INTERFACE BOARD
PARKER
INDOOR THERMOSTAT INTERFACE BOARD
PARKER
INDOOR THERMOSTAT
BUS
VZD/TSR
4a — SINGLE ZONE
4b — MULTI-ZONE
Fig. 4 — Thermostat Connections
20. Strip thermostat wire leads back 1/8-in. and make
connections to blower kit interface board as shown
in Fig. 4a or 4b. Slide noise suppressor down thermo
stat wire and position close to interface board.
21. Route interface cable provided with Model 38EV or
QV outdoor unit to furnace, as described in Model
38EV,QV installation instructions.
22. To permit routing of interface cable into furnace
blower compartment it is necessary to modify furnace
cabinet according to the following procedure,
referring to Fig. 5.
a. Provided with kit are 2 sheet metal covers, screws
and snap bushing. See Fig. 5. Use one cover as a
template. Mark and drill two 1/8-in. diameter
mounting screw holes in either side of furnace
cabinet.
NOTE: Be sure to locate cable entry hole where
cable does not interfere with interior furnace com
ponents. Also, before making hole be sure cable
reaches proper receptacle (PI) on blower acces
sory interface board.
b. Use a chassis punch or similar tool to cut a 1 /2-in.
X 1-5/8 in. rectangular cable entry opening
between the 2 sheet metal cover mounting screw
holes to permit passage of interface cable
connector.
c. Mount the 2 sheet metal covers loosely to cabinet
with one screw. See Fig. 5.
d. Route interface cable through cable entry hole
into furnace blower compartment to receptacle PI
of blower accessory interface board. Connector is
polarized so it cannot be mounted in wrong direc
tion. Be sure spring clips on connector lock in
place to secure connector. Secure cable ground
wire to convenient interface board mounting
screw.
e. Mount indoor coil solenoid expansion valve
(SEV) as described in Model 38EV,QV outdoor
section installation instructions. Route 4-lead
wire harness from SEV through interface cable
entry hole to interface board polarized recep
tacle P2.
f. Open snap bushing provided and install busliing
around interface cable and 4 SEV leads at cable
entry hole with large rim of bushing facing out
ward from cabinet.
g. Slide 2 sheet metal covers together around bush
ing and secure covers loosely with remaining
mounting screw. Adjust cable and leads to allow
slack inside cabinet for strain relief.
h. Tighten both sheet metal cover mounting screws
with bushing positioned to protect cable and
leads from metal edges of cable entry hole.
COVER DISASSEMBLED WITH
SNAP BUSHING ATTACHED TO LEADS
23.
24.
25.
26.
COVER FULLY ASSEMBLED
Fig. 5 — Cable Entry Hole and Cover
Peel off backing from wiring diagram and stick on
top of previous furnace wiring diagram located on
inside of blower access panel.
Reinstall control and blower access panels. See Fig. 3
for a wiring diagram showing proper field high- and
low-voltage wiring. Make all electrical connections
in accordance with National Electrical Code and any
local codes or ordinances that might apply.
Clean 2-in. x 3-in. area next to unit rating plate.
Peel backing from auxiliary rating plate and stick to
clean area next to unit rating plate.
NOTE: DO NOT apply auxiliary rating plate on top
of the unit rating plate. Make sure both rating plates
are legible after installation.
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