SECTION 15: W
IRING
67 of 91
15.7 System Control Methods and External
Multiburner Wiring
There are several methods of controlling CTHN-
Series systems. The options are as follo
w
s:
15.7.1 SPST Transformer Relay (P/N 90417600K)
The transformer relay
w
iring diagram is sho
w
. The transformer relay can be
u
sed to control an EP-100 or EP-201 p
u
mp CTHN
system. The single pole relay can only be
u
sed to
control one zone of b
u
rners.
The electrical circ
u
it is a 120V AC (20 A) s
u
pply.
The transformer 24V AC o
u
tp
u
t for the thermostat is
rated at 40VA. Thermostats
u
sed
w
ith the
transformer m
u
st not exceed this po
w
er req
u
irement.
A transformer relay operated system
w
ill not give any
post p
u
rge p
u
mp operation to completely exha
u
st
prod
u
cts of comb
u
stion from the system or provide
indication of operating conditions.
15.7.2 SPDT Transformer Relay (P/N 90436300)
The transformer relay
w
iring diagram is sho
w
. The transformer relay can be
u
sed to control an EP-100 or EP-201 p
u
mp CTHN
system. The do
u
ble pole relay can only be
u
sed to
control t
w
o zones of b
u
rners.
The electrical circ
u
it is a 120V AC (20 A) s
u
pply.
The transformer 24V AC o
u
tp
u
t for the thermostat is
rated at 40VA. Thermostats
u
sed
w
ith the
transformer m
u
st not exceed this po
w
er req
u
irement.
A transformer relay operated system
w
ill not give any
post p
u
rge p
u
mp operation to completely exha
u
st
prod
u
cts of comb
u
stion from the system or provide
indication of operating conditions.
