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Fig. 25 — Thru-the-Base Fitting Assembly (Shown in
Shipping Position)
High Voltage
Conduit
Connector
Auxiliary
Power Supply
(Optional)
Fig. 26 — Thru-Base Connection Fittings
1. Remove the "L" bracket assembly from the unit.
2. Remove connector plate assembly from the "L"
bracket and discard the "L" bracket, but retain the
washer head screws and the gasket (located
between the "L" bracket and the connector plate
assembly).
NOTE: Take care not to damage the gasket, as it is reused
in the following step.
3. Place the gasket over the embossed area in the
basepan, aligning the holes in the gasket to the holes
in the basepan. See Fig. 26.
4. Install the connector plate assembly to the basepan
using 8 of the washer head screws.
NOTE: If electrical connections are not going to occur at this
time, tape or otherwise cover the fittings so that moisture
does not get into the building or conduit in the interim.
Check tightness of connector lock nuts before connecting
electrical conduits.
Field-supplied
and
field-installed
connectors and conduit may be attached to the connectors
on the basepan. Pull correctly rated high voltage and low
voltage through appropriate conduits. Connect the power
RHV-090-120-01SI
Low Voltage
Conduit
Connector
liquid-tight
conduit
Specifications subject to change without notice.
conduit to the internal disconnect (if unit is so equipped) or
to the external disconnect (through unit side panel).
Remove one of the two knockouts located on the bottom left
side of the unit control box. Use this hole for the control
conduit.
UNITS WITHOUT THRU-BASE CONNECTIONS
1. Install power wiring conduit through side panel open-
ings. Install conduit between disconnect and control
box.
2. Install power lines to terminal connections as shown in
Fig 17.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. On 3-
phase units, voltages between phases must be balanced
within 2% and the current within 10%. Use the following
formula to determine the percent of voltage imbalance. Op-
eration on improper line voltage or excessive phase imbal-
ance constitutes abuse and may cause damage to electrical
components.
Such
operation
applicable unit warranty.
Example: Supply voltage is 230-3-60
max voltage deviation from average voltage
% Voltage
= 100 x
Imbalance
Example: Supply voltage is 230-3-60
AB = 224 v
A
B
C
BC = 231 v
AC = 226 v
MOTOR
(224 + 231 + 226)
Average Voltage =
Determine maximum deviation from average voltage.
(AB) 227-224 = 3 v
(BC) 231-227 = 4 v
(AC) 227-226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100x
This amount of phase imbalance is satisfactory as it is below the maxi-
mum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
FIELD CONTROL WIRING
RHV090-120 units requires an external temperature control
device. This device can be a thermostat (field-supplied) or a
thermostat emulation device provided as part of a third-party
Building Management System..
THERMOSTAT
Select a field-installed thermostat. When electric heat is in-
stalled in the RHV unit, the thermostat must be capable of
energizing the G terminal (to energize the Indoor Fan Con-
tactor) whenever there is a space call for heat (energizing
the W1 terminal).
Install the thermostat according to the installation
instructions included with the thermostat.
Locate the thermostat on a solid wall in the conditioned
space to sense average temperature in accordance with the
thermostat installation instructions.
would
invalidate
average voltage
681
=
=
227
3
3
4
= 1.78%
227
any
19
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