heat-timer Genesis User manual

INSTALLATION AND
OPERATION MANUAL
059705–00 REV. B
FOR STEAM OR HYDRONIC HEATING SYSTEMS
GENESIS HEAT-TIMER®
LIGHT COMMERCIAL INTERNET BASE CONTROL

WARNING
The Genesis Heat-Timer®is strictly an operating control. It
can CANNOT be used as a limit control. All boilers must
have all safety and limit controls required by code. It is the
responsibility of the installer to verify that all the safety and
limits are working properly.
This control must be installed by a licensed electrician.

TABLE OF CONTENTS
01 DETAILED OPERATION 6
OVERVIEW 6
APPLICATIONS 6
RADIANT HEATING 6
STEAM TO WATER HEAT-EXCHANGERS 6
BURNER CONTROL 6
DISTRICT STEAM 6
STEAM HEATING 6
02 HYDRONIC HEATING 7
UNDERSTANDING OPERATION CONCEPT 7
RESET RATIO/OUTDOOR RESET 8
HYDRONIC HEATING FEATURES 9
SYSTEM TEMPERATURE OFFSET 9
NIGHT (SLEEP) SETBACK 9
BOOST AND EARLY SHUTDOWN 9
SYSTEM PUMP RUN-ON 9
SCHEDULES 9
03 STEAM HEATING 10
UNDERSTANDING OPERATION CONCEPT 10
THE “CYCLE” CONCEPT 10
CYCLE LENGTH BASED ON OUTDOOR
TEMPERATURE 10
CYCLE LENGTH 11
TABLE 1: CYCLE LENGTH TABLE 12
SEQUENCE OF BURNER/VALVE OPERATION 13
SEQUENCE OF DISTRICT STEAM OPERATION 13
STEAM HEATING FEATURES 14
STEAM OUTDOOR RESET 14
NIGHT (SLEEP) SETBACK 14
DAY AND NIGHT SCHEDULES 14
SYSTEM OUTPUT 14
BOOST AND EARLY SHUTDOWN 14
04 SPACE FEEDBACK 15
UNDERSTANDING OPERATION CONCEPT 15
SPACE TEMPERATURE FEEDBACK— 15
HYDRONIC HEATING
SPACE TEMPERATURE FEEDBACK— 15
STEAM HEATING
05 INPUTS 16
HEATING SYSTEM SENSOR 16
OUTDOOR TEMPERATURE SENSOR 16
AUX 1, AUX 2 AND AUX 3 16
DHW CALL 16
06 OUTPUTS 17
VALVE ACTUATOR 17
BOILER BURNER 17
BURNER MODULATION 17
SYSTEM PUMP—HYDRONIC 17
SYSTEM PUMP (OUTPUT)—STEAM 17
MODEM 17
07 CONTROL LAYOUT 18
08 SPECIFICATIONS 19
GENESIS HEAT-TIMER®CONTROL 19
09 SPACE SENSOR 20
SPECIFICATIONS 20
10 INSTALLATION INSTRUCTIONS 21
SUPPLIED MATERIALS 21
REQUIRED MATERIALS (NOT SUPPLIED) 21
DESIGN CONSIDERATIONS 21
11 INSTALLATION 22
MOUNTING THE ENCLOSURE 22
MOUNTING THE DISPLAY MODULE 23
HEATING SYSTEM SENSOR (HSS) INSTALLATION 24
HEATING SYSTEM SENSOR HSS— 24
HYDRONIC HEATING
HEATING SYSTEM SENSOR HSS— 24
STEAM HEATING
OUTDOOR SENSOR INSTALLATION 25

TABLE OF CONTENTS
12 WIRING 26
POWER INPUT WIRING 26
WIRING AUX INPUT TERMINALS 26
(TERMINALS 20, 21 AND 22, 23 AND 24, 25)
POWER OUTPUT WIRING 27
WIRING THE DOMESTIC HOT WATER CALL DHW 27
(HOT WATER SYSTEMS ONLY) (TERMINALS 26, 27)
WIRING THE SYSTEM PUMP (OUTPUT) 28
(TERMINALS 4, 5)
WIRING THE BOILER OUTPUT 29
(TERMINALS 6, 7)
WIRING THE MOTORIZED VALVE OUTPUT— 29
FLOATING (TERMINALS 8, 9, 10)
WIRING THE MODEM OUTPUT 29
(TERMINALS 11, 12)
WIRING TO MODULATING OUTPUT 30
(TERMINALS 13, 14, 15)
WIRING A 4–20MA MODULATING 30
BURNER/ACTUATOR (TERMINALS 13, 14)
WIRING THE VOLTAGE MODULATING 30
BURNER/ACTUATOR (TERMINALS 13, 15)
COMMUNICATIONS WIRING (ETHERNET) 30
INTERNET (RINET) COMMUNICATIONS WIRING 30
MSI COMPONENT WIRING 31
4–20MA SENSOR INTERFACE WIRING 31
(TERMINALS 28, 29)
13 POWERING-ON 32
AUTO/BYPASS SWITCH 32
COMPLETING THE INSTALLATION 32
14 DISPLAY AND PROGRAMMING 33
GENESIS HEAT-TIMER®CONTROL STATUS LEDS 33
DISPLAY AND VARIABLE—FUNCTION BUTTONS 33
STEAM APPLICATIONS 33
HOT WATER APPLICATIONS 33
SPACE SENSOR TEMPERATURES 34
AUX INPUTS 34
SETTING THE DISPLAY CONTRAST 35
RESETTING TO FACTORY DEFAULT 35
DISPLAY MESSAGES—STEAM 36
DISPLAY MESSAGES—HOT WATER 37
INITIAL PROGRAMMING OF THE 38
GENESIS HEAT-TIMER®
SYSTEM STARTUP MENU 39
SELECTING: STEAM 39
SELECTING: HOT WATER 40
SELECTING: BASIC HEAT SETTINGS >SCHEDULES 41
SELECTING: SETTINGS 42
SELECTING:
ADVANCED HEAT SETTINGS— 43
HOT WATER
SELECTING: ADVANCED HEAT SETTINGS—STEAM 43
SELECTING: SETTINGS >MAINTENANCE 44
SELECTING:
MAINTENANCE > SYSTEM SETTINGS 45
> BOILER SETTINGS
15 SYSTEM STARTUP MENU 46
SYSTEM STARTUP 46
SET PRESENT DATE AND TIME 46
16 STARTUP MENU—STEAM 47
HEATING SYSTEM MENU 47
HEATING SYSTEM—STEAM 47
DISTRICT STEAM DELAY 48
17 STARTUP MENU—HOT WATER 49
HEATING SYSTEM MENU 49
HEATING SYSTEM—HOT WATER 49
MODULATING TYPE 49
MINIMUM WATER TEMPERATURE 50
MAXIMUM WATER TEMPERATURE 50
DOMESTIC HOT WATER 50
DHW TEMP SETPOINT 51
SET WAKE TIME 51
SET WAKE TEMP 51
SET SLEEP TIME 51
SET SLEEP TEMP 51
O/D START (WAKE) 52
O/D START (SLEEP) 52

TABLE OF CONTENTS
18 SETTINGS—BASIC HEAT MENU 53
BASIC HEAT MENU 53
SEASON 53
O/D START (WAKE) 53
O/D START (SLEEP) 53
HEAT ADJUSTMENT—STEAM 54
TABLE 1A: STEAM CYCLE LENGTH TABLE 55
HEAT ADJUSTMENT—HOT WATER 56
SCHEDULES/SPACE TGT 57
VIEW/CHANGE SCHEDULE 57
VIEW/CHANGE DATE/TIME 57
SCHEDULE EXAMPLE 58
AUTO DLS 59
19 SETTINGS—ADVANCED HEAT MENU 60
ADVANCED HEAT SETTINGS—HOT WATER 60
SLEEP SETBACK 60
SYSTEM OFFSET 60
MAXIMUM WATER TEMPERATURE 61
MINIMUM WATER TEMPERATURE 61
PUMP RUN-ON 61
ADVANCED HEAT SETTINGS—STEAM 62
SYSTEM SETPOINT 62
THERMAL LOCKOUT 63
SYSTEM RUN-ON 63
20 SETTINGS—COMMUNICATIONS MENU 64
COMMUNICATIONS 64
INTERNET PORT 64
NETWORK INFO 64
21 SETTINGS—MAINTENANCE MENU 65
MAINTENANCE 65
OUTDOOR SENSOR TRIM 65
SYSTEM SENSOR TRIM 65
PASSWORD 65
MAINTENANCE—SYSTEM SETTINGS MENU 66
SENSOR FAULT 66
MEASUREMENT UNITS 66
MANUAL OP (OPERATION) 66
MAINTENANCE—WIRELESS SENSORS MENU 67
ADD WIRELESS SENSORS 67
CHANGE WIRELESS ID 67
MAINTENANCE—BOILER SETTINGS MENU 68
MODE 68
IGNITION START 68
SOFT-OFF DELAY 68
22 SETTINGS—INFO MENU 69
INFO 69
GENERAL INFO 69
CONFIGURED SENSORS 69
23 CONFIGURING THE WIRELESS 70
SPACE SENSOR
24 TROUBLESHOOTING 71
25 PIPING DIAGRAMS 72
26 NOTES 73
27 WARRANTY 74

6|HEAT-TIMER CORP. 059705–00 REV. B
01 DETAILED OPERATION
OVERVIEW
The Genesis Heat-Timer®control is design to operate a single boiler or valve in either a steam or hydronic heating application.
The Genesis Heat-Timer®control can provide outdoor reset where the heating output is automatically adjusted based on the outdoor
air temperature and the space temperature feedback.
The unique control of the Genesis Heat-Timer®allows the installer the flexibility to choose between steam or hydronic heating, each
with the ability to provide outdoor reset with space temperature feedback. The control also flexibility to control an ON/OFF boiler or
a modulating boiler (hydronic only) with a current voltage output. If the application is a valve, either a 2-way control valve in a steam
heating application or a 3-way mixing valve in a hydronic heating application, the Genesis Heat-Timer®will provide either a floating
output signal or a current voltage modulation signal to the valve actuator.
The Genesis Heat-Timer®control is supplied with 3 space temperature sensors that are wireless and provide feedback to the
controller on the current interior building temperature. This space temperature feedback is used to automatically adjust the
outdoor reset setting of the controller. Combining the benefits of outdoor reset with the space temperature feedback
the Genesis Heat-Timer® could potentially provide up to 30% in fuel efficiency while maintaining tenant comfort.
The Genesis Heat-Timer®control can be remotely accessed through the Internet using Heat Timer’s web based program ICMS—
Internet Control Management System. Access to ICMS requires an active account with BuildingNet®and an annual access fee. This
access fee provides the account owner unlimited user access, which users can be given Full or Read Only rights of remote access to
the Genesis Heat-Timer®control.
ICMS also provides additional benefits and features other than remote access to the Genesis Heat-Timer®control. The account user
can create various alarm notifications via email and/or text, create and send various data reports based on the history of sensor data
and gather fuel and preventative maintenance information.
APPLICATIONS
RADIANT HEATING
The Genesis Heat-Timer®can control a 3-way mixing valve to regulate the temperature of the water entering the radiant tubing.
STEAM TO WATER HEAT-EXCHANGERS
The Genesis Heat-Timer®can control a 2-way steam valve to regulate the temperature of the heating water at a precise temperature.
BURNER CONTROL
The Genesis Heat-Timer®can control a burner on a steam or hot water boiler with either an ON/OFF enable signal or Current
Voltage Modulation signal (hydronic boiler only).
DISTRICT STEAM
The Genesis Heat-Timer®can control a 2-way control valve to regulate the volume of steam for precise heating.
STEAM HEATING
Whether the Genesis Heat-Timer®is controlling a boiler or a 2-way valve, the Genesis Heat-Timer®can be applied to any of the
following heating applications:
• One pipe steam—motorized valve or direct burner operation.
• Two pipe steam—motorized valve or direct burner operation.

059705–00 REV. B HEAT-TIMER CORP. |7
02 HYDRONIC HEATING
UNDERSTANDING OPERATION CONCEPT
The Genesis Heat-Timer®operating mode for hydronic systems will change the System
Set Point based on outdoor temperature (Outdoor Reset) as this is the most efficient
method of heating a building. The Genesis Heat-Timer®DOES NOT operate as a
Setpoint controller.
In Outdoor Reset, the Genesis Heat-Timer®controls a hot water heating system
(boiler or 3-way mixing valve) to provide a building with comfortable/even heat levels.
The Genesis Heat-Timer®varies the temperature of the circulating heating water
in response to changes in the outdoor temperature and on the space temperature
feedback from building sensors.
The Genesis Heat-Timer®also controls the system circulating pump with an adjustable
Outdoor start. When the outdoor temperature is above Outdoor start, the pump is off
and no heating water is circulated through the system. When the outdoor temperature
drops below the Outdoor start, the system pump relay is activated and the heating
water circulates through the system. The temperature of the heating water is controlled
by the Reset Ratio, Water Offset, changes with Outdoor temperature and feedback
from building space sensors.
Water Temperature
70 60 50 40 Outdoor Temperature130120110100
Water Temperature
70 60 50 40 Outdoor Temperature1101009080
Water Temperature
70 60 50 40 Outdoor Temperature1501401301201:4With a 0° Offset,the Reset curves begin at 100°Water Temperature.With a -20° Offset, the Reset curves begin at 80° Water Temperature.With a +20° Offset, the Reset curves begin at 120° Water Temperature.1:41:41:11:11:14:14:14:190100+20 Offset-20 Offset
Outdoor Temperature
Water Temperature
70 405060
130
120
110
100
1:4 1:1
4:1
Colder
Warmer
70 60 50 40 30 20 10 0 -10 -20100120110130140150160180170190200210220
1:31:21:1.51:1.251:11.25:11.5:12:13:14:1
Water Temperature (in °F)
Outdoor Temperature (in °F)
Reset Ratio is Presented asOutdoor Temp. : Water Temp. Ratio
Reset Ratio Curves
1:4

8|HEAT-TIMER CORP. 059705–00 REV. B
02 HYDRONIC HEATING
RESET RATIO/OUTDOOR RESET
When a building is being heated, heat escapes through the walls, doors, and windows
to the colder outside air. The colder the outside temperature, the more heat escapes.
If you can input heat into the building at the same rate that it is lost out of the building,
then the building temperature will remain constant. The Reset Ratio is an adjustment
that lets you achieve this equilibrium between heat input and heat loss.
The starting point for most systems is the 1.00 (OD) : 1.00 (SYS) (Outdoor Temperature:
Heating Water Temperature) ratio. This means that for every degree the outdoor
temperature drops, the temperature of the heating water will increase one degree.
The starting point of the curve is adjustable, but comes factory selected at 70°F
Outdoor Temp. and 100°F Water Temp. For example with a 1.00 (OD) : 1.00 (SYS) ratio,
if the outdoor temperature is 50°F, this means the outdoor temperature has fallen 20°
from the starting point of 70°F. Therefore, the system water temperature will increase
20° to 120°F.
Each building has different heat loss characteristics. A very well insulated building
will not lose much heat to the outside air, and may need a Reset Ratio of
2.00 (OD) : 1.00 (SYS) (Outdoor:Water). This means the outdoor temperature
would have to drop 2 degrees to increase the system water temperature 1 degree.
On the other hand, a poorly insulated building with insufficient radiation may need
a Reset Ratio of 1.00 (OD) : 2.00 (SYS). This means that for each degree the outdoor
temperature drops the system water temperature will increase 2 degrees.
The Genesis Heat-Timer®has a full range of Reset Ratios to match any buildings
heat loss characteristics.
A heating curve that relies not only on Outdoor temperature but also on type of
radiation will improve heat comfort. The following are suggested initial settings for
different types of radiation based on average building insulation and heat loss. The
contractor can fine tune these adjustments based on the specific building need.
TYPE OF RADIATION IN BUILDING RESET RATIO OFFSET
Radiators (Steel & Cast Iron) 1.00 (OD) : 1.00 (SYS) 0˚F
Baseboard (Finned copper tube& Cast Iron) 1.00 (OD) : 1.00 (SYS) 0˚F
Radiant (High Mass/Concrete) 4.00 (OD) : 1.00 (SYS) –10˚F
Radiant (Low Mass/Joists) 2.00 (OD) : 1.00 (SYS) –10˚F
Fan Coils & Air Handlers 1.00 (OD) : 1.00 (SYS) 20˚F
WARNING
When controlling a non condensing
boiler directly without the use
of a mixing valve, minimum
boiler water temperature must
be set to boiler manufacturer
specifications. In that case,
system temperature must not go
below such temperature.
Water Temperature
70 60 50 40 Outdoor Temperature130120110100
Water Temperature
70 60 50 40 Outdoor Temperature1101009080
Water Temperature
70 60 50 40 Outdoor Temperature1501401301201:4With a 0° Offset,the Reset curves begin at 100°Water Temperature.With a -20° Offset, the Reset curves begin at 80° Water Temperature.With a +20° Offset, the Reset curves begin at 120° Water Temperature.1:41:41:11:11:14:14:14:190100+20 Offset-20 Offset
Outdoor Temperature
Water Temperature
70 405060
130
120
110
100
1:4 1:1
4:1
Colder
Warmer
70 60 50 40 30 20 10 0 -10 -20100120110130140150160180170190200210220
1:31:21:1.51:1.251:11.25:11.5:12:13:14:1
Water Temperature (in °F)
Outdoor Temperature (in °F)
Reset Ratio is Presented asOutdoor Temp. : Water Temp. Ratio
Reset Ratio Curves
1:4

059705–00 REV. B HEAT-TIMER CORP. |9
02 HYDRONIC HEATING
HYDRONIC HEATING FEATURES
SYSTEM TEMPERATURE OFFSET
The Offset value moves the starting point of the Reset Ratio curves. Therefore, any change made to the Offset will immediately
change the value of the Calculated system water temperature by the same amount. For example, if the Calculated system water
temperature were 150°F based on the specific outdoor temperature and Reset Ratio, then increasing the Offset from 0°F to 10°F
would increase the Calculated system water temperature to 160°F.
In a new installation, start with a Offset value of 0°. Adjust the Offset value in mild weather. If the ambient building temperature is
too warm in the warm weather, decrease the Offset. If the ambient building temperature is too cold in the mild weather, increase
the Offset. The rule of thumb for baseboard radiation is to change the Offset by 4°F for every 1°F degree you wish to change the
building temperatures. For radiant heat applications, change the Offset by 1° or 2° for every degree you wish to change the building
temperature. The Offset can be set from –40 to 40°F.
NIGHT (SLEEP) SETBACK
Whenever the Outdoor temperature (OD) falls below the Outdoor start (CUT), the system pump is activated and the Genesis
Heat-Timer®regulates the heating system to hold the Target Water temperature (TGT). As the Outdoor temperature (OD) changes,
the Genesis Heat-Timer®adjusts the actual water temperature (SYS) to hold a constant or Day (NORMAL) heat level. The Day heat
level is for when occupants are present and active.
The Genesis Heat-Timer®can also hold a lower or Night (SLEEP) setback heat level. This lower level of heat is for when the building
is unoccupied, or tenants are sleeping. The Genesis Heat-Timer®has the capability of programming (2) Day (WAKE/RETURN) and
(2) Night (AWAY/SLEEP) times for each day of the week. When the building comes out of Night (SLEEP) setting, there is an factory
default optional Boost setting to quickly bring the building up to comfortable temperatures.
BOOST AND EARLY SHUTDOWN
The Boost is designed to return the building to its Day (WAKE) heat level after Night (SLEEP) heat level. It does it by increasing the
temperature of the Calculated Water Temperature (TGT) by a set amount of degrees set by the Boost Adjustment for a period of
time that is based on outside temperature.
Early Shutdown is a feature that allows a building, usually commercial, to start Night Setback earlier than the last Night (SLEEP) schedule
setting for that day. The Genesis Heat-Timer®calculates the time period from the last Night (SLEEP) schedule setting for that day based
on Outdoor temperature (OD). The warmer it is outside the earlier the Genesis Heat-Timer®will shift to Night (SLEEP).
At 65°F Outdoor Temperature (OD) the Early Shutdown is the longest of 90 minutes. At 0°F Outdoor Temperature (OD) there is no
Early Shutdown or Early Shutdown is 0 minutes.
SYSTEM PUMP RUN-ON
This allows the Genesis Heat-Timer®to run the System Pump for a longer period of time after the boiler has been turned off. Consequently,
dissipating the excess heat from the boiler combustion chamber. That way the boiler should not over heat and activate its high limit.
SCHEDULES
• By setting an operating Schedule and Night Setback, you can save energy while providing comfortable heat to the building.
The setting allows the Genesis Heat-Timer®to reduce Target temperature (TGT) by a specific number of degrees set by the
Sleep Setback during the night (SLEEP) or when building is unoccupied (AWAY), i.e. office buildings and schools.
• During the day, Day Time (WAKE and RETURN) settings will change Target temperature (TGT) based on Outdoor temperature
(OD), Water Offset, Reset Ratio. A Night Time setting will reduce the Target temperature by the Night Setback number of
degrees. Each week day can has (2) Day (WAKE/RETURN) and (2) Night (AWAY/SLEEP) settings. Each schedule period can have
an individual desired building temperature setting.
NOTE
The BOOST and EARLY SHUTDOWN features are only accessible online through ICMS (Internet Control Management System).

10 |HEAT-TIMER CORP. 059705–00 REV. B
UNDERSTANDING OPERATION CONCEPT
The Genesis Heat-Timer®is a microprocessor-based control designed to manage a low-pressure steam heating system. The control
can operate a steam boiler or a two-way steam valve using a “cycle” concept to provide the desired amount of heat to the building.
THE “CYCLE” CONCEPT
The “cycle” concept was created by Heat-Timer specifically to allow steam heating systems to overcome the inabilities of standard
thermostatic controls to cope with the unique challenges of low-pressure steam heating. Unlike water and air systems, steam systems
take time to build up a “head of steam”. Moreover, after the system starts heating up, it has momentum that takes time to dissipate.
This makes it difficult to control its temperature.
CYCLE LENGTH BASED ON OUTDOOR TEMPERATURE
By monitoring the outdoor temperature, the Genesis Heat-Timer®is able to anticipate the building heating needs. Each cycle period
(usually 60 minutes long, but adjustable depending on the type of radiation units) consists of a Cycle-ON segment and a Cycle-OFF
segment. The length of the Cycle-ON segment will vary with the outdoor temperature. The colder it is outdoor, the longer the
Cycle-ON segment.
The Genesis Heat-Timer®constantly checks the outdoor temperature by means of an outdoor sensor located on the exterior
of the building. At the same time, it monitors the heating system of the building by means of a heating system sensor. This
heating system sensor tells the control when steam has reached the furthest location in the building (or the hardest to heat area,
(see “Piping Diagrams” on page 72). Based on this combined data, the Genesis Heat-Timer®calculates the length of the ON cycle
and begins the steam cycle.
The Genesis Heat-Timer®also provides two adjustable outdoor temperature cutoff settings, one for daytime operation and one for
nighttime operation. When the outdoor temperature rises above one of the cutoff settings, the Genesis Heat-Timer®will not call for
any heat.
FIGURE 1
EXAMPLE 60 MINUTE CYCLE
Cycle-On
21 Minutes
Establish
Heat
Establish
Heat
Cycle-On
21 Minutes
Cycle-Off
39 Minutes
Cycle delayed until System
Temperature drops belows
System Set Point-Diff
15 2
60 Minute Cycle
(Cycle-ON = 21mins + Cycle-OFF = 39 mins)
34
03 STEAM HEATING

059705–00 REV. B HEAT-TIMER CORP. |11
When the outdoor temperature drops below the cutoff, the Genesis Heat-Timer®will automatically begin controlling the heating
cycle. After the heating system is active, the heating system sensor will register when heat has reached throughout the building.
The combined effect of the outdoor and heating sensors is to provide an even, comfortable level of heat throughout the building.
CYCLE LENGTH
The duration of the Cycle-ON period (when the heat source is activated) depends on four factors:
• Outdoor temperature
• Outdoor start temperature
• Heat Adjustment setting
• Cycle length
When the outdoor temperature is above the Outdoor start, the Genesis Heat-Timer®will not call for heat. When the outdoor
temperature is below the Outdoor start, the length of the Cycle-ON segment is adjusted by the Day and Night Heat Adjustment
settings. “1” is the shortest heat duration, “16” is the longest duration.
FIGURE 2
EXAMPLE CYCLES BASED ON WEATHER CONDITIONS
Establish Heat
Establish Heat
Cycle-On
8 Minutes
Cycle-On
21 Minutes
Cycle-Off
52 Minutes
Cycle-Off
39 Minutes
SAMPLE MILD WEATHER CYCLE
SAMPLE COLD WEATHER CYCLE
Cycle Length 60 Minutes
03 STEAM HEATING

12 |HEAT-TIMER CORP. 059705–00 REV. B
03 STEAM HEATING
EXAMPLE
To determine the ON cycle length, use the example values below:
• Outdoor temperature = 30°F
• Outdoor start = 55°F
• Heat Adjustment = 7
1 Subtract the outdoor temperature from the Outdoor start (55–30 = 25°F).
2 Refer to Table 1 where the Heat Adjustment row ”7” intersects with the 25°F column. The Cycle-ON time is 14 minutes
(for a 60 minute cycle).
TABLE 1: CYCLE LENGTH TABLE
*Heat Adjustment Setting—See ”Heat Adjustment—Hot Water” on page 56.
NOTE
For different cycle lengths based on the conditions of the above example, refer to the table below:
CYCLE LENGTH DIVIDE BY CYCLE-ON
20 3 5
30 2 7
90 2/3 21
OUTDOOR START MINUS OUTDOOR TEMPERATURE (ALL TEMPERATURES IN °F)
* 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 1
145 41 37 33 29 25 22 18 15 13 10 8 5 3 2 0 0 0 0 0
257 51 46 41 37 33 28 25 21 18 15 12 9 7 5 3 1 0 0 0
3C 59 54 48 43 38 33 29 25 21 18 15 12 9 7 5 3 1 0 0
4C C C 55 49 43 38 34 29 25 21 17 14 11 9 6 4 2 1 0
5C C C C 55 49 43 38 33 28 24 20 17 13 10 8 6 4 2 1
6C C C C C 55 49 43 37 32 27 23 19 15 12 9 7 5 3 2
7C C C C C C 54 48 42 36 31 26 22 18 14 11 8 6 4 3
8C C C C C C C 53 47 40 35 29 25 20 16 13 10 7 5 4
9C C C C C C C 59 52 45 39 33 27 23 18 15 11 9 6 5
10 C C C C C C C C 58 50 43 37 31 25 21 16 13 10 7 6
11 C C C C C C C C C 56 48 41 34 28 23 19 15 11 8 7
12 C C C C C C C C C C 53 45 38 32 26 21 16 13 9 7
13 C C C C C C C C C C 59 51 43 35 29 23 18 14 11 8
14 C C C C C C C C C C C 56 47 39 32 26 20 16 12 9
15 C C C C C C C C C C C C 53 44 36 29 23 17 13 10
16 C C C C C C C C C C C C 59 49 40 32 25 19 15 12
MINUTES ON (BASED ON 60 MINUTE CYCLE LENGTH)
C= CONTINUOUS OPERATION

059705–00 REV. B HEAT-TIMER CORP. |13
03 STEAM HEATING
SEQUENCE OF BURNER/VALVE OPERATION
• The Genesis Heat-Timer®will turn on the boiler or open the steam valve when the outside temperature falls below the outdoor
sensor cutoff (factory set at 55°F for Day and 55°F for Night, but fully adjustable).
• The Genesis Heat-Timer®will continue to call for heat, keeping the steam source active, until the heating system sensor reaches
its adjustable Set Point. This indicates that steam has gotten entirely through the system, or that "heat is established".
• Once "heat is established", the Cycle-ON segment of the cycle will begin.
• During the Cycle-ON period, the Genesis Heat-Timer®will keep the steam source activated. The length of the ON part of the
cycle is dependent on the outdoor temperature and the Day/Night setting.
• Once the Cycle-ON part has ended, the Cycle-OFF part of the cycle will begin. The Genesis Heat-Timer®will turn off the boiler or
close the steam valve for the remainder of this cycle.
• When the Cycle-OFF part is over, the Genesis Heat-Timer®will once again activate the steam source unless either the outside
temperature has risen above the cutoff, or the thermal lockout is active, or Space Lockout is active.
• With the thermal lockout, the heating system sensor temperature must fall below the Set Point through an adjustable differential
before the heating source can be reactivated. This allows residual heat in the pipes to continue to heat the building. Once the
pipes have cooled sufficiently, a new cycle can begin.
• The Genesis Heat-Timer®control checks for Space Lockout and adjusts the heat setting as needed before staring another cycle.
SEQUENCE OF DISTRICT STEAM OPERATION
• The Genesis Heat-Timer®will open the steam valve when the outside temperature falls below the outdoor sensor cutoff (factory
set at 55°F for Day and 55°F for Night, but fully adjustable).
• The Genesis Heat-Timer®will continue to call for heat, keeping the steam source active, until the District Steam Delay period has
timed out. This District Steam Delay period should be long enough to ensure steam has gotten entirely through the system, or
that "heat is established".
• Once "heat is established", the Cycle-ON segment of the cycle will begin.
• During the Cycle-ON period, the Genesis Heat-Timer®will keep the steam valve open The length of the ON part of the cycle is
dependent on the outdoor temperature and the Day/Night setting.
• Once the Cycle-ON part has ended, the Cycle-OFF part of the cycle will begin. The Genesis Heat-Timer®will close the steam
valve for the remainder of this cycle.
• When the Cycle-OFF part is over, the Genesis Heat-Timer®will once again open the steam valve unless either the outside
temperature has risen above the cutoff, or Space Lockout is active.
• The Genesis Heat-Timer®control checks for Space Lockout and adjusts the heat setting as needed before staring another cycle.
NOTE
The Thermal Lockout feature is not available when using the District Steam heating mode.

14 |HEAT-TIMER CORP. 059705–00 REV. B
STEAM HEATING FEATURES
STEAM OUTDOOR RESET
• The Genesis Heat-Timer®regulates the amount of steam sent to the building based on the outdoor temperature. It uses the Cycle
concept based on the Day and Night Heat Adjustment and Outdoor start to regulate the heat. The colder it gets, the longer the
Cycle-On runs.
NIGHT (SLEEP) SETBACK
• Whenever the outdoor temperature falls below the Outdoor start, the Genesis Heat-Timer®adjusts the Cycle-ON and
Cycle-OFF ratio to hold a constant Day or Night heat level. The Night heat level is for when the building is unoccupied or
tenants are sleeping.
DAY AND NIGHT SCHEDULES
• The Genesis Heat-Timer®has 2 Day (WAKE AND RETURN) and 2 Night (AWAY AND SLEEP) Schedule Period settings for each
day of the week. By setting a Schedule, Day and Night Heat Adjustments, and Outdoor start, you can save energy while providing
comfortable heat to the building. The Night (AWAY/SLEEP) settings allow the Genesis Heat-Timer®to reduce the length of the
steam Cycle-ON portion during the night or when building is unoccupied. Each schedule period can have an individual desired
building temperature setting.
SYSTEM OUTPUT
• The system output relay connects to and operates a combustion air-damper or other boiler room equipment and it will energize
whenever there is a call for the boiler.
BOOST AND EARLY SHUTDOWN
• The Boost is designed to return the building to its Day (WAKE) heat level after Night (SLEEP) heat level. It does it by running the
burner or valve output for a period of time that depends on the outside temperature.
• The Early Shutdown is a feature that shifts the Day schedule to Night Setback before the last Night (SLEEP) setting for that day.
The Early Shutdown varies based on Outdoor temperature (OD). The warmer the Outdoor temperature the earlier the
Genesis Heat-Timer®Heat-Timer®shifts to Night Setback.
03 STEAM HEATING
NOTE
The BOOST and EARLY SHUTDOWN features are only accessible online through ICMS (Internet Control
Management System).

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04 SPACE FEEDBACK
UNDERSTANDING OPERATION CONCEPT
The Genesis Heat-Timer®is design to accept space temperature feedback from the 3 space sensors included with the controller.
These sensors are preprogrammed to specifically communicate to the Genesis Heat-Timer®control. Additional sensors may be
programmed to the Genesis Heat-Timer®control and provide additional space temperature feedback.
Using the web based program ICMS—Internet Control Management System, the user is able to designated a desirable/adjustable
building temperature setting similar to the thermostat setting found in residential heating applications. The data retrieved from the
space sensors is then averaged and transmitted to the Genesis Heat-Timer®control. The Genesis Heat-Timer®control then uses
this data to determine what, if any, changes are required to the outdoor reset setting currently being used. This space temperature
feedback is available for both steam and hydronic heating.
SPACE TEMPERATURE FEEDBACK—HYDRONIC HEATING
In hydronic heating applications, the addition of space temperature feedback is more straightforward to understand. The space
temperature feedback has 2 functions depending on the average space temperature and its relationship to the desired
building temperature.
If the average space temperature exceeds the building target temperature, the Genesis Heat-Timer®control will shutdown the boiler
or in a 3-way mixing valve application, close the valve. This will continue until the average space temperature falls below the building
target temperature. The Genesis Heat-Timer®program will then adjust the reset ratio accordingly so that the adjusted system
temperature is lower when the boiler or valve is returned to heating function.
If the average space temperature is below the building target temperature, the Genesis Heat-Timer®program will recognize this and
automatically adjust the outdoor reset ratio to increase the system water temperature.
This self learning logic of the Genesis Heat-Timer®allows the installer to select a random ratio setting and allow the program logic to
adjust accordingly without worrying about the tenant comfortable level being compromised.
SPACE TEMPERATURE FEEDBACK—STEAM HEATING
In addition to the various stages of the Steam Cycle as detailed in the previous section, the Space Temperature Feedback adds
another layer to the OFF portion of the cycle. At the end of the OFF cycle the Genesis Heat-Timer®control looks at the Heating
System sensor to see if the system temperature has dropped below the System Set point minus the adjustable differential before it
begins a new heating cycle. This period is referred to as Thermal Lockout. With Space Sensor feedback, the Genesis Heat-Timer®
control also looks at the desired building temperature setting and compares that setting with the current average space temperature.
If the average measured space temperature is above the target building temperature, the Genesis Heat-Timer®control will delay
starting a new heating cycle. This will occur even if the system sensor temperature has fallen below the differential setting that would
normally start a new heating cycle. This period is referred to as Space Lockout.
Through the logic of the Genesis Heat-Timer®program, depending on whether the average building temperature is above or
below the desired building target temperature, the heating setting will automatically adjust accordingly. This self-learning concept
of the Genesis Heat-Timer®ensures the heating of the building matches the changing outdoor temperatures and the heat loss of
the building.

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05 INPUTS
HEATING SYSTEM SENSOR
The Genesis Heat-Timer®is designed to connect to the provided Heat-Timer heating system sensor (P/N 904220–00).
In a steam heating application the heating system sensor is located where it will show that heat has reached the furthest location in
the building either on the condensate return going back to the boiler or on the furthest radiator. The Genesis Heat-Timer®uses the
temperature information from the heating system sensor combined with the outdoor temperature sensor to control the heat level in
the building.
In a hydronic heating application the heating system sensor is located on the main supply header at least 10 feet (if applicable) from
the boiler and before any take-offs. The Genesis Heat-Timer®uses the temperature information from the heating system sensor
combined with the outdoor temperature sensor to control the heat level in the building.
OUTDOOR TEMPERATURE SENSOR
The Genesis Heat-Timer®is designed to connect to the provided Heat-Timer temperature sensor (P/N 904220–00).
The outdoor temperature sensor is located on the exterior of the building. The Genesis Heat-Timer®uses the temperature
information from the outdoor temperature sensor combined with the system temperature sensor to control the heat level in
the building.
AUX 1, AUX 2 AND AUX 3
The Genesis Heat-Timer®is designed to accept either a temperature sensor (P/N 904220–00) or a wired space sensor
(P/N 904001–00) or a switch closure as an auxiliary input signal. The type of signal must configured through the ICMS program
and can only be monitored through the ICMS program.
DHW CALL
The Genesis Heat-Timer®is designed to accept a switch closure for enabling the domestic hot water function when doing hydronic
heating only. The DHW Call enable signal must be initiated from an external control or device and the enable signal must be a
dry contact.
MAKE SURE YOU HAVE THE RIGHT CONTROL
If you need the Genesis Heat-Timer®to do additional tasks that are either not listed or you do not know how to configure
them, contact Heat-Timer Corp. Technical Support either by Phone [phone], Fax [phone], or by
E-mail [e-mail].

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06 OUTPUTS
VALVE ACTUATOR
The Genesis Heat-Timer®is designed to connect to a motorized valve actuator. Using the inputs from the outdoor temperature
sensor and the system temperature sensor, the Genesis Heat-Timer®controls the heating system by opening and closing the
motorized valve actuator. The valve can be either a 2-way valve for a steam to water exchanger application or a 3-way mixing valve
for a low temp radiant application or a 2-way valve for a district steam heating application.
For valve actuators requiring a proportional/modulating signal, the Genesis Heat-Timer®can provide a current voltage signal. In this
configuration the Genesis Heat-Timer®controls the heating system by modulating the valve from 0% to 100%.
BOILER BURNER
The Genesis Heat-Timer®is designed to connect to the boiler burner. Using the inputs from the outdoor temperature sensor and the
system temperature sensor, the Genesis Heat-Timer®controls the heating system by turning the boiler burner ON or OFF.
BURNER MODULATION
The Genesis Heat-Timer®is designed to provide the boiler burner in a hot water application, a current voltage modulation signal.
Using the inputs from the outdoor temperature sensor and the system temperature sensor, the Genesis Heat-Timer®controls the
heating system by modulating the boiler burner from 0% to 100%.
SYSTEM PUMP—HYDRONIC
The System Pump output relay will energize when the outdoor temperature drops below the Outdoor start or whenever the boiler
output is active.
SYSTEM PUMP (OUTPUT)—STEAM
The system output relay connects to and operates a combustion air-damper or other boiler room equipment and it will energize
whenever there is a call for the boiler.
MODEM
The Genesis Heat-Timer®is designed to reset the communication modem. In the event Internet communication has been lost for
more than a hour, the Genesis Heat-Timer®will reset the modem power connection by opening the relay contact.

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07 CONTROL LAYOUT
AUTO/By-Pass Switch
120VAC Power
Output Relays—System Pump, Boiler
Enable, Valve and Modem
Modulation output can be 0–5V,
0–10V, 1–5V, 2–10V or 4–20mA
MSI Network for
Internet/RINET components
Future use
Ethernet Connection for
Internet/RINET communication
The digital display shows the
system status, set point, To view
and adjust settings, press the
appropriate buttons
LED indicates the
associated relay status
Buttons function is presented
on Bottom Row of display
When connecting Outdoor and System
Sensors, no Polarity is observed

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08 SPECIFICATIONS
GENESIS HEAT-TIMER®CONTROL
Voltage Input 120VAC, 60 Hz
Maximum Input Rating 30VA
Dimensions (W x H x D) 11” x 9” x 3¾” (279.4mm x 228.6mm x 95.25mm)
Weight 2.5Lbs (1.13kg)
Output Relays System/Pump I Boiler I Valve I Modem
Output Relays Rating 120VAC, 3 Amp Resistive
1 Amp Pilot Duty
120VAC, 1 Amp Resistive (Modem)
Inputs System Temperature
Outdoor Temperature
DHW Call
(3) Optional Temp or Switch Inputs
User Interface Digital Display
Display Units: Temperature (°F and °C)
Status Indicators (3 LEDs)
Variable-Function Buttons (4)
Modulating Output Types 4–20mA, 0–5V, 0–10V, 1–5V, 2–10V

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09 SPACE SENSOR
ITEM DESCRIPTION
1Transmit Button.
Use to send the Wireless SNR data to a
destination device.
2Status Indicators (LEDs).
• Green “main” LED blinks when data
reception by a destination device has
been acknowledged.
• Red “RF” LED will blink with the
Green LED when the Wireless SNR
is not programmed.
If both LEDs are blinking, no System ID has
been configured.
ITEM DESCRIPTION
3RF Module.
Transmit/receive radio signals to/from
other devices.
4Internal Antenna.
5Batteries.
Provide power for the Wireless SNR (2)
AA 1.5V lithium batteries.
6RS485 Connector. (Future use)
SPECIFICATIONS
6
5
4
1 2 3
Power Input 2 AA (1.5V)
Transmission/Reception Built-in Antenna
Reading Space Temperature
LED 2 LED for Status Display
Programming Interface Wireless
Temperature Range 40°F to 150°F Degree
Dimensions 4–¾” x 2–5/8” x 1–¼”
Mounting Wall Mount