Honeywell NAHA003WK01 Installation Instructions Manual
Tuesday 29 of SOD 1998. Faxination ->5123390477 Page 2 o£ f
INSTALLATION
INSTRUCTIONS
_ t /ll L'I //I
Twinning Kit NAHA003WK01
For Use With Furnace Models Using
Honeywell ST9120 Electronic Fan Controls
Please read these instructions completely before attempting installation.
Electrical shock hazard/Fire and/or explosion
hazard.
Turn off electric power supply at disconnect
switch or service panel before starting instal-
lation.
Turn off gas supply at field installed manual
gas valve before starting installation.
Failure to follow this warning can result in
property damage, p_rsonal Injury and/or
death.
Installation or repairs made by unqualified per-
sons can result In hazards to you and others.
Installation MUST conform with local building
codes or, In the absence of local codes, with
the National Fuel Gas Code NFPA 54/ANSI
A223.1,1990 or latest edition. In Canada, Na-
tional Standard CAN/CGA B149-t.
The information contained in this manual is in-
tended for use by a qualified service techni-
cian familiar with proper safety procedures
and equipped with the proper tools and test
instruments.
Failure to carefully read and follow all Instruc-
tions in this manual can result In furnace real-
function, property damage, personal injury
and/or death.
This"tw_nning kit is intended to permit two identical gas
furnaces to be installed.connected to the same duct work
Air conditioning can be added by using one air conditioning
evaporator coil sized for the total air flow capabilities of the
two furnaces.
Single and Two Stage Heating
Single or two stage heating is obtainable using twinning kit
NAHA003WK01. Follow the instructions located in the
Twinning Kit Installation section for proper hookup of desired
thermostat staging.
Furnace Installation
Refer to the Installation Instructions packed with the
furnaces for information about clearances, start-up and
maintenance, gas piping and vent installation.
CAUTION
Furnaces installed MUST be identical. They
may be installed on a raised platform or wood
floor which MUST be level. When side return
is required, separate return air drops MUST
be madeto both furnaces. Do not use rear of
furnace for the return air duct connection.
CAUTION
Make sure blower motors are wired to
operate on the same speed tap.
CAUTION
Two furnaces must be plumbed with a single
supply gas shut off valve.
NOTE: When twinning kit has been installed, locate the
adhesive backed wiring diagram included in the kit and apply
next lo Ihe existing wiring diagrams in the furnaces.
TWINNING KIT INSTALLATION
The twinning kit contains (2) 36" wires of two differenl colors
to interconnect the electronic fan controls of the two
furnaces. For proper operation, and to avoid damage to
the controls, be sure to match Z1 to Z1 and Z2 to Z2 on
each fan control (see Figure 1) The wires are color coded
to assist with this connection. Each wire is factory
terminated with a specia_ crimped edge connector which wi_
push into mating connection positions on the edge of the
circuit board on each fan con:roL The length of these wires
can be extended by cutting and splicing sufficient additional
wire to each lead.
An isolation relay is provided to protect the system s
thermostat from possible overloading due to the combined
valve end control load of the two appliances.
Printed in U,S,A. 441 06 1003 01 (2;98)
replaces 441 06 1003 00 (10,97
Tuesday 29 o£ Sep 1998. Faxination ->5123390477 Page 3 o£
Installation Procedures
I Remove line power from both appliances before
starting installation of the twinning kit.
2 Locale the Zl and Z2 connectic^s along one edge of
each control (see Figure 1). The demgnalions are
printed on top of the circuit board, and a black bar
shows the correct orientation of the metal body which
will be pust_ed in to make connection.
3 Remove furnace casing hole plugs and route the
[winning leads through bushings provided as required,
and lengthen if necessary by splicing. Be sure to
observe the polarity required so as lo match Z1 to Z1
and Z2 to Z2 (see Figure 2).
4. Push the terminal into the slot on the circuit board
edge. Be sure to align the body with the black bar to
line up the solder finger below the circuit board (see
Figure 1). The terminal will "bite into" the solder and
make the necessary connection. Repeat for each end
of both wires.
5 Locale and mount the isolation relay in the circulating
blower compartment on the same panel as the
electronic fen control in furnace #1 (see Figure 1).
6, Refer to single stage or two stage thermostat wiring as
noted below.
Single Stage Thermostat Operation
Reference Figure 3
1 Interconnect the thermostat wiring in parallel from the
thermostat to the terminaJ blocks on each fan control.
for the "G" and '+Y"connections only Interconnect the
winng from the "C" connections at the terminal blocks
on each fan control. Note: The "Y" connection ls not
required if air conditloning is not available.
2. Connect wire from "W" connection at the thermostat to
the "W" connection of the electronic fan control of
furnace #1
3 Connect wire from "R" connection at the thermoslat to
the "R" connection of the electronic fan control of
furnace #1.
4. Connect wire from the "W" connection of the electronic
fan control of furnace #1 to one side el the 24Vac coil of
the isolaUon relay (terminal #3)+ (Wire terminals for
connection to the isolation relay are provided in the kit)
5, Connect wire from the "C" connection of the electronic
fan control of furnace #1 to the other side of the 24Vac
coil of the isolation relay (terminal #1).
6. Connect one wire to each of the normally open
terminals of the isolation relay (terminals #2 and #4)
and connect to the "R" and "W" connections at the
electronic fan control of furnace #2.
7. -*S_t-the heat delay off timings on each control to the
same setting.
8. Set thermostat anticipator setting at 090
9. Recheck wiring connections, splices, and insulation
Re-apply line power to both appliances.
Two Stage Thermostat Operation
Reference Figure 3
1 Interconnect the Ihermostat wiring in parallel from the
thermostat to the terminal blocks on each fan control.
2,
for the "G' and 'Y' connections only. Interconnect [_,e
wir+ng from the C" connections at the terminal blocks
on each fan control. Note. The "'Y" connection _snot
reduired if air conditioning is not availab t=
Connect wire from "WI" of the thermostat to the W'"
connection of the electronic fan control of furnace Pl.
3. Connect wire from "W2" of the thermostat toone side
of the 24Mac coil of the isolation relay (terminal #3).
(VVire terminals for connection to the isolation relay are
provided in the kit)
4. Connect wire from'R" connection at the thermostat to
the "R" connection of the electronic fan control of
furnace #1.
5. Connect wire from the "C" connection of the electronic
fan control of furnace #1 to the other side of the 24Vac
coil of the isolation relay (terminal #1).
6. Connect one wire to each of the normally open
terminals of the isolation relay (terminal #2 and #4) and
connect to the 'R" and "W" connections at the
electronic fan control of furnace #2.
7. Set the heat delay off timings on each control Lothe
same setting.
8. Set thermostat anticipator setting at 0.75 for the tst
stage and 0.15 for the 2rid stage.
9. Recheck wiring connections, splices, and insulation.
Re-apply line power to both appliances.
Twinning+Kit Operation
1. Turn the heat/cool switching at the thermostat to
"OFF", or set so neither a call for heating nor cooling _s
being made.
2. Turn the fan switch to "ON" from "AUTO", or jumper
from '+R"to "G" at "furnace 1". Within several seconds,
the circulation blowers of each furnace will start at the
same speed connected to their respective 'heat =.
speed laps,
3. Turn the fan switch to ='OFF" from "AUTO" or remove
the jumper from "R" to"G". Both circulation blowers will
stop after several seconds.
4. Disconnect one wire from the high limit connection on
"furnace 1". Within several seconds, the circulation
blowers of each furnace will start at the same speed
connecled to their respective "heat" speed taps.
5. Re-connect the wire removed from the high limit
connection on "furnace 1". After the completion of the
heating "blower off" delay, both blowers will stop.
6. Repeat steps (4) and (5) with the limit connection in
"furnace 2" versus :furnace 1". The same operation
should result.
7.
8.
Operate the system through a normal call for heat,
burner on operation, and burner off operation. Each
furnace should fire and cycle both blowers, including
blower on and off delays, as in a normal single system.
Operate the system through a normal call for cooling.
The compressor operation should function normatiy.
with each furnace circulation blower operating at the
speeds connected to their respective "cool" speed
taps after cooling "blower on" delay. When the call for
cooling ends, Ihe circulation blowers will stop upon the
completion of the "cooling off" delay.
Tuesday 29 o£ Sep 1998, Faxination ->5123390477 Page 4 :>£ _
Figure 1 Connection of Twinning Leads and Locating Isolation Relay On Furnace #1 Control Panel
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Transformer
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I_1 II1
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ELECTRONIC
FAN
CONTROL
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Isolation Relay (SPST)
Drill Two 1/8" Dla.
Holes For Mounting
_--Control Panel
(Located In Blower Compartment)
©
Connect twinning leads as shown
Connect Zl to Zl and Z.2to Z2.
o
0
_ Twinning Leads
EIm:trordc Fen
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Electranlc _ _==J
. .. C_ntrt:d
Y_
O O
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