6
Figure 24
Field wiring
connections —
service switch and thermostat
(or end switch)
provided by installer
The CGt control module is polarity-sensitive. The hot and neutral wires must be connected to the correct leads.
A flashing
POWER
light usually indicates reversed polarity of 120VAC lead wires.
29
Part Number
550-110-290/0219
CGt
GAS-FIRED WATER BOILER — Series 2 —
Boiler Manual
For your safety,
turn 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 Code, ANSI/NFPA 70 – latest edition.
and any other national, state, provincial 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. You must con-
nect the
ambient temperature switch
wires (page 3, item 10) to
the switch after the boiler is in place. See page 6 for switch location
and mounting. The factory-supplied wires are 4-feet long. Splice
additional wire if needed.
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, sunrays, or
fireplaces.
3. If thermostat has a heat anticipator, set heat anticipator in
thermostat to match power requirements of equipment con-
nected to it. If connected directly to boiler, set for 0.1 amps
plus gas valve current. See information on wiring diagram
as shown in Figure 28, page 35. For other devices, refer to
manufacturer’s specifications. Wiring diagram on boiler gives
setting for control module and gas valve. Also see instructions
with thermostat.
Junction Box (furnished)
1. Connect 120VAC power wiring as shown in
Figure 24
.
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 for wiring and ap-
plication. A separate transformer is required to power zone valves.
Zoning with circulators requires a relay for each circulator.
DO NOT connect directly from 3-wire zone
valves to the T-T terminals on the boiler
.
When using 3-wire zone valves, install an isolation
relay. Connect the zone valve end switch wires 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.
Field wiring
