6
McQuay IM 660-3
Commissioning
The following commissioning procedures pertain to water
source heat pumps equipped with the MicroTech Water Source
Heat Pump Controller. These procedures must be performed in
addition to the mechanical and electrical system
commissioning procedures outlined in the model-specific
installation literature (listing provided in Table 1 on page 1).
Pre-Start
Required tools and literature
The following tools and additional literature may be required
to properly commission a MicroTech 2000 Water Source Heat
Pump Controller.
Tools:
•
Digital voltmeter
•
Digital ohmmeter
•
Digital thermometer
•
General technician’s tools
•
PC equipped with Monitor™ software (Network Water
Source Heat Pumps only)
Literature:
•
Model-specific water source heat pump installation bulletin
(See Table 1 on page 1.)
•
Program-specific sequence of operation bulletin
•
MicroTech Monitor Program User’s Manual (if PC is used)
Water Source Heat Pump Identification
Although the water source heat pumps look similar, there are
significant internal differences that are defined by the model
number code string. In addition to the basic heating and
cooling equipment, the model number code string specifies
which factory-configured options are provided. These options
determine the internal wiring configuration and the field
wiring requirements.
It is extremely important to correctly locate each water source
heat pump according to job requirements. The proper location
should have been determined during the installation process.
Nevertheless, verify proper location during the commissioning
process.
Field Wiring Check
A unit wiring diagram is provided with each unit, along with a
model-specific Installation and Maintenance Guide. Before the
commissioning process begins, refer to this literature and,
using the following check lists, thoroughly check the electrical
installation.
Wall Sensor Packages
1
Check that the cable is twisted and shielded with drain wire
(Belden 8729 or equivalent).
2
Check that four conductors are available.
3
Check that the conductors are terminated at the unit and at
the wall sensor package to screw terminal board #1 in
accordance with the field wiring diagram, on which
terminals are clearly labeled. Terminal 4 is used for both
the room sensor common and the shield wire.
4
Check the cable length between the wall sensor package
and its water source heat pump controller. (See Table 4 on
page 5.)
Network Communication Units
1
Check that the cable is a twisted, unshielded pair of copper
strand conductors.
2
Check that the conductors are terminated properly.
3
Check that the conductors are terminated at the MicroTech
gateway panel according to the field wiring diagram
supplied with the panel.
Set Points
The Water Source Heat Pump set point values are held in
memory and can be modified only over the MicroTech
network. Initially, before any changes are made over the
network, the WSHP uses the default factory set points shown
in Table 5.
Start-up
Following are WSHP start-up procedures for each
communication type. The start-up procedure must be
performed by a qualified technician for every WSHP on a job.
Connections for network wiring are made at terminals 5 and 6
of Terminal Board #1. The FTT-10 (free topology transceiver)
on the MicroTech WSHP 2000 Controller is polarity
insensitive; thus polarity issues need not be addressed.
WARNING
Electrical Shock Hazard. Can cause severe injury or death.
Failure to bond the frame of this equipment to the building
electrical ground with the grounding terminal provided or other
acceptable means can result in electrical shock. Service must
be performed only by qualified personnel.
CAUTION
Before applying power to any unit, closely follow the pre-start
procedures in the model-specific installation literature. See
Table 1 on page 1
.
