PB Heat mod-u-pak Installation And Operating Instructions Manual
INSTALLATION INSTRUCTIONS
HANG THESE INSTRUCTIONS IN VICINITY OF BOILER
PEERLESS ATMOSPHERIC
GAS BOILERS
INSTALLATION
AND
OPERATING INSTRUCTIONS
MOD–U–PAK
SYSTEM
CONTROL SETS
No. 1 - PROPORTIONAL WATER TEMPERATURE CONTROL W/ SUPPLY OR RETURN
WATER TEMPERATURE SENSOR
No. 2 - PROPORTIONAL WATER TEMPERATURE CONTROL W/ OUTDOOR RESET
No. 3 - PROPORTIONAL STEAM PRESSURE CONTROL W/ STEAM PRESSURE
SENSOR
GG8027 R11 (7/07-6C)
Printed in U.S.A.
PB HEAT, LLC
NEW BERLINVILLE, PA 19545-0447
2
MOD–U–PAK CONTROL SYSTEM
WATER BOILERS
PROPORTIONAL WATER TEMPERATURE CONTROL W/OUTDOOR RESET (CONTROL SET NO. 2)
1 – DESCRIPTION
This Mod-U-Pak System is a proportional system in which boiler water temperature and boiler gas input are modulated proportionately to changes in outside temperature.
For maximum comfort the boiler-water temperature varies inversely to the change in outside temperature; that is, as the outside temperature increases or decreases, the boiler water temperature decreases or increases correspondingly.
For maximum performance the input to the boiler is varied inversely to the change in outside temperature; that is, as the heating load
requirement changes due to an increase or decrease in outside temperature the gas input to the boiler decreases or increases
respectively.
Three controls are used to accomplish the modulating sequence: an indoor-outdoor reset control, and two dual-acting temperature
controllers. The indoor-outdoor control maintains and modulates the boiler water temperature in accordance with a change in outside
temperature; that is, as the outside temperature varies, the temperature setting of the control automatically changes, thus raising or
lowering the boiler water temperature. The dual-acting temperature controllers vary the gas input to the boiler by sensing a change in
outside temperature and thus opening or closing the three main automatic operating valves. The first gas valve flow circuit incorporates an orifice which provides 50% of the maximum flow rate, the second valve flow circuit incorporates an orifice which provides
75% of the maximum flow rate, and the third valve delivers 100% of the maximum flow rate.
2 – STANDARD CONTROLS
1–Honeywell T475A Outdoor Reset Control
2–Honeywell T675A Temperature Controllers
2–Element Guards for T675A Controllers
2–Split-Plugs for T675A Controllers
1–DP-ST Bypass Disconnect Switch
NOTE: Element guard and split-plug are provided with the T475A as part of the package.
3 – CONTROL INSTALLATION
When installing the T475A Outdoor Reset Control or the T675A Temperature Controllers, follow the manufacturer’s installation instructions supplied with the appropriate control. These instructions cover the proper mounting of the control, sensing element and element
guard.
4 – WIRING
All wiring must be done in accordance with the current National Electrical Code and local codes. Refer to wiring diagrams in rear of
booklet for correct wiring of controls. Contact PB Heat, LLC for application of controls, ignition systems or codes not covered by these
wiring diagrams.
5 – TEMPERATURE CHARTS
The following charts will enable you to set the controls under various design conditions. The charts are based on outside design temperatures of 0°F, -10°F, and -20°F with an indoor temperature of 70°F. The ratio setting of the T475A outdoor reset control is recommended as 1 to 1; that is, as the outdoor temperature varies 1°F the boiler water temperature will vary 1°F. Maximum boiler water temperature is assumed to be 180°F. If other maximum boiler water temperatures are desired, start at the outdoor design temperature,
such as 0°F, and reduce the water temperature 5°F for each increment of 5°F rise in outdoor temperature.
3
a. 0°F OUTDOOR DESIGN TEMPERATURE:
BOILER
OUTDOOR INPUT WATER
TEMP. °F % TEMP. °F
70 50 110
65 50 115
60 50 120
55 50 125
50 50 130
45 50 135
40 50 140
35 75 145
30 75 150
25 75 155
20 100 160
15 100 165
10 100 170
5 100 175
0 100 180
Setting of #1 T675A Temperature Controller — 35°F
Setting of #2 T675A Temperature Controller — 20°F
Setting of T475A Outdoor Reset Control — 110°F
b. -10°F OUTDOOR DESIGN TEMPERATURE:
BOILER
OUTDOOR INPUT WATER
TEMP. °F % TEMP. °F
70 50 100
65 50 105
60 50 110
55 50 115
50 50 120
45 50 125
40 50 130
35 50 135
30 75 140
25 75 145
20 75 150
15 75 155
10 100 160
5 100 165
0 100 170
– 5 100 175
– 10 100 180
Setting of #1 T675A Temperature Controller — 30°F
Setting of #2 T675A Temperature Controller — 10°F
Setting of T475A Outdoor Reset Control — 100°F
c. -20°F OUTDOOR DESIGN TEMPERATURE:
BOILER
OUTDOOR INPUT WATER
TEMP. °F % TEMP. °F
70 50 90
65 50 95
60 50 100
55 50 105
50 50 110
45 50 115
40 50 120
35 50 125
30 50 130
25 75 135
20 75 140
15 75 145
10 75 150
5 100 155
0 100 160
– 5 100 165
– 10 100 170
– 15 100 175
– 20 100 180
Setting of #1 T675A Temperature Controller — 25°F
Setting of #2 T675A Temperature Controller — 5°F
Setting of T475A Outdoor Reset Control — 90°F
Loading...