HMI HOYME TMADP-0240-3WS User manual

3-Way Switch + 24 Hour Timer–Damper Control
Easy to Follow Installation Instructions for the
HMI HOYME Adaptor TMAD -0240-3WS
A Forced Air Heating System having a Fresh Air Intake Duct leading into the return lenum
is often equi ed with a ower Oen Dam er. Usually the thermostat causes the dam er
to o en for fresh air during furnace firing and allows the Dam er to close when the fire
sto s. To o en the Fresh Air Dam er at times when the furnace is not firing requires the
use of a 3-way switch (SPDT). This Timer/Adaptor, however, has been designed to
override the normal operation of a fresh air damper to remain closed at certain
intervals of the day due to the reoccurrence of foul outside air.
Purchasing a 3-way switch and the necessary extras can be time consuming. By
urchasing this Ready Mounted 3-way switch with an interval timer, TMAD -0240-3WS,
you have eliminated the trouble of buying a 3-way switch, an interval timer, an
electrical enclosure, all separately plus making the necessary connections and the
problems of assembly. This ada tor comes com letely assembled with sim le, easy-to-
follow installation instructions which follow:
1. Mount the Ada tor TMAD -0240-3WS in a convenient lace to
o erate the timer on or around the furnace area with two screws
su lied.
2. Inside the ada tor are terminals “W”, “C” and “R” which are to
be connected to corres onding terminals inside your furnace. Use
3-C 18Ga. thermostat wire.
3. Connect ada tor terminals “#2” and #4 to the two wires on the
motor of the Hoyme Damper ( ower Open Only).
*Automatic Setting: When the Adaptor switch is in the “Automatic”
osition, the thermostat will o erate normally which will cause the
dam er to open during the heating cycle and will allow the dam er to
close when the fire sto s.
*Manual Setting: In the “Manual” osition, the switch will override the
thermostat and will ower the dam er to remain in the open osition.
*NOTE: Engaging the Timer by ositioning the white ins outward overrides both the
“Automatic/Manual” settings of the 3-way switch and the thermostat to keep the fresh air
damper closed during times of foul outside air. See “Interval Timer” age 2.
This Schematic Wiring Diagram in also on the Inside Cover of the Ada tor
1015-ld Printed in Canada

HMI HOYME Adaptor TMAD -0240-3WS Installation Instructions - Page 2
Interval Timer
In addition to the white pins which may be pulled outwards to override both the 3-
way switch and thermostat, there is another pin (switch) located in the centre of the
timer face as shown by the Red Arrow.
There are three positions for
the centre pin. The normal
position is in the ‘middle’. In
this position the timer will
operate as it should. Each
white pin extended outwards
on the periphery will keep the
damper closed 15 minutes.
The centre pin placed in the up
‘ I ’ position will cause the
timer to act as if all the white
pins were extended. This will
override both the 3-way switch
and the thermostat. The
damper will remain continually
closed.
The centre pin in the down ‘ 0 ’
position will override the white
pins causing the timer to have
no effect on the circuit.
Therefore both the 3-way
switch and the thermostat will
have full control of the damper
to open and to close.
(For Adaptor applications, see Color Wire Diagrams #3A3; #4A3 & #8C4.)
1015-ld Printed in Canada