Ingersoll-Rand Voyager TZ 150F Series Service manual

SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-
conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment
by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and
on the tags, stickers, and labels that are attached to the equipment.
Packaged Rooftop Air Conditioners
Voyager™ – Cooling, Gas/Electric
12.5 Tons Ultra High Efficiency
Service Facts
Model Numbers: TZ*150F(3, 4)
YZ*150F(3, 4)
RT-SVF69C-EN
March 2017

© 2017 Ingersoll Rand RT-SVF69C-EN
Introduction
Read this manual thoroughly before operating or servicing
this unit.
Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as
required. Your personal safety and the proper operation of
this machine depend upon the strict observance of these
precautions.
Important Environmental Concerns
Scientific research has shown that certain man-made
chemicals can affect the earth’s naturally occurring
stratospheric ozone layer when released to the
atmosphere. In particular, several of the identified
chemicals that may affect the ozone layer are refrigerants
that contain Chlorine, Fluorine and Carbon (CFCs) and
those containing Hydrogen, Chlorine, Fluorine and
Carbon (HCFCs). Not all refrigerants containing these
compounds have the same potential impact to the
environment. Trane advocates the responsible handling of
all refrigerants-including industry replacements for CFCs
and HCFCs such as saturated or unsaturated HFCs and
HCFCs.
Important Responsible Refrigerant
Practices
Trane believes that responsible refrigerant practices are
important to the environment, our customers, and the air
conditioning industry. All technicians who handle
refrigerants must be certified according to local rules. For
the USA, the Federal Clean Air Act (Section 608) sets forth
the requirements for handling, reclaiming, recovering and
recycling of certain refrigerants and the equipment that is
used in these service procedures. In addition, some states
or municipalities may have additional requirements that
must also be adhered to for responsible management of
refrigerants. Know the applicable laws and follow them.
The three types of advisories are defined as follows:
WARNING Indicates a potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
CAUTIONsIndicates a potentially hazardous
situation which, if not avoided, could
result in minor or moderate injury. It
could also be used to alert against
unsafe practices.
NOTICE Indicates a situation that could result in
equipment or property-damage only
accidents.
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes.
WARNING
Personal Protective Equipment (PPE)
Required!
Failure to wear proper PPE for the job being undertaken
could result in death or serious injury. Technicians, in
order to protect themselves from potential electrical,
mechanical, and chemical hazards, MUST follow
precautions in this manual and on the tags, stickers,
and labels, as well as the instructions below:
• Before installing/servicing this unit, technicians
MUST put on all PPE required for the work being
undertaken (Examples; cut resistant gloves/sleeves,
butyl gloves, safety glasses, hard hat/bump cap, fall
protection, electrical PPE and arc flash clothing).
ALWAYS refer to appropriate Material Safety Data
Sheets (MSDS)/Safety Data Sheets (SDS) and OSHA
guidelines for proper PPE.
• When working with or around hazardous chemicals,
ALWAYS refer to the appropriate MSDS/SDS and
OSHA/GHS (Global Harmonized System of
Classification and Labelling of Chemicals) guidelines
for information on allowable personal exposure
levels, proper respiratory protection and handling
instructions.
• If there is a risk of energized electrical contact, arc, or
flash, technicians MUST put on all PPE in accordance
with OSHA, NFPA 70E, or other country-specific
requirements for arc flash protection, PRIOR to
servicing the unit. NEVER PERFORM ANY
SWITCHING, DISCONNECTING, OR VOLTAGE
TESTING WITHOUT PROPER ELECTRICAL PPE AND
ARC FLASH CLOTHING. ENSURE ELECTRICAL
METERS AND EQUIPMENT ARE PROPERLY RATED
FOR INTENDED VOLTAGE.

Introduction
RT-SVF69C-EN 3
Copyright
This document and the information in it are the property of
Trane, and may not be used or reproduced in whole or in
part without written permission. Trane reserves the right
to revise this publication at any time, and to make changes
to its content without obligation to notify any person of
such revision or change.
Trademarks
All trademarks referenced in this document are the
trademarks of their respective owners.
Revision History
Updated Performance Data section.
WARNING
Follow EHS Policies!
Failure to follow instructions below could result in
death or serious injury.
• All Ingersoll Rand personnel must follow Ingersoll
Rand Environmental, Health and Safety (EHS)
policies when performing work such as hot work,
electrical, fall protection, lockout/tagout, refrigerant
handling, etc. All policies can be found on the BOS
site. Where local regulations are more stringent than
these policies, those regulations supersede these
policies.
• Non-Ingersoll Rand personnel should always follow
local regulations.

4RT-SVF69C-EN
Table of Contents
General Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Performance Data . . . . . . . . . . . . . . . . . . . . . . . 8
Sequence of Operation . . . . . . . . . . . . . . . . . . 11
ReliaTel Controls . . . . . . . . . . . . . . . . . . . . . 11
ReliaTel Control Cooling without
an Economizer . . . . . . . . . . . . . . . . . . . . . 11
ReliaTel Control Evaporator Fan
Operation . . . . . . . . . . . . . . . . . . . . . . . . . 11
Drain Pan Condensate Overflow Switch (Op-
tional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Low Ambient Operation . . . . . . . . . . . . . 12
ReliaTel Control Cooling with
an Economizer . . . . . . . . . . . . . . . . . . . . . 12
Economizer Set-Up . . . . . . . . . . . . . . . . . 12
ReliaTel Control Heating Operation for Cool-
ing Only Units . . . . . . . . . . . . . . . . . . . . . . 13
ReliaTel Control Heating Operation for Gas
Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Enhanced Dehumidification . . . . . . . . . . 13
Single Zone Variable Air Volume (Single Zone
VAV) Control . . . . . . . . . . . . . . . . . . . . . . . . . 14
Cooling Operation . . . . . . . . . . . . . . . . . . 14
Economizer Cooling . . . . . . . . . . . . . . . . . 14
Demand Controlled Ventilation . . . . . . . . 14
Economizer Damper Position Set-Up with
DCV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Economizer Damper Position Set-Up without
DCV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Heating Operation . . . . . . . . . . . . . . . . . . 15
Staged Heating Operation . . . . . . . . . . . . 15
Modulating Heat Operation with SZVAV
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Low Ambient Operation . . . . . . . . . . . . . 15
Clogged Filter Option . . . . . . . . . . . . . . . . 15
Ventilation Override . . . . . . . . . . . . . . . . . 16
Emergency Stop . . . . . . . . . . . . . . . . . . . . 16
Phase Monitor . . . . . . . . . . . . . . . . . . . . . 16
Low Pressure Control . . . . . . . . . . . . . . . . 16
High Pressure Cutout and Temperature Dis-
charge Limit . . . . . . . . . . . . . . . . . . . . . . . 16
Coil Frost Protection . . . . . . . . . . . . . . . . . 16
Failure and Override Modes . . . . . . . . . . 17
Variable Air Volume Applications (Traditional
VAV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Supply Air Temperature Control - Occupied
Cooling and Heating . . . . . . . . . . . . . . . . .17
Supply Air Temperature Control with an
Economizer . . . . . . . . . . . . . . . . . . . . . . . . .17
VHR Relay Output . . . . . . . . . . . . . . . . . . .17
Zone Temperature Control without
a Night Setback Panel or ICS - Unoccupied
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Zone Temperature Control without
a Night Setback Panel or ICS - Unoccupied
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Morning Warm-up (MWU) Control . . . . . .18
Daytime Warm-up (DWU) Control . . . . . .18
Supply Duct Static Pressure Control . . . .18
Mechanical Cooling with an Economizer .18
Off Mode . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Heating Operation . . . . . . . . . . . . . . . . . . .19
Zone Temperature - Unoccupied Heating 19
Gas Heat Control . . . . . . . . . . . . . . . . . . . .19
Electric Heat Control . . . . . . . . . . . . . . . . .19
Pressure Curves . . . . . . . . . . . . . . . . . . . . . . . . .20
Refrigerant Charging Procedure . . . . . . . .20
To Check Operating Pressures . . . . . . . . .20
Subcooling Charging Curves . . . . . . . . . . . . .22
Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . .23

RT-SVF69C-EN 5
General Data
Table 1. General data — 12½ — 230V — with eFlex™
technology
12.5 Tons Downflow &
Horizontal Units
T/YZ*150F3
Cooling Performance(a)
Gross Cooling Capacity 154,000
EER(b) 12.5
Nominal CFM / ARI Rated CFM 5,000/4,375
ARI Net Cooling Capacity 148,000
Integrated Energy Efficiency Ratio
(IEER)(c) 20.0
Percent Capacity @ part load
(Turndown Ratio) 4% - 100%
System Power (kW) 11.94
Compressor
Number/Type 3 / Scrolls
Sound 9.2
Outdoor Sound Rating (BELS)(d)
Outdoor Coil
Type Microchannel
Coil Width(in.) 1.0
Face Area (sq. ft.) 42.6
Rows/FPI 1 / 20
Indoor Coil
Type Hi-Performance
Tube Size (in.) ID 0.3125
Face Area (sq. ft.) 31.4
Rows/FPI 4 / 15
Refrigerant Control TXV
Drain Connection Number/Size (in.) 1/1.00 NPT
Outdoor Fan
Type Propeller
Number Used/Diameter (in.) 2 / 26
Drive Type/No. Speeds Direct / Multiple
CFM 11,400
Number Motors/HP 2 / 0.5
Motor RPM 1140
Indoor Fan
Type FC Centrifugal
Number Used/Diameter (in.) 1 / 18x18
Drive Type/No. Speeds Belt / Variable
Number Motors 1
Motor HP (Standard/Oversized) 3.0 / 5.0
Motor RPM (Standard/Oversized) 1,740 / 3,450
Motor Frame Size (Standard/
Oversized) 145T / 145T
12.5 Tons Downflow &
Horizontal Units
T/YZ*150F3
Filters
Type Furnished(e) Throwaway
Number Size Recommended
Downflow (8) 20x20x2
(4) 20x16x2
Horizontal (12) 20x20x2
Refrigerant Charge (Pounds of
R-410a)(f)
sys1/sys2 14/9
(a)Cooling Performance is rated at 95°F ambient, 80°F entering dry bulb,
67°F entering wet bulb. Gross capacity does not include the effect of fan
motor heat. ARI capacity is net and includes the effect of fan motor heat.
Units are suitable for operation to ±20% of nominal cfm. Certified in ac-
cordance with the Unitary Large Equipment Certification Program, which
is based on ARI Standard 340/360-93.
(b)EER is rated at ARI conditions and in accordance with ARI Standard 210/
240 or 360.
(c)Integrated Energy Efficiency Ratio (IEER) is rated in accordance with
AHRI standard 210/240 or 360.
(d)Outdoor Sound Rating shown is tested in accordance with ARI Standard
270 or 370.
(e)An optional 2 inch pleated filter is also available.
(f) Refrigerant charge is an approximate value. For a more precise value,
see unit nameplate and service instructions.
*Indicates both downflow and horizontal units.
Table 1. General data — 12½ — 230V — with eFlex™
technology

6RT-SVF69C-EN
General Data
Table 2. General data — 12½ tons — 460V — with
eFlex™ technology
12.5 Tons Downflow &
Horizontal Units
T/YZ*150F4
Cooling Performance(a)
Gross Cooling Capacity 154,000
EER(b) 12.5
Nominal CFM / ARI Rated CFM 5,000/4,375
ARI Net Cooling Capacity 148,000
Integrated Energy Efficiency Ratio
(IEER)(c) 20.0
Percent Capacity @ part load
(Turndown Ratio) 4%-100%
System Power (kW) 11.84
Compressor
Number/Type 3 / Scrolls
Sound 9.2
Outdoor Sound Rating (BELS)(d)
Outdoor Coil
Type Microchannel
Coil Width(in.) 1.0
Face Area (sq. ft.) 42.6
Rows/FPI 1 / 20
Indoor Coil
Type Hi-Performance
Tube Size (in.) ID 0.3125
Face Area (sq. ft.) 31.4
Rows/FPI 4 / 15
Refrigerant Control TXV
Drain Connection Number/Size (in.) 1/1.00 NPT
Outdoor Fan
Type Propeller
Number Used/Diameter (in.) 2 / 26
Drive Type/No. Speeds Direct / Multiple
CFM 11,400
Number Motors/HP 2 / 0.5
Motor RPM 1100
Indoor Fan
Type FC Centrifugal
Number Used/Diameter (in.) 1 / 18x18
Drive Type/No. Speeds Belt / Variable
Number Motors 1
Motor HP (Standard/Oversized) 3.0 / 5.0
Motor RPM (Standard/Oversized) 1,740 / 3,450
Motor Frame Size (Standard/
Oversized) 145T / 145T
12.5 Tons Downflow &
Horizontal Units
T/YZ*150F4
Filters
Type Furnished(e) Throwaway
Number Size Recommended
Downflow (8) 20x20x2
(4) 20x16x2
Horizontal (12) 20x20x2
Refrigerant Charge (Pounds of
R-410a)(f)
sys1/sys2 14/9
(a)Cooling Performance is rated at 95°F ambient, 80°F entering dry bulb,
67°F entering wet bulb. Gross capacity does not include the effect of fan
motor heat. ARI capacity is net and includes the effect of fan motor heat.
Units are suitable for operation to ±20% of nominal cfm. Certified in ac-
cordance with the Unitary Large Equipment Certification Program, which
is based on ARI Standard 340/360-93.
(b)EER is rated at ARI conditions and in accordance with ARI Standard 210/
240 or 360.
(c)Integrated Energy Efficiency Ratio (IEER) is rated in accordance with
AHRI standard 210/240 or 360.
(d)Outdoor Sound Rating shown is tested in accordance with ARI Standard
270 or 370.
(e)An optional 2 inch pleated filter is also available.
(f) Refrigerant charge is an approximate value. For a more precise value,
see unit nameplate and service instructions.
*Indicates both downflow and horizontal units.
Table 2. General data — 12½ tons — 460V — with
eFlex™ technology

RT-SVF69C-EN 7
General Data
Table 3. General data — heating — 12½ tons with eFlex™ technology
12.5 Tons Downflow & Horizontal Units
Heating Performance (Gas/Electric Only)(a)
Heating Models Low High Modulating Turn Down = 2.5:1
Heating Input (Btu/h) 150,000 250,000 350,000
1st Stage (Btu/h) 100,000 175,000 140,000
Heating Output (Btu/h) 122,000 203,000 283,500
1st Stage (Btu/h) 81,000 142,000 113,400
AFUE% (DF/HZ)(b)
Downflow/Horizontal 81.0 / 81.0 80.7 / 79.9 80.1 / 79.1
Steady State Efficiency % 81 81 81
No. Burners 111
No. Stages 22N/A
Gas Supply Line Pressure
(in. wc) 2.5 / 14.0 2.5 / 14.0 2.5 / 14.0
Natural Only
Natural or LP (minimum/
maximum)
Gas Connection Pipe Size
(in.) 1/2 1/2 3/4
(a)Heating Performance limit settings and rating data were established and approved under laboratory test conditions using American
National Standards Institute standards. Ratings shown are for elevations up to 2000 feet. For elevations above 2000 feet, ratings
should be reduced at the rate of 4% for each 1000 feet above sea level.
(b)AFUE is rated in accordance with DOE test procedures.

8RT-SVF69C-EN
Performance Data
Table 4. Evaporator fan performance—12½ tons with eFlex™ Technology — TZ*150F
External Static Pressure (Inches of Water)
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00
cfm rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp
3-hp Standard Motor & Low Static Drive Accessory 3-hp Standard Motor & Drive
2500(a) ----3540.293970.384340.474680.564990.655270.755530.855770.96
3000(a) ----3690.384110.474480.574830.685140.785430.895701.005961.11
3500(a) ----3870.484260.584620.704960.815280.935571.055851.176111.30
4000 - - 368 0.50 407 0.60 444 0.72 478 0.84 510 0.96 541 1.09 570 1.23 598 1.36 624 1.50
4500 353 0.53 393 0.64 429 0.76 463 0.88 496 1.01 526 1.14 556 1.28 584 1.42 611 1.57 637 1.72
5000 382 0.69 418 0.81 452 0.94 484 1.07 515 1.21 544 1.35 572 1.49 599 1.65 625 1.80 650 1.96
5500 411 0.88 445 1.01 477 1.16 507 1.30 536 1.44 564 1.59 591 1.75 616 1.90 641 2.07 666 2.23
6000 440 1.11 472 1.25 502 1.40 531 1.56 558 1.72 584 1.87 610 2.03 635 2.20 659 2.37 682 2.54
3-hp Standard Motor & High Static Drive Accessory(b)
Continued
External Static Pressure (Inches of Water)
1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00
cfm rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp
3-hp
Standard
Motor &
Drive
3-hp Standard Motor & High Static Drive Accessory(b) 3-hp Standard Motor & High Static Drive Accessory(c)
2500(a) 600 1.07 621 1.18 642 1.29 662 1.41 682 1.53 700 1.65 719 1.78 736 1.91 754 2.04 770 2.17
3000(a) 620 1.23 643 1.35 664 1.47 684 1.59 703 1.72 722 1.86 740 1.99 757 2.13 775 2.27 791 2.41
3500(a) 635 1.42 659 1.55 681 1.68 702 1.81 723 1.95 743 2.08 762 2.22 779 2.37 796 2.52 813 2.67
4000 649 1.64 673 1.78 696 1.92 717 2.06 738 2.21 758 2.36 778 2.51 796 2.66 815 2.81 832 2.96
4500 662 1.87 686 2.02 709 2.18 731 2.33 752 2.49 772 2.65 792 2.81 811 2.98 830 3.14 848 3.30
5000 675 2.13 698 2.29 721 2.46 743 2.63 765 2.80 786 2.97 806 3.14 825 3.32 844 3.49 862 3.67
5500 689 2.41 712 2.58 734 2.76 756 2.94 777 3.13 798 3.31 818 3.50 837 3.68 856 3.87 875 4.06
6000 705 2.73 727 2.91 749 3.10 770 3.29 790 3.48 810 3.68 830 3.88 850 4.08 869 4.28 887 4.48
5-hp Oversized Motor & Drive
Notes:
1. For Standard Evaporator Fan Speed (rpm), reference Table 7, p. 10.
2. For High Evaporator Fan Speed (rpm), reference Table 8, p. 10.
3. For Oversized Evaporator Fan Speed (rpm), reference Table 9, p. 10.
4. Fan motor heat (MBh) = 3.15 x Fan bhp.
5. Data includes pressure drop due to standard filters and wet coils. No accessories or options are included in pressure drop data.
6. For all non-standard sheave combinations, please refer to accessory installer’s guides ACC-SVN34*-EN and ACC-SVN72*-EN.
7. Factory supplied motors, in commercial equipment, are definite purpose motors, specifically designed and tested to operate reliably and continuously
at all cataloged conditions. Using the full horsepower range of our fan motors as shown in our tabular data will not result in nuisance tripping or
premature motor failure. Our product’s warranty will not be affected.
(a)Unit applications below 320 cfm/ton are only applicable to TZD models without electric heat and YZD models with modulating gas heat. See below for
restrictions.
- Electric heaters restricted on applications below 320 cfm/ton.
- Single zone VAV applications are capable of running below 320 cfm/ton during low speed airflow operation, but "full" airflow must be set to 320 cfm/
ton or higher.
(b)Fan Sheave BK110X1 3/16 and 1VP50X7/8 Required.
(c)Fan Sheave BK110X1 3/16 and 1VP56X7/8 Required.

RT-SVF69C-EN 9
Performance Data
Table 5. Evaporator fan performance—12½ tons with eFlex™ Technology — YZ*150F
External Static Pressure (Inches of Water)
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00
cfm rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp
3-hp Standard Motor & Low Static Drive Accessory 3-hp Standard Motor & Drive
2500(a) ----3590.304010.394380.484720.575020.665300.765560.865800.97
3000(a) ----3760.394170.494540.594880.695190.805470.915741.026001.13
3500(a) - - 354 0.40 396 0.50 434 0.61 469 0.72 503 0.84 534 0.95 563 1.07 590 1.20 616 1.32
4000 - - 379 0.53 418 0.64 453 0.75 487 0.87 519 1.00 549 1.13 578 1.26 605 1.40 631 1.54
4500 368 0.56 406 0.68 441 0.80 475 0.92 507 1.05 537 1.19 566 1.33 593 1.47 620 1.62 646 1.77
5000 398 0.74 434 0.87 466 1.00 498 1.13 528 1.27 557 1.41 584 1.56 611 1.71 636 1.87 661 2.03
5500 429 0.95 462 1.08 493 1.23 522 1.38 551 1.52 578 1.67 604 1.83 630 1.99 654 2.15 678 2.32
6000 460 1.19 491 1.34 520 1.50 548 1.66 574 1.81 601 1.97 626 2.14 650 2.30 673 2.48 696 2.66
3-hp Standard Motor & High Static Drive Accessory(b)
Continued
External Static Pressure (Inches of Water)
1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00
cfm rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp
3-hp
Standard
Motor &
Drive
3-hp Standard Motor & High Static Drive Accessory(b) 3-hp Standard Motor & High Static Drive Accessory(c)
2500(a) 602 1.08 624 1.19 644 1.30 664 1.42 684 1.54 702 1.67 721 1.79 738 1.92 755 2.05 772 2.18
3000(a) 624 1.25 646 1.36 667 1.49 687 1.62 706 1.74 725 1.88 743 2.01 760 2.15 777 2.29 794 2.43
3500(a) 640 1.45 663 1.58 685 1.71 707 1.84 727 1.98 747 2.11 766 2.25 783 2.40 800 2.55 816 2.70
4000 656 1.68 679 1.82 702 1.96 723 2.10 744 2.25 764 2.40 783 2.55 802 2.70 820 2.85 837 3.01
4500 670 1.92 694 2.08 717 2.23 738 2.39 759 2.55 780 2.71 799 2.87 818 3.03 836 3.20 854 3.36
5000 685 2.20 709 2.36 731 2.53 753 2.70 774 2.87 794 3.04 814 3.22 833 3.40 852 3.57 870 3.75
5500 701 2.50 724 2.68 746 2.86 767 3.04 788 3.22 808 3.41 828 3.59 847 3.78 866 3.97 884 4.16
6000 719 2.84 741 3.03 762 3.22 783 3.41 803 3.61 823 3.80 842 4.00 862 4.20 880 4.40 898 4.61
5-hp Oversized Motor & Drive
Notes:
1. For Standard Evaporator Fan Speed (rpm), reference Table 7, p. 10.
2. For High Evaporator Fan Speed (rpm), reference Table 8, p. 10.
3. For Oversized Evaporator Fan Speed (rpm), reference Table 9, p. 10.
4. Fan motor heat (MBh) = 3.15 x Fan bhp.
5. Data includes pressure drop due to standard filters and wet coils. No accessories or options are included in pressure drop data.
6. For all non-standard sheave combinations, please refer to accessory installer’s guides ACC-SVN34*-EN and ACC-SVN72*-EN.
7. Factory supplied motors, in commercial equipment, are definite purpose motors, specifically designed and tested to operate reliably and continuously
at all cataloged conditions. Using the full horsepower range of our fan motors as shown in our tabular data will not result in nuisance tripping or
premature motor failure. Our product’s warranty will not be affected.
(a)Unit applications below 320 cfm/ton are only applicable to TZD models without electric heat and YZD models with modulating gas heat. See below for
restrictions.
- Electric heaters restricted on applications below 320 cfm/ton.
- Single zone VAV applications are capable of running below 320 cfm/ton during low speed airflow operation, but "full" airflow must be set to 320 cfm/
ton or higher.
(b)Fan Sheave BK110X1 3/16 and 1VP50X7/8 Required.
(c)Fan Sheave BK110X1 3/16 and 1VP56X7/8 Required.

10 RT-SVF69C-EN
Performance Data
Table 6. Standard motor and drive/fan speed (rpm)
Tons Unit Model Number 6 Turns Open 5 Turns Open 4 Turns Open 3 Turns Open 2 Turns Open 1 Turn Open Closed
12½ T/YZ*150F3,4 452 485 518 551 584 619 N/A
Note: Factory set at 3 turns open.
Table 7. Standard motor and low static fan drive
Tons Unit Model Number 6 Turns Open 5 Turns Open 4 Turns Open 3 Turns Open 2 Turns Open 1Turn Open Closed
12½ T/YZ*150F3,4 351 377 403 429 455 480 N/A
Table 8. Standard motor and high static drive accessory sheave/fan speed (rpm)
Tons Unit Model Number 6 Turns Open 5 Turns Open 4 Turns Open 3 Turns Open 2 Turns Open 1 Turn Open Closed
12½ T/YZ*150F3,4 619 652 685 718 751 786 N/A
Table 9. Oversized motor and drive/fan speed (rpm)
Tons Unit Model Number 6 Turns Open 5 Turns Open 4 Turns Open 3 Turns Open 2 Turns Open 1 Turn Open Closed
12½ T/YZ*150F3,4 695 747 799 851 903 953 N/A
Table 10. Static pressure drop through accessories (inches water column)
Tons Unit Model Number cfm Standard Filters(a)
2”
MERV 8
Filter(b)
2”
MERV 13
Filter(b)
Std
Economizer
with
OA/RA
Dampers(c)
Low Leak
Economizer
with
OA/RA
Dampers(d) Electric Heater Accessory (kW)(e)
100%
OA 100% RA 100% OA 100% RA 5–12 14–27 36 54 72
12½
T/YZH150F 4000 0.01 0.03 0.06 0.10 0.02 0.25 0.04 — 0.06 0.02 0.03 — 5000 0.02 0.04 0.08 0.15 0.03 0.39 0.07 — 0.06 0.04 0.05 —
6000 0.04 0.06 0.10 0.20 0.04 0.57 0.10 — 0.09 0.06 0.07 —
T/YZD150F
2500* 0.01 0.01 0.04 0.05 0.01 0.07 0.04 — * * * —
4000 0.02 0.03 0.07 0.10 0.02 0.16 0.10 — 0.04 0.02 0.03 —
5000 0.03 0.04 0.09 0.15 0.03 0.24 0.16 — 0.06 0.04 0.05 —
6000 0.05 0.06 0.11 0.20 0.04 0.33 0.24 — 0.09 0.06 0.07 —
(a)Tested with: 2” filters.
(b)Difference in pressure drop should be considered when utilizing optional 2” pleated filters.
(c)OA = Outside Air and RA = Return Air.
(d)OA = Outside Air and RA = Return Air.
(e)Nominal kW ratings at 240, 480 volts.
*Unit applications below 320 cfm/ton are only applicable to TZD models without electric heat and YZD models with modulating gas heat. See below
for restrictions.
- Electric heaters restricted on applications below 320 cfm/ton.
- Single zone VAV applications are capable of running below 320 cfm/ton during low speed airflow operation, but "full" airflow must be set to 320
cfm/ton or higher.

RT-SVF69C-EN 11
Sequence of Operation
ReliaTel Controls
• The master module is the ReliaTel Refrigeration
Module (RTRM).
• The RTRM provides compressor anti-short cycle
timing functions through minimum "Off" and "On"
timing to increase reliability, performance and to
maximize unit efficiency.
• Upon power initialization, the RTRM performs self-
diagnostic checks to insure that all internal controls are
functioning. It checks the configuration parameters
against the components connected to the system.
• The LED located on the RTRM module is turned "On"
within one second after power-up if all internal
operations are okay.
• The RTRM in conjunction with the Variable Speed
Module (VSM) will provide capability to control of a
modulating eFlex™ compressor, and two multispeed
outdoor motors (ODM).
• The ReliaTel Options Module (RTOM) is utilized in
conjunction with the RTRM for control of a variable
speed indoor motor (IDM) and optional accessories.
• All units employ a Phase Monitor to ensure proper
power supply connection of phases for compressor
operation. If the monitor senses incorrect phase
connection (phase reversal), a loss of phase, or large
voltage imbalance between phases, all unit operation
will be prevented until the condition is corrected. The
Phase Monitor has green (Ok) and red (Phase Fault)
status LEDs on the face of the monitor. All units are
functional tested to ensure correct factory wiring. A red
status LED is an indication of a serious problem that
can only be resolved by isolating and repairing the
Supply Power fault.
ReliaTel Control Cooling without
an Economizer
When the system switch is set to the "Cool" position and
the zone temperature rises above the cooling setpoint
controlband, the RTRM energizes the modulating eFlex
compressor starting with the minimum compressor motor
speed and runs through a start-up sequence for that
compressor, provided the low pressure control (LPC4),
high pressure control (HPC3), and the discharge line
thermostat (DLT3) are closed. When the eFlex compressor
and the outdoor fan motor are energized, they adjust
motor speeds in order to maintain the zone temperature
(Single Zone VAV) to within +/-0.5°F or Supply Air
Temperature (Multi Zone VAV) to within ±1°F of the sensor
setpoint at the sensed location. If the modulating
compressor at its maximum capacity cannot satisfy the
cooling requirement, the RTRM energizes the first fixed
speed compressor, provided the low pressure control
(LPC1), the high pressure control (HPC1), and the
discharge line thermostat (DLT1) are closed, while
simultaneously reducing the modulating compressor
motor speed to allow a smooth transition in system
capacity. When the fixed speed compressor is energized,
the ReliaTel control starts to maintain the zone
temperature (Single Zone VAV) to within +/-0.5°F or Supply
Air Temperature (Multi Zone VAV) to within ±1°F of the
sensor setpoint at the sensed location by modulating the
eFlex compressor speed and both ODM. If the first two
compressors cannot satisfy the load, the second fixed
speed compressor is energized in addition to the first fixed
speed compressor, provided the low pressure control
(LPC1), the high pressure control (HPC2), and the
discharge line thermostat (DLT2) are closed.
Simultaneously, the modulating compressor speed is
reduced for a smooth transition to the higher system
capacity. When the third compressor is energized, the
ReliaTel control starts to maintain the zone temperature
(Single Zone VAV) to within +/-0.5°F or Supply Air
Temperature (Multi Zone VAV) to within +/-1°F of the
sensor setpoint at the sensed location by modulating the
eFlex compressor motor speed and both ODM.
ReliaTel Control Evaporator Fan
Operation
With the indoor fan in "Auto" mode, the RTRM energizes
the indoor fan motor for approximately 1 second after
energizing the modulating compressor in the cooling
mode. In the heating mode, the RTRM energizes the indoor
fan motor approximately 45 seconds after gas ignition (gas
heat unit) or 1 second before energizing electric heat
(electric heat unit). With the indoor fan in "On" mode, the
RTRM keeps the indoor fan energized for continuous fan
motor operation. When the unit is equipped with the
optional clogged filter switch, wired to the ReliaTel Options
Module (RTOM), the RTRM produces an analog signal
output if the clogged filter switch closes for two minutes
after a request for fan operation. When the system is
connected to a remote panel, the "SERVICE" LED will be
turned on when this failure occurs.
Drain Pan Condensate Overflow Switch
(Optional)
This input incorporates the Condensate Overflow Switch
(COF) mounted on the drain pan and the ReliaTel Options
Module (RTOM). When the condensate level reaches the
trip point for 6 continuous seconds, the RTOM will shut
down all unit function until the overflow condition has
cleared. The unit will return to normal operation after 6
continuous seconds with the COF in a non-tripped
condition. If the condensate level causes the unit to
shutdown more than 2 times in a 3 day period, the unit will
be locked-out of operation. A manual reset of the

12 RT-SVF69C-EN
Sequence of Operation
diagnostic system through the Zone Sensor or Building
Automation System will be required. Cycling unit power
will also clear the fault.
Low Ambient Operation
During low ambient operation, outside air temperature
below 40°F, the RTRM will cycle the compressors and
outdoor fan motors "Off" for approximately 3 minutes after
every 10 minutes of accumulated compressor run time.
The indoor fan motor will continue to operate during this
evaporator defrost cycle and the compressors and
outdoor fans will return to normal operation once the
defrost cycle has terminated and the compressor "Off"
time delay has been satisfied.
ReliaTel Control Cooling with
an Economizer
The economizer is utilized to control the zone temperature
providing the outside air conditions are suitable. Outside
air is drawn into the unit through modulating dampers.
When cooling is required and economizing is possible, the
RTRM sends the cooling request to the unit economizer
actuator to open the economizer damper.
The RTRM tries to cool the zone utilizing the economizer to
slightly below the zone temperature setpoint. If the mixed
air sensor (MAS) senses that the mixed air temperature is
below 53°F, the damper modulates toward the closed
position.
If the zone temperature continues to rise above the zone
temperature setpoint controlband and the economizer
damper is fully open, the RTRM energizes the modulating
eFlex compressor. If the zone temperature continues to
rise above the zone temperature setpoint controlband and
the economizer damper is fully open, the RTRM instructs
the compressor inverter drive to increase the compressor
speed to allow more compressor capacity.
If the eFlex compressor is running at its maximum
capacity and the zone temperature continues to rise above
the zone temperature setpoint controlband and the
economizer damper is fully open, the RTRM energizes the
first fixed speed compressor, while simultaneously
instructing the compressor inverter drive to decrease the
eFlex compressor capacity to allow a smooth system
capacity transition. If the zone temperature continues to
rise above the zone temperature setpoint controlband and
the economizer damper is fully open, the RTRM instructs
the compressor inverter drive to increase the eFlex
compressor speed to allow more compressor capacity.
If the eFlex compressor is running at its maximum
capacity and the zone temperature continues to rise above
the zone temperature setpoint controlband and the
economizer damper is fully open, the RTRM energizes the
second fixed speed compressor, while simultaneously
decreasing the eFlex compressor speed to allow a smooth
transition of system cooling capacity.
All compressor capacity transitions are accompanied by
corresponding IDM and ODM speed adjustments to allow
optimal unit cooling performance. The ECA continues to
modulate the economizer damper open/closed to keep the
mixed air temperature that is calculated by the RTRM.
If economizing is not possible, the ECA drives the damper
to the minimum position setpoint when the indoor fan
relay is energized and allows mechanical cooling
operation. When the unit is equipped with the optional fan
failure switch, wired to the RTOM, the RTRM will stop all
cooling functions and produce an analog output if the fan
failure switch does not open within 40 seconds after a
request for fan operation. When the system is connected
to a remote panel, the "SERVICE" LED will flash when this
failure occurs.
Economizer Set-Up
Adjusting the minimumposition potentiometer located on
the unit economizer actuator (ECA) sets the required
amount of ventilation air.
Two of the three methods for determining the suitability of
the outside air can be selected utilizing the enthalpy
potentiometer on the ECA, as described below:
1. Ambient Temperature-Controlling the economizing
cycle by sensing the outside air dry bulb temperature.
Ta b l e 11 lists the selectable dry bulb values by
potentiometer setting.
2. Reference Enthalpy-Controlling the economizer cycle
by sensing the outdoor air humidity. Tab le 11 lists the
selectable enthalpy values by potentiometer setting. If
the outside air enthalpy value is less than the selected
value, the economizer is allowed to operate.
3. Comparative Enthalpy-By utilizing a humidity sensor
and a temperature sensor in both the return air stream
and the outdoor air stream, the unit control processor
(RTRM) will be able to establish which conditions are
best suited for maintaining the zone temperature, i.e.
indoor conditions or outdoor conditions.
The potentiometer located on the ECA is non-functional
when both the temperature and humidity sensors are
installed.
Table 11. Potentiometer settings
Potentiometer
Setting Enthalpy Dry Bulb
A 27 Btu/lb (63 kJ/kg) 73°F (22.8°C)
B 25 Btu/lb (58 kJ/kg) 70°F (21.1°C)
C(a)
(a)Factory setting
23 Btu/lb (53 kJ/kg) 67°F (19.4°C)
D 22 Btu/lb (51 kJ/kg) 63°F (17.2°C)
E 19 Btu/lb (44 kJ/kg) 55°F (12.8°C)

RT-SVF69C-EN 13
Sequence of Operation
ReliaTel Control Heating Operation for
Cooling Only Units
When the system switch is set to the "Heat" position and
the zone temperature falls below the heating setpoint
controlband, the RTRM energizes the first stage of electric
heat. If the first stage of electric heat cannot satisfy the
heating requirement, the RTRM energizes the second
stage electric heat if applicable. The RTRM cycles both the
first and second stages of heat "On" and "Off" as required
to maintain the zone temperature setpoint.
ReliaTel Control Heating Operation for Gas
Units
When the system switch is set to the "Heat" position and
the zone temperature falls below the heating setpoint
controlband, a heat cycle is initiated when the RTRM
communicates ignition information to the Ignition
module.
Modulating Gas Heat 2.5:1 Turndown
In a modulating heat unit, when a call for heat is received,
the burner will light at full fire (100%). After the burner is
lit, the unit controls will monitor the discharge air
temperature and modulate the input rate down to match
the load.
Ignition Control Module
Two-Stage (IGN) runs self-check (including verification
that the gas valve is de-energized). IGN checks the high-
limit switches (TC01 and TC02) for normally closed
contacts. With power supplied to the ignition module, the
hot surface ignition probe is Preheated. The gas valve is
energized for a few seconds for trial for ignition, to ignite
the burner. Once the burner is ignited, the hot surface
ignition probe is de-energized by the ignition module and
functions as the flame sensing device. If the burner fails to
ignite, the ignition module will attempt two retries before
locking out. The green LED will indicate a lockout by two
fast flashes. An ignition lockout can be reset by:
1. Opening for 3 seconds and closing the main power
disconnect switch.
2. By switching the "Mode" switch on the zone sensor to
"OFF" and then to the desired position.
3. Allowing the ignition control module to reset
automatically after one hour. Refer to Ta b l e 12 for the
LED diagnostic definitions.
When the fan selection switch is set to the "Auto" position,
the RTRM energizes the indoor fan relay coil
approximately 30 seconds after initiating the heating cycle
to start the indoor fan motor. The automatic reset high
limit, located in the bottom right corner of the burner
compartment, protects against abnormally high leaving
air temperatures. The automatic reset fan fail limit, located
in the upper middle section of the indoor fan board,
protects against abnormally high heat buildup which
could occur because of extended cycling of the high limit
or if the indoor fan motor fails to operate. Should TCO2
open, the RTRM will energize the indoor fan relay in an
attempt to start the fan motor. The RTRM signals that a
heat failure has occurred by flashing the "Heat" LED on the
zone sensor. There is a green LED located in the Ignition
Control Module. Ta b l e 1 2 lists the diagnostics and the
status of the LED during the various operating states.
Ignition Control Module Diagnostics
At any time the control is powered, a green LED indicator
light shall be lit using the following signal:
Enhanced Dehumidification
Note: Enhanced Dehumidification is not be supported on
Multiple Zone VAV.
Enhanced Dehumidification is available on all units
equipped with a Space Humidity sensor. Once the Space
Humidity value exceeds the Dehumidification Setpoint
and dehumidification is enabled the unit will transition to
the Enhanced Dehumidification mode. If the unit is
actively cooling, the ReliaTel control will latch the current
compressor operation and reduce the current indoor
airflow. If the unit is not actively cooling when the
Enhanced Dehumidification mode is activated, the unit
will energize a single fixed speed compressor and the
modulating eFlex compressor will ramp to a fixed speed
while engaging the IDM and both ODM at the appropriate
airflow for that condition. If during active enhanced
dehumidification the Space Humidity falls below the
Dehumidification Setpoint – 2%, Dehumidification will be
terminated and the unit will transition back to normal
Cooling or Heating control.
Table 12. Ignition module diagnostics
Steady OFF: No Power/Failure/Internal Failure
Steady ON: Normal
Slow Flash Rate: Normal, call for heat (¾ second on, ¼ second
off).
Fast Flash Rate: Used for error indication only (¼ second off, ¾
second on).
Error Code Fast Flash Rate:
1 Flash Communication Issue between Refrigeration
Module and 3SH control.
2 Flashes System Lockout: Failed to detect or sustain
flame.
3 Flashes Not implemented.
4 Flashes High Limit switch protection device open.
5 Flashes Flame sensed and gas valve not energized or
flame sensed and no call for heat.
6 Flashes Not implemented.
Note: The pause between groups of fast flashes is approximately two
seconds. Additionally, the LED indicator light shall flash for one
second at power-up.

14 RT-SVF69C-EN
Sequence of Operation
Single Zone Variable Air Volume
(Single Zone VAV) Control
For normal Cooling operation, available cooling capacity
will be modulated in order to meet the calculated
discharge air setpoint between the user selected upper
and lower limits. If the current active cooling capacity is
controlling the discharge air within the deadband no
additional Cooling capacity change will be requested. As
the Discharge Air Temperature rises above the deadband
the control will request additional capacity as required
(additional compressor operation or economizer). As the
Discharge Air Temperature falls below the deadband the
algorithm will request a reduction in active capacity.
Cooling Operation
If the control determines that there is a need for
compressor operation in order to meet the discharge air
requirements, once supply fan proving has been made,
the unit will begin to modulate compressors. As the zone
cooling demand continues to increase, if additional
capacity is required, the supply fan output will be
modulated above minimum speed in order to meet the
zone requirements.
Note: The supply fan speed will remain at the activated
compressors’ associated minimum value until the
control requires additional capacity to meet the
zone demand.
As the cooling load in the zone decreases the control will
reduce the speed of the fan down to minimum per
compressor operation and control the compressor
outputs accordingly. As the compressors begin to de-
energize, the Supply Fan speed will fall back to the Cooling
Capacity's associated minimum fan speed but not below.
As the load in the zone continues to drop, cooling capacity
will be reduced in order to maintain the calculated
discharge air setpoint.
Economizer Cooling
During normal Economizer Cooling, the fan speed will
operate at its minimum. However, if the economizer is able
to meet the demand alone, due to desirable ambient
conditions, the supply fan speed will be allowed to
increase above the minimum prior to utilizing mechanical
cooling. Note that Economizer Enable/Disable decisions
will be made based on the previous sections; however, the
economizer control point will now be variable based on
the zone cooling demand.
Demand Controlled Ventilation
Units configured for SZVAV and Demand Controlled
Ventilation (CO2sensor value available) require a new
control scheme comprised of 2 existing schemes that have
been traditionally mutually exclusive; DCV and OA CFM
Compensation. Units configured with DCV will invoke the
new Demand Controlled Ventilation scheme which allows
variable Bldg. Design and DCV Minimum Positions and OA
Damper Position Target setpoints based on the supply fan
speed and space CO2requirements.
Economizer Damper Position Set-Up with
DCV
This new scheme will require the setting of 5 OA Damper
position setpoints; 3 more than on non-SZ VAV. These new
setpoints are located on the RTVM module:
1. Design Min Position @ Minimum Fan Speed
Command (RTVM R130)
2. Design Min Position @ Middle Fan Speed Command
(RTVM R136)
3. Design Min Position @ Full Fan Speed Command
(RTEM Design Min Position)
4. DCV Min Position @ Minimum Fan Speed Command
(RTVM R41)
5. DCV Min position @ Full Fan Speed Command (RTEM
DCV Min Position)
As the supply fan speed command varies between
minimum and maximum, the Building Design and DCV
Minimum Position Targets will be calculated between the
user selected setpoints based on the instantaneous supply
fan speed. The Bldg. Design and DCV Minimum Position
Targets will be used to calculate the Active OA Damper
Minimum Position Target, as on traditional units, based on
the Space CO2 relative to the active Design and DCV CO2
setpoints.
By default, the Design Minimum Position schedule will be
a linear line through all user selectable Design Minimum
Position setpoints. The user will have the ability to set the
Design Minimum Position at Middle fan speed command
to a point that would be lower than the calculated linear
line between the Design Minimum Position setpoints at
0% and 100% fan speed command in order to compensate
for the non-linear outside airflow through the fan and
damper modulation range. However, if the Design
Minimum Position at Middle fan speed command is set to
a point that would be higher than the calculated linear line
between the Design Minimum Position setpoints at
Minimum and Full fan speed command, the minimum
position will be limited to the point that would make the
Design Minimum Position schedule linear.
Provisions have been made in Service Test Mode to allow
for proper damper minimum position setup:
1. To set the Design and DCV Minimum Position setpoints
at Minimum Fan Speed, set the unit to operate at Step
1 (Fan ON) or Step 2 (Economizer Open) and make the
proper adjustments.
2. To set the Design Minimum Position setpoint at Middle
Fan Speed, set the unit to operate at Step 3 (Cool 1) and
make the proper adjustment.

RT-SVF69C-EN 15
Sequence of Operation
3. To set the Design and DCV Minimum Position setpoints
at Full Fan Speed, set the unit to operate at Step 4 (Cool
2) and make the proper adjustments.
Economizer Damper Position Set-Up
without DCV
For units not configured with DCV (no CO2sensor value
available), additional minimum position setpoints to
increase outdoor airflow accuracy will be supported. The
operation will be similar to OA CFM Compensation on
Traditional VAV units with the addition of a Design
Minimum Position setpoint at Middle Fan Speed
Command. The following setpoint potentiometers will be
used on the RTEM:
1. Design Min at Minimum Fan Speed Command (RTEM
DCV Min)
2. Design Min at Middle Fan Speed Command (RTEM
DCV Setpoint LL)
3. Design Min at Full Fan Speed Command (RTEM Design
Min)
The controller will calculate the active OA Damper
Minimum position between the user-selected setpoints
based on the supply fan speed command. By Default, the
Design Minimum Position schedule will be a linear line
through all user selectable Design Minimum Position
setpoints. As with Demand Controlled Ventilation, if the
Design Minimum Position at Middle fan speed command
is set to a point that would be higher than the calculated
linear line between the Design Minimum Position
setpoints at Minimum and Maximum fan speed
command, the minimum position will be limited to the
point that would make the Design Minimum Position
schedule linear.
Provisions have been made in Service Test Mode to allow
for proper damper minimum position setup:
1. To set the Design Minimum Position setpoint at
Minimum Fan Speed, set the unit to operate at Step 1
(Fan ON) or Step 2 (Economizer Open) and make the
proper adjustment.
2. To set the Design Minimum Position setpoint at Middle
Fan Speed, set the unit to operate at Step 3 (Cool 1) and
make the proper adjustment.
3. To set the Design Minimum Position setpoint at Full
Fan Speed, set the unit to operate at Step 4 (Cool 2) and
make the proper adjustment.
Heating Operation
Heating operation on units configured with Single Zone
VAV control will utilize two separate control
methodologies based on heating configurations. For all
"Staged" Heating types (Electric and Gas), the unit will
utilize 100% full airflow during all active heating periods
like traditional Constant Volume units. For Modulating Gas
heat units, the unit will have the ability to control the
discharge air temperature to the calculated discharge air
heating setpoint in order to maintain the Zone
Temperature to the Zone Heating setpoint.
Staged Heating Operation
For units configured with Staged Heat once the control
determines that there is an active heating capacity
request, the unit will energize the Supply Fan and ramp up
to full speed. The control methodology during Active
Heating on units configured with Staged Heat types will be
identical to traditional Constant Volume units; heating
stages will be energized/de-energized to meet the Zone
Heating demand.
Note: All Electric and Gas Heat staging sequences will be
identical to Constant Volume unit staging
sequences.
Modulating Heat Operation with SZVAV
Heating
Units configured with Modulating Gas Heat will utilize true
Single Zone VAV control in the same manner as during
Active Cooling.
Heating Sequence
Once the unit control determines that there is a space
heating demand, the unit will transition into zone heating.
Once the Discharge Air Temperature falls below the
calculated discharge air temperature setpoint, the unit will
initiate the Modulating Heat output request and control
the supply fan at minimum speed. At this point, the
Modulating Heat output will be controlled to maintain the
discharge air temperature requirements and the supply
fan speed will be controlled between 63%-100% to meet
the zone heating requirements.
As the heating load in the zone decreases the fan speed
will decrease down to minimum (63%) and control the
modulating heat output as necessary to meet the
discharge air heating requirements. As the load in the zone
continues to drop the fan speed will be maintained at this
minimum airflow and the modulating heat output will be
controlled accordingly.
Low Ambient Operation
The indoor fan motor (IDM) will operate at 100% fan speed
during this evaporator defrost cycle (EDC) and the
compressor and outdoor fan will return to normal
operation once the defrost cycle has terminated and the
compressor "Off" time delay has been satisfied.
Clogged Filter Option
The unit mounted clogged filter switch monitors the
pressure differential across the return air filters. It is
mounted in the indoor section and is connected to the
RTOM. The clogged filter switch is normally open and will
automatically close when the pressure differential across
the filters falls below the clogged filter setpoint. The RTOM
will generate a SERVICE diagnostic that will be sent to the

16 RT-SVF69C-EN
Sequence of Operation
zone sensor or remote panel when the clogged filter switch
has been closed for at least 2 minutes during supply fan
operation. The system will continue to operate regardless
of the status of the clogged filter switch.
Ventilation Override
Note: Applying 24 volts to one of the three Ventilation
Override inputs manually activates ventilation
override. One input is provided to request the
Pressurize Mode, the second input the Purge Mode,
and the third input the Exhaust Mode.
When the Pressurize Mode is selected, activating
Ventilation Override will cause the supply fan to run, the
economizer to open to 100%, the exhaust fan to turn
(remain) off, or the VFD to run at full speed, and the VAV
boxes to fully open.
When Purge is selected, activating Ventilation Override
will cause the supply fan to run, the economizer to open to
100%, the exhaust fan to run, or the VFD to run at full
speed, and the VAV boxes to fully open.
When Exhaust is selected, activating Ventilation Override
will cause the supply fan to turn off, the economizer to
close to 0%, the exhaust fan to run (exhaust damper at
100% if configured for Statitrac), or the VFD to stop, and
the VAV boxes to operate normally.
If more than one mode is requested at the same time, the
Pressurize request will have priority followed by Purge.
When any Ventilation Override Mode is active, all heating
and cooling is turned off. For the case where the unit is
required to turn off, the Emergency Stop input is used. The
ICS can also initiate any ventilation override mode.
Ta b l e 1 3 lists the sequence of events within the system for
each ventilation mode. Refer to the unit wiring diagram for
contact switching and wiring.
Note: Fresh air tracking will not work with VOM.
Emergency Stop
When this binary input is opened, all outputs are
immediately turned off and the system will not be allowed
to restart until the binary input is closed for approximately
5 seconds minimum. The shutdown is communicated to
Tracer™ if applicable and the Heat and Cool LED outputs
(RTRM J6-7 and J6-8) will blink at a nominal rate of 1 blink
per second.
Phase Monitor
The Phase Monitor is a 3 phase line monitor module that
protects against phase loss, phase reversal and phase
unbalance. It is intended to protect compressors from
reverse rotation. It has an operating input voltage range of
190-600 VAC, and LED indicators for ON and FAULT. There
are no field adjustments and the module will automatically
reset from a fault condition.
Low Pressure Control
This input incorporates the low pressure cutout of each
refrigeration circuit and can be activated by opening a field
supplied contact.
If this circuit is open before a compressor(s) is started, the
compressor(s) in that circuit will not be allowed to operate.
Anytime this circuit is opened for 5 continuous seconds,
the compressor(s) in that circuit are turned off
immediately. The compressor(s) will not be allowed to
restart for a minimum of 3 minutes.
If four consecutive open conditions occur during the first
three minutes of operation, the compressor(s) in that
circuit will be locked out, a diagnostic communicated to
Tracer, and a manual reset will be required to restart the
compressor(s).
High Pressure Cutout and Temperature
Discharge Limit
The high pressure controls and temperature discharge
limit are wired in series between the compressor outputs
on the RTRM and the compressor contactors. If the high
pressure safety or temperature discharge limit opens, the
compressor(s) on the affected circuit is locked out. If the
compressor output circuit is opened four consecutive
times during compressor operation, the RTRM will
generate a manual reset lockout.
Coil Frost Protection
The Frostat™ control monitors the evaporator coil
temperature to prevent the evaporator from freezing due
to low operating temperatures whenever there is a
demand for cooling. When a closed circuit has occurred for
5 seconds minimum, the RTRM turns off all of the cooling
outputs. The Supply Fan will be held “On” until the Frostat
has been opened for 5 continuous seconds or for 60
seconds after the last compressor was shut “Off”,
whichever is the longest. The compressor shutdown is
communicated to Tracer, if applicable. There is no local
diagnostic for this condition.
Table 13. Ventilation override sequence
Mode and Priority
Affected Function Pressurize Purge Exhaust(a)
(a) Exhaust mode 3 is not available with the tracking power exhaust option.
123
Heat/Cool off off off
VFD full speed full speed full speed
SupplyFanononoff
Exhaust Fan off on(b)
(b)For units configured with the Statitrac option, the Exhaust Damper will
open during Ventilation Override modes that request the exhaust fan to
operate.
on
Economizer open open closed
VAV Boxes forced open forced open normal
operation

RT-SVF69C-EN 17
Sequence of Operation
Failure and Override Modes
Certain failure and overriding conditions require special
handling of the Supply Fan Speed on units configured with
Single Zone VAV. See below for a list of these conditions:
• Supply Fan Proving Failure - If a Supply Fan Proving
failure is detected, the Supply Fan will be de-energized
after 40s of run time and the Fan Speed output will go
to 0 Vdc (0%).
• Ventilation Override Mode - If a VOM goes active in
which the Supply Fan is commanded ON (Purge,
Pressurize, etc.), the Supply Fan will be energized and
the Fan Speed output will ramp to 100%.
• Zone Temperature Sensor Failure - If the Active Zone
Temperature input goes out of range, the unit will
discontinue all Heating, Cooling, and Dehumidification
operation.
• Supply Air Temperature Sensor Failure - If the Supply
Air Temperature input goes out of range, the unit will
revert back to Full Airflow, Traditional CV control. The
unit will call out a Supply Air Temperature Sensor
Failure Alarm, the RTRM System LED will flash the 2-
blink error code, and the Zone Sensor Heat
(Modulating Heat Only) and Cool LEDs will flash.
• Frostat Failure - If a Frostat failure occurs, all active
Heating, Cooling, and Dehumidification will be de-
energized immediately and the Supply Fan will ramp
up to 100%.
• Heat Failure (High Temp. Limit Trip) - If a unit
configured with Gas Heat has a High Temp. Limit trip,
the Supply Fan will be requested to remain ON and the
Fan Speed output will ramp to full speed.
Variable Air Volume Applications
(Traditional VAV)
Supply Air Temperature Control -
Occupied Cooling and Heating
The RTRM is designed to maintain a selectable supply air
temperature of 40°F to 90°F with a +/- 3.5°F deadband.
Note: To reduce the risk of coil freezing, it is not
recommended to set the supply air temperature
below 50°F.
In cooling, if supply air temperature is more than 3.5
degrees warmer than the selected temperature, a stage of
cooling will be turned “On” (if available). Then if the
supply air temperature is more than 3.5 degrees cooler
than the selected temperature, a stage of cooling will be
turned “Off”. At very low airflows the unit may cycle stages
“On” and “Off” to maintain an average discharge air
temperature outside the 7 degree deadband.
If the unit has modulating heat, the unit can be made to do
discharge heating with VAV control. This is done by
placing a contact closure across the “Changeover Input”
on the RTAM. During this mode, the unit will heat to the
Supply Air Heating Setpoint +/- 3.5°F. During low load or
low airflow conditions the actual temperature swing of the
discharge air will likely be greater.
The RTRM utilizes a proportional and integral control
scheme with the integration occurring when the supply air
temperature is outside the deadband. As long as the
supply air temperature is within the setpoint deadband,
the system is considered to be satisfied and no staging up
or down will occur.
Supply Air Temperature Control with an
Economizer
The economizer is utilized to control the supply air cooling
at +1.5°F around the supply air temperature setpoint range
of 40°F and 90°F providing the outside air conditions are
suitable. While economizing, the mechanical cooling is
disabled until the economizer dampers have been fully
open for three minutes. If the economizer is disabled due
to unsuitable conditions, the mechanical cooling will cycle
as though the unit had no economizer.
VHR Relay Output
During unoccupied mode, daytime warm-up (DWU) and
morning warm-up (MWU) the VFD will open to 100%. All
VAV boxes must be opened through an ICS program or by
the VHR wired to the VAV boxes. The RTRM will delay
100% fan operation approximately 6.5 minutes when
switching from occupied cooling mode to a heating mode.

18 RT-SVF69C-EN
Sequence of Operation
Zone Temperature Control without
a Night Setback Panel or ICS - Unoccupied
Cooling
When a field supplied occupied/unoccupied switching
device is connected between RTRM J6-11 and RTRM J6-12,
both the economizer and the mechanical cooling will be
disabled.
Zone Temperature Control without
a Night Setback Panel or ICS - Unoccupied
Heating
When a field supplied occupied/unoccupied switching
device is connected between RTRM J6-11 and J6-12 and
DWU is enabled, the zone temperature will be controlled at
10°F below the Morning Warm-up setpoint, but not less
than 50°F, by cycling one or two stages of either gas or
electric heat, whichever is applicable.
Morning Warm-up (MWU) Control
Morning Warm-up is activated if the zone temperature is at
least 1.5°F below the MWU setpoint whenever the system
switches from Unoccupied to Occupied status. The MWU
setpoint may be set from the unit mounted potentiometer
or a remotely mounted potentiometer. The setpoint
ranges are from 50°F to 90°F. When the zone temperature
meets or exceeds the MWU setpoint, the unit will switch to
the “Cooling” mode. The economizer will be held closed
during the morning warm-up cycle.
Daytime Warm-up (DWU) Control
Daytime Warm-up is applicable during occupied status
and when the zone temperature is below the initiation
temperature. It can be activated or deactivated through
ICS or a night setback zone sensor. If ICS or a night setback
zone sensor is not utilized, DWU can be activated by
setting the DWU enable DIP switch (RTAM) to ON and
supplying a valid morning warm-up setpoint. The unit is
shipped with a Morning Warm-up setpoint configured and
the Daytime Warm-up function is activated (switch on).
Opening the DWU enable switch will disable this function.
If the system control is local, the DWU initiation setpoint is
3°F below the Morning Warm-up setpoint. The termination
setpoint is equal to the Morning Warm-up setpoint. If the
system control is remote (Tracer™), the DWU setpoint is
equal to the Tracer Occupied heating setpoint. The
initiation and termination setpoints are selectable
setpoints designated by Tracer. When the zone
temperature meets or exceeds the termination setpoint
while the unit is in an Occupied, “Auto” Mode or switched
to the “Cooling” Mode, the unit will revert to the cooling
operation. If an Occupied “Heating” Mode is selected, the
unit will only function within the DWU perimeters until the
system is switched from the “Heat” Mode or enters an
Unoccupied status.
Note: When a LCI is installed on a VAV unit, the MWU
setpoint located on the RTAM board is ignored. The
MWU and DWU setpoints come from the higher
priority LCI-R DAC.
Supply Duct Static Pressure Control
The supply duct static pressure is measured by a
transducer with a 0.25 to 2.125 Vdc proportional output
which corresponds to an adjustable supply duct static
pressure of 0.3" w.c. to 2.5" w.c. respectively with a
deadband adjustment range from 0.2" w.c. to 1.0" w.c. The
setpoint is adjustable on the RTAM Static Pressure
Setpoint potentiometer or through ICS.
Example:
Supply Duct Static setpoint = 2.0" w.c. (RTAM)
Deadband = 0.2" w.c. (RTAM)
Duct Static Control Range = 1.9" w.c. to 2.1" w.c.
Mechanical Cooling with an Economizer
The economizer is utilized to control the zone temperature
when the outside air conditions are suitable. The method
used to determine economizer effectiveness, depending
on the available data, is described below in descending
order of complexity.
The most sophisticated method available is always used.
Two of the three methods for determining the suitability of
the outside air can be selected utilizing the potentiometer
on the Economizer Actuator, as described below:
1. Ambient Temperature - controlling the economizing
cycle by sensing the outside air dry bulb temperature.
Table 14. Variable air volume mode operation
System Mode Fan “Auto” Fan “On”
Heat DWU Active
DWU Off DWU2
Off4DWU2
VAV Heating4
Cool VAV Cooling1VAV Cooling1
Auto DWU Active
DWU Off
DWU or
Cooling1,2,3,4
VAV Cooling1
DWU or
Cooling1,2,3,4
VAV Cooling or
Heating1
Off Off4Off4
Notes:
1. If Cooling is selected the supply fan will run continuously. If VAV
Heating is activated the supply fan will run continuously.
2. If Daytime Warmup is Activated, the supply fan will run
continuously.
3. Auto changeover between Cooling and Daytime
Warmup depends upon the DWU initiate setpoint.
4. The fan will be Off any time the system selection switch
is “Off”.
Table 15. Economizer effectiveness
Method used to determine
economizer effectiveness Required
Comparative Enthalpy OAT, OAH, RAT, RAH
Reference Enthalpy OAT, OAH
Reference Dry Bulb OAT
Unable to determine effectiveness OAT data is invalid or
unavailable

RT-SVF69C-EN 19
Sequence of Operation
Ta b l e 1 6 lists the selectable dry bulb values by
potentiometer setting.
2. Reference Enthalpy - controlling the economizer cycle
by sensing the outdoor air humidity. Ta b l e 16 lists the
selectable enthalpy values by potentiometer setting. If
the outside air enthalpy value is less than the selected
value, the economizer is allowed to operate.
3. Comparative Enthalpy - By utilizing a humidity sensor
and a temperature sensor in both the return air stream
and the outdoor air stream, the economizer will be able
to establish which conditions are best suited for
maintaining the zone temperature, i.e., indoor
conditions or outdoor conditions.
Off Mode
This mode is set at the zone sensor or by ICS. During this
status, no heating, ventilation, or mechanical cooling is
being performed. When switching the “System” selector
to the “Off” mode from any other mode, any diagnostic
data and diagnostic indication signal will be retained as
long as the system remains in the “Off” status. Switching
the “System” selector from the “Off” mode back to any
other mode of operation will reset all diagnostics.
Heating Operation
Heating operation on units configured with Traditional
Multi-Zone VAV control will utilize two separate control
methodologies based on heating configurations. For all
“Staged” Heating types (Electric and Gas), the unit will
utilize 100% full airflow during all active heating periods
like traditional Constant Volume units. If the unit has
modulating heat, the unit can be made to do discharge
heating with VAV control. This is done by placing by
placing a contact closure across the “Changeover Input”
on the RTAM. During this mode, the unit will heat to the
Supply Air Heating Setpoint ± 3.5°F. During low load or low
airflow conditions the actual temperature swing of the
discharge air will likely be greater.
Zone Temperature - Unoccupied Heating
While a building is in an unoccupied period as designated
by a remote panel with night setback or ICS, the necessary
heating capacity will be controlled to maintain the zone
temperature to within the unoccupied setpoint deadband.
For traditional VAV systems, the VFD will operate at 100%
during this mode. It will be necessary to drive VAV boxes
to their maximum position through ICS programming or
the factory provided VHR relay. For Modulating Gas Heat
units, Full Airflow is not required but can be enabled by
connecting the changeover mode input J5-1 and J5-2 on
the RTAM module. For all Staged Heating types, the
Supply Fan will be controlled at maximum fan speed
during active heating operation as during Occupied
periods.
Gas Heat Control
The ignition sequence and timing are provided by a
separate heat control module. The RTRM only provides
the heating outputs to initiate 1st and 2nd stages and
control the combustion blower relay. Both stages of the
furnace will start and operate for one minute and then
cycle back if only one stage is required. Units with
modulating heat capabilities will light on high fire for one
minute and then modulate to the appropriate heating rate
for the building load present.
Electric Heat Control
The RTRM provides two heating outputs for 1st and 2nd
stages that will be controlled with at least a 10 seconds
delay between each stage. When the fan selection switch
is in the “AUTO” mode, the fan will start approximately 1
second before the 1st heater stage is activated. The fan
and heater will cycle off after the heating setpoint has been
satisfied. Once the Zone Heating requirements have been
satisfied, the fan and heat outputs will be controlled off.
Table 16. Economizer configuration
Selection Dry Bulb Enthalpy Value
A 73°F 27 BTU/LB Air
B 70°F 25 BTU/LB Air
C 67°F 23 BTU/LB Air
D 63°F 22 BTU/LB Air
E 55°F 19 BTU/LB Air

20 RT-SVF69C-EN
Pressure Curves
Refrigerant Charging Procedure
1. Weigh the refrigerant charge into the liquid line
Schrader fitting. Proper unit charge is listed on the unit
serial data plate.
2. Liquid line charging is the preferred charging method
to minimize starting the compressor with liquid
refrigerant in the compressor oil sump. Never charge
liquid into the low side of the system while the
compressor is not operating. Never charge refrigerant
into the compressor discharge schrader fitting.
3. R-410a must only be charged in the liquid state.
To Check Operating Pressures
1. Enter the stage of the “Service Test Mode” of the unit
that brings on all compressors in the cooling mode.
Allow all compressors to run long enough for the
pressures to stabilize.
2. Measure the liquid line temperature of each circuit
near the condenser coil after pressures stabilize.
3. Measure the liquid line pressure of each circuit after
pressures stabilize.
4. Use the chart below to plot the measurements taken
and to determine any charge adjustment.
WARNING
Refrigerant under High Pressure!
System contains oil and refrigerant under high
pressure. Recover refrigerant to relieve pressure before
opening the system. See unit nameplate for refrigerant
type. Do not use non-approved refrigerants, refrigerant
substitutes, or refrigerant additives. Failure to recover
refrigerant to relieve pressure or the use of non-
approved refrigerants, refrigerant substitutes, or
refrigerant additives could result in an explosion which
could result in death or serious injury or equipment
damage.