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INSTALLATION INSTRUCTIONS FOR THE TRAINED SERVICE TECHNICIAN
APPLICATION
Thesethermostats
and subbases provide 24 to 30 Vat control for two-stage
heating and one-stage cooling heat pump
systems as follows:
MODEL
I
CHANGEOVER
1
SYSTEM SWITCHING
1
FAN SWITCHING
Y594G (T874GIQ674F)
Automatic (Heat or Cool)
OFF-EM.HT.-HEAT-
AUTO-ON
AUTO-COOL
T874RlQ674L
Manual
1
EM.HT.-HEAT-OFF-COOL
1
AUTO-ON
OPERATION
On a two-heat
thermostat,
the two stages of heat
"make" sequentially
as the temperature
drops. "Make"
refers to the mercury switch initiating a call for heat or
COOL
There is about 2 F [1 .I C] between stages so that the
second stage (auxiliary heat) makes only when the first
stage can't
handle
the load. This is the interstage
differential.
Three LEDs (light-emitting
diodes) are included on the
subbase. The red CHECK LED lights when something
needs to be checked
or done to maintain
efficient
operation
of the system.
See your
heating
system
instructions
to find out specifically what the CHECK LED
signifies. The green LED lights when the AUX. HT. stage
(second stage) heat is operating. The red EM.HT. LED
lights when the EM.HT. relay is energized,
usually
operating electric strip heaters.
INSTALLATION
WHEN INSTALLING THIS PRODUCT.
. .
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 the product is suitable for your
application.
3. Installer must be a trained, experienced
service
technician.
4. After installation
is complete,
check out product
operation as provided in these instructions.
1. Disconnect
power supply to prevent electrical
shock or equipment damage.
2. Run wires as close to the subbase as possible.
To prevent
interference
with the thermostat
linkage, keep wire length to a minimum. Push
excess wire back into the hole, and plug hole to
prevent
drafts
from
affecting
thermostat
operation.
3. Do not overtighten thermostat captive mounting
screws
as damage to subbase threads
may
result.
4. Do not short across coil terminals on relay. This
may burn out the heat anticipator.
LOCATION
Install thethermostatabout5ft]l.5
m]abovethefloor
in
an area with good circulation at average temperature.
Do not install
the thermostat
where
it may be
affected by-
-drafts,
or dead
spots
behind
doors
and in
corners.
-hot
or cold air from ducts.
-radiant
heat from sun or appliances.
-concealed
pipes and chimneys.
-unheated
(uncooled)
areas behind
the ther-
mostat, such as an outside wall.
MOUNTING
THE SUBBASE
The thermostat subbase can be mounted on a vertical
outlet box, horizontal outlet box, or directly on the wall.
1. If you must mount the subbase on a vertical outlet
,
box, order
19312lA
Adapter
Assembly
(Fig. 1). The
assembly includes an adapter ring, two screws, and a
cover plate to cover marks on the wall. Install the ring and
cover plate on the vertical outlet box
Fig. l-Installation
of subbase
on outlet box.
SM.
Rev. 5-86.
Form Number
69-0272-1
@Ho"eyweli Inc. 1986
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Summary of Contents for Honeywell Super Tradeline Y594G
- Page 1 MODEL CHANGEOVER SYSTEM SWITCHING FAN SWITCHING OFF-EM.HT.-HEAT- Automatic (Heat or Cool) AUTO-ON Y594G (T874GIQ674F) AUTO-COOL Manual EM.HT.-HEAT-OFF-COOL AUTO-ON T874RlQ674L OPERATION subbase. The red CHECK LED lights when something On a two-heat...
- Page 2 For a wall installation, hold subbase in position and 2. Pull wires through the cover plate (if used) and mark holes for anchors (Fig. 2). Wall anchors must be subbase cable opening (Fig. 3). obtained from local hardware store. Take care that the 3.
- Page 3 Fig. 5-Internal schematic and typical hookup of T8?4R and Q674L in heat pump system. WIRING THE SUBBASE 4. Level the subbase using a spirit level, as shown in Fig. 3, and firmly tighten subbase mounting screws. The All wiring must comply with local electrical codes and subbase mounting holes provide for minor out-of-lever ordinances.
- Page 4 2. Firmly tighten each terminal screw. 4. Note the tabs along the top inside edge of the 3. Fit wires as close to the subbase as possible. Push thermostat base. The tabs fit into corresponding slots on excess wire back into hole. top of the subbase.
- Page 5 THERMOSTAT These thermostats are accurately calibrated at the factory. THEY DO NOT HAVE PROVISION FOR FIELD CALIBRATION. THERMOMETER The thermometer in your thermostat has been ac- curately calibrated at the factory. The thermometer should only need adjustment if it has been dropped or shifted due to mishandling.