Honeywell Y343B1002 - Manual (Page 4)

TABLE 1—GAS CONTROLS.
MODEL NO.
TYPE OF PRESSURE
REGULATOR
CAPACITY RANGE OF
STANDARD MODEL PUBLICATION FORM
NUMBER cfh mVhr
V845A Standard noto 335 3.1 to 9.5 60-2315
VR8450A Standard noto 290 3.1 to 7.8 68-0016
V845C Step-open noto 335 3.1 to 9.5 60-2315
VR8450C Step-open noto 290 3.1 to 7.8 68-0016
VR8540A Two-stage noto 290 3.1 to 7.8
68-0021
VR8590A Negative 37 to 400 I.Oto 11.3 68-0017
VR8600A Negative 37 to 400 I.Oto 11.3 68-0017
AUXILIARY CONTROLS
REQUIRED FOR BASIC DSI SYSTEM
1. TRANSFORMER. Select transformer with ade­
quate VA. S87D requires a 24 Vac 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 Vac thermostat for single-stage or
two-stage burner control (depending on heating sys­
tem).
DETERMINED BY PARTICULAR APPLICATION
Refer to separate publications for information on the
controls utilized by the appiiance manufacturer. These
controis are:
1. High iimit temperature controlier and other safety
controis as required.
2. Gas vaive. Refer to Tabie 1 above.
3. Alarm signal as desired for the circuit under
control of the S87D.
CAUTION
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.
INSTALLATION
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.
CAUTION
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 Q347 may be mounted
on a separate bracket or on the same bracket with the
Q354A Flame Sensor. On multiple burners, the 0347
may be mounted at one end of the row and the 0354 at
the other end to delay spark cutoff until all burners are
ignited.
IMPORTANT-
The ignition cable limits the distance between the
0347 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
object or current-carrying wires.