Switch Input; Chilled Water Pump; Chilled Water Proof Of Flow; Condenser Water Pump - Trane CVHE Installation, Operation And Maintenance Manual

Table 20. Unit control panel wiring 120 Vac (continued)
(b) If the Condenser Water Flow Proving Input is a factory-installed ifm efector® flow-sensing device, the secondary (optional) field device for proof of flow
connects from 1X1-6 to 1K27-4 (binary input; normally open, closure with flow). Remove factory jumper when used.
(c) Standard low-voltage circuits (less than 30 Vac) must be separated from 120 Vac or higher wiring.
Water Pump Interlock Circuits
and Flow Switch Input
W W A A R R N N I I N N G G
H H a a z z a a r r d d o o u u s s V V o o l l t t a a g g e e ! !
F F a a i i l l u u r r e e t t o o d d i i s s c c o o n n n n e e c c t t p p o o w w e e r r b b e e f f o o r r e e s s e e r r v v i i c c i i n n g g c c o o u u l l d d
r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y . .
D D i i s s c c o o n n n n e e c c t t a a l l l l e e l l e e c c t t r r i i c c p p o o w w e e r r , , i i n n c c l l u u d d i i n n g g r r e e m m o o t t e e
d d i i s s c c o o n n n n e e c c t t s s b b e e f f o o r r e e s s e e r r v v i i c c i i n n g g . . F F o o l l l l o o w w p p r r o o p p e e r r
l l o o c c k k o o u u t t / / t t a a g g o o u u t t p p r r o o c c e e d d u u r r e e s s t t o o e e n n s s u u r r e e t t h h e e p p o o w w e e r r
c c a a n n n n o o t t b b e e i i n n a a d d v v e e r r t t e e n n t t l l y y e e n n e e r r g g i i z z e e d d . . V V e e r r i i f f y y t t h h a a t t n n o o
p p o o w w e e r r i i s s p p r r e e s s e e n n t t w w i i t t h h a a v v o o l l t t m m e e t t e e r r . .
N N o o t t e e : : The circuits for the chilled water proof of flow
and the condenser water proof of flow do NOT
require external power. Refer to the wiring
diagrams that shipped with the chiller.

Chilled Water Pump

1. Wire the evaporator water pump contactor (5K1) to
a separate 120 volt single-phase power supply with
14 AWG, 600V copper wire.
2. Connect circuit to 1A5-J2-6.
3. Use 1A5-J2-4 120 Vac output to allow the control
panel to control the evaporator water pump, or wire
the 5K1 contactor to operate remotely and
independently of the control panel.

Chilled Water Proof of Flow

When this circuit is installed properly and the
evaporator pump is running and providing the required
minimum flow, this circuit will prove the evaporator
water flow for the chiller controls. Proof of evaporator
water flow is required before the start sequence will be
allowed to proceed and a loss of evaporator water flow
during chiller operation will result in a chiller shut-
down.
Refer to as-built schematics on the inside of the control
panel for field wiring. This is a dry binary input;
normally-open, closure for flow. Apply no external
power.
1. With factory-installed ifm efector® flow-sensing
devices, a field-provided secondary flow-sensing
device is recommended with applications having
38°F (3.3°C) and below leaving evaporator water
temperatures. When a secondary flow-sensing
device is used, remove the factory jumper and
install its contacts between 1X1-5 to 1K26-4; this
places the secondary flow sensing device in series
with the ifm efector® flow-sensing device.
2. For field-provided primary proof of flow devices,
CVHE-SVX02M-EN
S S y y s s t t e e m m C C o o n n t t r r o o l l C C i i r r c c u u i i t t W W i i r r i i n n g g ( ( F F i i e e l l d d W W i i r r i i n n g g ) )
connect the primary proof of flow device between
terminals 1X1-5 to 1A6-J3-2. A secondary field
device is recommended with applications having
38°F (3.3°C) and below leaving evaporator water
temperatures, and must be field-wired in series
with the primary proof of flow device.

Condenser Water Pump

1. Wire the condenser water pump contactor (5K2) to
a separate 120-volt, single-phase power supply with
14 AWG, 600-volt copper wire.
2. Connect circuit to control panel terminals 1A5-J2-3.
3. Use 1A5-J2-1 120 Vac output to allow the control
panel to control the condenser pump.

Condenser Water Proof of Flow

When this circuit is installed properly and the
condenser pump is running and providing the required
minimum condenser water flow, this circuit will prove
the condenser water flow for the chiller controls. Proof
of condenser water flow is also required for the start
sequence will be allowed to proceed and a loss of
condenser water flow during chiller operation will
result in a chiller shut-down.
Refer to as-built schematics on the inside of the control
panel for field wiring. This is a dry binary input;
normally-open, closure for flow. Apply no external
power.
1. With factory-installed ifm efector® flow-sensing
devices, a secondary field-provided flow-sensing
device is optional. When a secondary flow-sensing
device is used, remove the factory jumper, and
install its contacts between 1X1-5 to 1K27-4; this
places the secondary flow sensing device in series
with the ifm efector® flow-sensing device.
2. For field-provided primary proof of flow devices,
connect the primary proof of flow device between
terminals 1X1-6 to 1A6-J2-2. The secondary field
provided flow sensing device is optional; however,
when it is present, it must be field-wired in series
with the primary proof of flow device.

Temperature Sensor Circuits

All temperature sensors are factory installed except the
optional outdoor air temperature sensor. This sensor is
required for the outdoor air temperature type of chilled
water reset. Use the following guidelines to locate and
mount the outdoor air temperature sensor. Mount the
sensor probe where needed; however, mount the
sensor module in the control panel.
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