4
MPC Platinum Installation and Operation Manual
HT# 059085-00
F
UNDERSTANDING THE CYCLE CONCEPT
The Heat-Timer MPC Platinum is a microprocessor-based control designed to manage a low-pressure steam heating system. It
operates a steam boiler or a two-way steam valve to provide the desired amount of heat to the building.
The MPC Platinum operates based on the CYCLE principle. Heat-Timer created this principal specifically for 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, once the system starts
heating up, it has momentum that takes time to dissipate. This makes it difficult to control its temperature.
Cycle-On
21 Minutes
Cycle-Off
39 Minutes
Establish
Heat
Cycle-On
21 Minutes
Establish
Heat
Cycle delayed until
System Temperature drops
below System Set Point-Diff
1
2
3
4
1
60 Minute Cycle
(Cycle-On=21 + Cycle-Off=39)
Cycle length based on outdoor temperature
By monitoring the outside temperature, the MPC Platinum is able to anticipate the building heating needs. Each CYCLE period
(usually 60 minutes long, but adjustable depending on the type of radiation units) consist of a Cycle-ON segment and a Cycle-OFF
segment. The length of the Cycle-ON segment will vary with the outside temperature. The colder it is outside, the longer the
Cycle-ON part.
MPC
Platinum
PREV.
(DEL)
OUT
TEMP
AUX
INPUT 0
AUX
TEMP 0
AUX
TEMP 1
MENU FUNCTIONS
SELECT enters menus or accepts changes
ADJUST selects menu items or changes settings
BACK returns to previous menu
DAY selects next day
PREV./NEXT steps through output status
LI
N
E
N
E
U
TR
A
L
DAY
HELP
NEXT
PRESS TO
SELECT
BACK
MON 12/28/04 10:43Am
ADJUST
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
AUX
TEMP 2
DO NOT APPLY ANY VOLTAGE
TO SENSOR TERMINALS
A13
A14
A15
A16
A17
A18
NETWORK
MSI CONNECTION
ON BACK
PROVE
SHUTDOWN
SYSTEM
TEMP
AUTO
BYPASS
ALL SENSORS MUST BE
GOLD SERIES SENSORS
INPUTS
ROUTE SENSOR AND AUXILIARY WIRES
THROUGH THIS KNOCKOUT ONLY
SYS
AUX
CLOCK
OPTION
1
OPTION
2
T
T
T
Cycle On
Cut= 55oF Day
OD= 31oF SYS= 148oF
OUTPUT
B
BURNER
MOTORIZED
VALVE
SYSTEM
OPTION
1
OPTION
2
OPTION
3
AUX
CLOCK
T
T
C O R P O R A T I O N
R
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
OPTION
3
10
18
R
W
Outdoor
Sensor
MPC Platinum
Zone A
Boiler Water Line
Boiler
Zone B
Zone C
Condensate
Receiver
System Sensor
Installed on Dry
Return Above
Water Line
Optional Location:
System Sensor
At Furthest Radiator
Burner
The MPC Platinum constantly checks the outside temperature by means of a solid-state 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 is located where it will show that heat has reached the furthest location in the building (or the hardest to heat area). Based on
this combined data, the MPC Platinum sends instructions to the heating plant to control the heat level in the building.
In addition to adjusting the length of the Cycle-ON segment, the outdoor temperature acts as a system cutoff. When the outdoor
temperature rises above one of the adjustable cutoff temperatures (Two outdoor cutoffs are available. One is for the day and the
other is for the night), the MPC Platinum will not call for any heat. When the outdoor temperature drops below the cutoff, the
MPC Platinum will automatically begin controlling the heating cycle. Once the heating system is active, the heating system sensor
will register when heat has reached throughout the building. The combined effect of these two sensors is to provide an even,
comfortable level of heat throughout the building.
