Control Power Transformer; Thermostat Location; Controls Using 24 Vac - Trane GEHE 072-180 Installation, Operation And Maintenance Manual

Control Power Transformer

The 24 V control power transformers are to be used only
with the accessories called out in this manual. A 50 VA
transformer is externally fused.Transformers rated
greater than 50 VA are equipped with circuit breakers. If a
circuit breaker trips, turn OFF all power to the unit before
attempting to reset it.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury. Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized.
The transformer is located in the control panel.

Thermostat Location

Figure 58. Thermostat/sensor location
NO
YES
NO O
Location of the thermostat or zone sensor is an important
element of effective room control.
Areas where the thermostat or zone sensor should not be
located include:
• Behind doors or corners
• Near hot or cold air ducts
• Near radiant heat (heat emitted from appliances or the
sun)
• Near concealed pipes or chimneys
• On outside walls or other non conditioned surfaces
In air-flows from adjacent zones or other units.

Controls Using 24 VAC

Before installing any wire, refer to the electrical access
locations in the "Unit Dimensions, " p. 13
Ensure that the AC control wiring between the controls
and the unit termination point does not exceed 3 Ohms/
conductor for the length of the run.
WSHP-SVX01Q-EN
Component Failure!
Resistance in excess of 3 Ohms per conductor could
result in component failure due to insufficient AC
voltage supply.
Check all loads and conductors for grounds, shorts, and
mis-wiring. Use copper conductors unless otherwise
specified. Do not run the AC low-voltage wiring in the
same conduit with the high voltage power wiring.
Table 40.
Distance from unit to
Figure 59. Low-voltage connection (GEH/V .5 to 5 ton
Basic Controls Wall Mounted Thermostat
1TB1
1
2
3
4
5
6
7
NO
8
9
10
11
12
13
14
15
16
17
18
1TB1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
(a) Basic controls not available on EXH/V units
Low-voltage connection diagrams for basic and deluxe 24
V control packages mounted on .5-6 ton equipment sizes
are shown in
of this manual.
NOTICE
24V AC conductors
control
000-460 ft
461-732 ft
733-1000 ft
(a)
and EXH/V .5 to 6 ton equipment)
24 VAC
FAN
REVERSING VALVE (COOL)
COMPRESSOR & VAR SPD PUMP SOLENOID
24 VAC GENERAL ALARM OUTPUT
24 VAC COMMON & VAR SPD PUMP SOLENOID
Deluxe Controls with Reheat
24 VAC
FAN
REVERSING VALVE (COOL)
COMPRESSOR
24 VAC COMMON & VAR SPD PUMP SOLENOID
24 VAC COMPRESSOR DISABLE INPUT
24 VAC COMPRESSOR DISABLE INPUT
HUMIDISTAT
VAR SPD PUMP SOLENOID
ALARM CONTACT OUTPUT
ALARM CONTACT OUTPUT
Figure 59, p. 59.
Installation
Recommended wire size
18 gauge
16 gauge
14 gauge
Deluxe Controls Wall Mounted Thermostat
1TB1
1
24 VAC
2
FAN
3
REVERSING VALVE (COOL)
4
COMPRESSOR & VAR SPD PUMP SOLENOID
5
6
24 VAC COMMON & VAR SPD PUMP SOLENOID
7
ELECTRIC HEAT
8
9
24 VAC COMPRESSOR DISABLE INPUT
24 VAC COMPRESSOR DISABLE INPUT
10
11
12
13
14
15
ALARM CONTACT OUTPUT
16
ALARM CONTACT OUTPUT
17
18
59