McQuay LML User Manual

IM 439 / Page 13 of 24
Figure 15. Typical MicroTech unit — dual compressor
LEGEND
Component
Wire Connector
Thermistor
Heater Crankcase Heater
Optional Wiring
V1 & V2 Expansion Valve
R1, R2 & R3 Relay
M2 & M3 Compressor Contactor
T1 & T2 Transformer
RV1 & RV2 Reversing Valve Solenoid
LP1 & LP2 Low pressure Switch
HP1 & HP2 High Pressure Switch
LT1 & LT2 Low Temperature Switch
M1 Fan Starter
TB Terminal Block Connection
>>
>>
>>>>
>>>>
>>
>>
>>
>>
Gnd Lug
L1
PB1
1
123
2
L1
L2
L3
T1
BK
RD
YE
Fan
Mtr.
GR/Y
E
M1
T2
T3
3
7
16
T1
T2
T3
Compr.
Mtr.
1
T1
T2
T3
Compr.
Mtr.
2
8
12
17
9
13
18
12
13
L1
L2
L3
T1
T2
T3
M2
4
M3
4
5
14
6
15
BK
BK/RD 460V
OR 230V
RD 208V
BK 575V
VT 400V
BK
YE
BL
93
V1
WH
WH
CKT1
CKT 2
91
90
Circuit
Breaker
9695
WH
94
V2
45
44
81
60
C
C
BR
84
85
83
82
RV2
80
79
LP2
LT2
3
2
J10J11J4
Auxiliary
Module
MicroTech
Controller
J8
77
78
1234 1234
1
J2 J1
21
46
Disch
Air
Water
Out
44
42
43
Condensate
Lo Temp SRC
Lo Temp SIG
Lo Press SIG
Lo Press SRC
Hi Press SIG
RV Com
RV Out
Comp Com
Comp Out
Fan Com
Fan Out
24VAC
24V Gnd
Discharge Air Com
Remote D1 SRC
Remote D1 SIG
Spare Relay NC
Spare Relay NO
Spare Relay Com
RM Sensor LED
Tenant Override
RM Sensor In
Lon Talk
RM Sensor Com
24VAC Com
Lon Talk
Discharge Air Water
Water Out Com
Water Out In
Aux Module DC Com
Aux Module DC +
Aux Module SEL 2 Aux Module SEL 1
Aux Module CLK
Aux Module RCV
Aux Module XMT
41
40
39
BR
38
37
36
35
RV1
M1
BR
59
C2
4
C
C
HP1
M2
Condensate
Overflow
34
32
76
LP1
LT1
32
34
30
31
33
45
47
53
54
56
55
48
49
50
51
52
123456789101111121314
J4
J1 J2
78910 561
69
E
L
U
P
C
Terminal Board #2
70
71
72
73
12345 6789101112
67
68
66
65
64
63
62
12345678
9
J5 J6
234
234 567
4321 4321
81
BR
M3
HP2
T1 (50VA)
19
20
21
14
15
T1
T2
T3
L1
L2
L3
L2 L3
T1 T2 T3
Heater
(Ext. Rng. Only)
Heater
(Ext. Rng. Only)
Terminal Board #1
(optional)

McQuay LML Specifications

General

Brand	McQuay
Model	LML
Category	Heat Pump
Language	English

Summary

Installation Procedures

General Installation Procedures

General steps for safe and correct unit installation.

Unit Location Requirements

Guidelines for selecting an appropriate location for the unit.

Unit Arrangement and Filter Access

Describes piping, filter access, and service panel clearance.

Vibration Isolation Methods

Recommendations for mounting units on vibration isolators.

Air Balancing and Sheave Adjustment

Procedures for balancing airflow and adjusting motor sheaves.

Ductwork and Ventilation Air

Guidelines for ductwork design and ventilation air integration.

Optional Ductwork Accessories

Optional Duct Collar and Filter Rack

Details on optional duct collars and filter racks.

Piping and System Flushing

Piping Installation Guidelines

Best practices for supply, return, and condensate piping connections.

System Cleaning and Flushing

Steps for cleaning and flushing the water circulating system.

Start-up Procedures

Initial Start-up and Operation Checks

Step-by-step guide for unit start-up and initial operation checks.

Operating Limits and Electrical Data

Operating Environment and Limits

Defines acceptable ambient and water temperature/enthalpy limits.

Electrical Installation and Voltage Limits

Covers power supply, wiring, and voltage tolerance for unit operation.

Typical Wiring Diagrams

Mark IV/AC Single Compressor Wiring

Diagram for single compressor units using Mark IV/AC control.

Mark IV/AC Dual Compressor Wiring

Diagram for dual compressor units using Mark IV/AC control.

MicroTech Single Compressor Wiring

Diagram for single compressor units using MicroTech control.

MicroTech Dual Compressor Wiring

Diagram for dual compressor units using MicroTech control.

Unit Operation and Control

General Unit Operation Overview

Overview of the control system and basic unit operational functions.

Mark IV/AC Control Sequence

Details the sequence of operations for Mark IV/AC control units.

Mark IV/AC Control Features and Faults

Describes fault status, remote reset, and fault retry features.

Thermostat Connection Diagrams

Thermostat Wiring for 070-121 Units

Wiring for 7-day and non-programmable thermostats on specific unit sizes.

Thermostat Wiring for 180-290 Units

Wiring for thermostats on larger unit sizes (180-290).

Optional Remote Sensor Installation

Instructions for installing an optional remote sensor for thermostat integration.

Miscellaneous Options

Pump Restart Relay Kit Installation

Details the pump restart relay kit for loop water control integration.

Motorized Valve and Relay Options

Motorized Valve Installation Guide

Illustrates the typical installation of a motorized valve assembly.

Boilerless System Kit (BSK)

BSK Functionality and Control

Explains BSK features like temperature control and override for duct heaters.

Auxiliary Relay Features

Auxiliary Relay Connection Examples

Illustrates various ways to connect the auxiliary relay for different functions.

Field Installed MicroTech Options

MicroTech Output Signal Configuration

Details options like scheduled outputs, auxiliary heat, and fresh air dampers.

Troubleshooting Guide

Unit Not Running Troubleshooting

Steps for diagnosing when neither fan nor compressor runs.

Compressor Cycling Troubleshooting

Diagnosing issues causing the compressor to cycle rapidly.

Compressor Start Failure Troubleshooting

Steps for when the compressor attempts to start but fails.

Fan Operation, No Compressor Troubleshooting

Diagnosing issues when the fan runs but the compressor does not.

Insufficient Cooling/Heating Troubleshooting

Steps for when the unit provides inadequate cooling or heating.

Maintenance and Warranty

Routine Maintenance Procedures

Outlines filter changes, lubrication, and drain pan checks.

Product Warranty Information

Details terms and conditions of the product warranty.