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TABLE l-GAS
CONTROLS.
MODEL NO.
V845A
VR8450A
V845C
VR8450C
VR8540A
VR8590A
VR8600A
TYPE OF PRESSURE
REGULATOR
Standard
Standard
Step-open
Step-open
Two-stage
Negative
Negative
CAPACITY
RANGE OF
STANDARD
MODEL
cfh
mJ/hr
110to335
3.1 to 9.5
110to290
3.1 to 7.8
11oto335
3.1 to 9.5
110to290
3.1 to 7.8
110to290
3.1 to 7.8
37 to 400
1.oto 11.3
37 to 400
1.oto11.3
PUBLICATION
FORM
NUMBER
60-2315
68-0016
60-2315
68-0016
68-0021
68-0017
68-0017
AUXILIARY CONTROLS
REQUIRED
FOR BASIC DSI SYSTEM
1. TRANSFORMER.
Select
transformer
with
ade-
quate
VA. S87D requires
a 24 Vat
transformer.
For
common
system transformers,
capacity
must be ade-
quate for S87D, temperature
controller,
gas control and
any
other
device
powered
by the transformer
(see
Table 2).
2. LOW VOLTAGE TEMPERATURE
CONTROLLER.
Select
a
24
Vat
thermostat
for
single-stage
or
two-stage
burner
control
(depending
on heating
sys-
tem).
DETERMINED
BY PARTICULAR
APPLlCATiON
Refer to separate
publications
for information
on the
controls
utilized
by the appliance
manufacturer.
These
controls
are:
1. High limit temperature
controller
and other safety
controls
as required.
2. Gas valve. Refer to Table 1 above.
3. Alarm
signal
as desired
for the circuit
under
control of the S87D.
1. When using a common
transformer
to power
both S87D and gas control
circuit, use a good
quality
transformer
of adequate
VA. If trans-
former
VA is inadequate,
the S87D internal
relay may chatter.
2. When two or more transformers
are used, they
must be properly
phased and grounded.
;NSlAL~~lON
*
I
WHEN INSTALLING
THIS IGNITION PACKAGE.
. .
1. Read these instructions
carefully.
Failure to follow
them could damage
the product
or cause a hazardous
condition.
2. Check the ratings given in the instructions
and on
the
product
to
make
sure
it is suitable
for
your
application.
3. The
installer
must
be a trained,
experienced
service technician.
4. After installation
is complete,
check out system
operation.
1. Disconnect
power supply before wiring to pre-
vent electrical
shock or equipment
damage.
2. If a new gas control
is to be installed,
turn off
gas supply before starting
installation.
Be sure
to conduct
a Gas Leak
Test after
the gas
control
is
installed
(follow
manufacturer's
instructions).
IMPORTANT
If this is a replacement
application,
follow
the
appliance
manufacturer's
instructions.
The manu-
facturer
usually
provides
wiring
diagrams,
start-up
and checkout
instructions
and service
procedures
for their
system.
If manufacturer's
instructions
are
not available,
the
information
below may be used as a general guide.
S87D CONTROL MODULE
Select a location
within 30 in. [762 mm] maximum
of
the burner
that will permit
a direct
cable route to the
Q347A spark igniter.
Ready access to the terminals
is
necessary
for wiring and servicing.
Do not exceed
the
ambient
temperature
rating
given
in the
SPECIF-
ICATION section.
The S87 may be mounted
in any position.
See Fig. 1
for mounting
dimensions.
Use No. 6-32 machine screws
or No. 8 sheetmetal
screws
1 in. long for fastening.
Fasten securely.
Q347A SPARK IGNITER-SENSOR
The Q347A
should
be rigidly
mounted
in an ac-
cessible
location.
It must remain
in a fixed
position
relative
to the main burner. The CT347 may be mounted
on a separate
bracket
or on the same bracket with the
Q354A Flame Sensor.
On multiple
burners,
the Q347
may be mounted
at one end of the row and the Q354 at
the other end to delay spark cutoff until all burners
are
ignited.
Q347 and S87 to 30 in. [762 mm] or less. This may
affect the location
selected
for the 0347 and/or
S87.
Ignition
cable
must
not touch
grounded
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