 amp. recommended)
may be mounted on this box. For those installations with
local codes which prohibit installation of fused disconnect
or service switch on boiler, install a
2
x
4
cover plate on the
boiler junction box and mount the service switch remotely
as required by the code.
Wiring multiple zones
Refer to zone valve manufacturer's literature fo r wiring and ap-
plication. A separate
transfom~er
is required to power zone valves.
Zoning with circulators requires a relay for each circttlator.
IACAUTIDNI
DO NOT
connect directly from 3-wire zone
valve.s to the T-T terminals on the
boiler.
When using 3·wire zone valves, install an isolation
relay. Connect the zone valve end switch \vires to
the isolation relay coil. Connect the isolation relay
contact across the boiler T-T terminals. Failure to
comply can result in damage to boiler components
or cause unreliable operation, resulting in severe
property damage.
NOTICE
The CGi control module is polarity-sensitive. The hot and neutral wires must be cOJmected to the correct leads.
A flashing POWER light usually indicates reversed polarity of 120 VAC lead wires.
Figure 27
Field w1r1ng connec-
tions -
service switch, DHW
(If used) and
thennostat
(or end switch)
provided by Installer
t
120VAC A
Hoc
"TT'
Neutral
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Thermostat
or end swich
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