Instruction manual

8
Step 8 — Compressor Crankcase Heater
This compressor has an internal crankcase heater. Furnish power
to the unit a minimum of 24 hr before starting the unit for the first
time.
To furnish power to heater only, set thermostat to OFF and close
electrical disconnect to outdoor unit.
Power is not required to the indoor unit or User Interface for proper
operation of heater. Crankcase heater will be intelligently
energized as needed between operations, even when the UI or
thermostat and indoor unit is not installed, as long as there is power
to the outdoor unit.
Airflow Setup for Infinity Touch Control Furnace
or FE Fan Coil (communicating)
This system can only be installed with Infinity-- capable indoor and
Infinity Touch User Interface (UI) SYSTXCCUITN01 or
SYSTXCCUITW01 with version 11 software or newer. When
using an Infinity Touch User Interface, airflow is automatically
selected based on equipment size. The user has the option of
selecting Comfort, Efficiency and Max airflow for Heating and/or
Cooling modes. These should be selected based on balance
between the homeowner ’s comfort and energy consumption
expectations. See User Interface Installation Instructions for
additional available adjustments.
Due to using a communicating control with the fan coil or the
furnace, dip switch adjustments are not necessary. The outdoor
unit configuration and the indoor airflows are determined by
communicating control setup.
Airflow Setup for Non--communicating Fan Coil
The system can be installed with a standard 2--stage heat pump
thermostat and FV4C fan coil without additional accessories.
Select appropriate unit size on fan coil Easy select board.
For replacement applications with older FV4(A,B), FK4 and 40FK
fan coils, the model plug in the outdoor unit must be changed per
Table 2 below.
The model plug adjusts compressor speed to match available low
stage indoor airflow.
Table 2 – Alternate Model Plug
FV4(A,B), FK4, 40FK Fan Coil Models*
(Requires outdoor model plug change)
Unit Size
Factory
Model Plug #
HK70EZ***
Required Accessory
Model Plug #
HK70EZ***
25VNA824
25VNA825
001 016
25VNA836 002 017
25VNA848 003 018
* FK4 and 40FK also require a TXV change. See accessory list for approved TXV.
Airflow Setup for Non--communicating Furnaces
For installations with non--communicating furnaces, set airflows to
350--400 cfm/nominal ton in high stage and 70-- 80 percent of high
stage airflow in low stage.
Step 9 — Install Accessories
No refrigeration circuit accessories are required or are available for
installation within the unit. External to the unit, the same
accessories such as support feet, snow rack, wind baffle etc.,
available on other Carrier units, can also be used on this line of
product. For models utilizing 23 inch x 23 inch base pans, it is
recommended to use 5 support feet in order to fully support unit.
See Fig. 9. Refer to the individual Installation Instructions
packaged with kits or accessories when installing.
A14008
Fig. 9 -- Recommended Support Feet Location
Step 10 — Start--Up
CAUTION
!
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
Observe the following:
1. Do not overcharge system with refrigerant.
2. Do not operate unit in a vacuum or at negative pressure.
3. Do not disable low pressure transducer or high pressure.
4. Dome temperatures may be hot.
CAUTION
!
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Wear safety glasses, protective clothing, and gloves when
handling refrigerant.
CAUTION
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent refrigerant to
the atmosphere. Recover during system repair or final unit
disposal.