Hoffman Controls. OEM Installation Manual. Description. Application. Field Recalibration. Features. 744-H, C, HP, CP Series Step Controllers NOTE

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1 offman ontrols OEM Installation Manual 7-,, P, P Series Step ontrollers Description The 7-,, P, P, Series Step ontrollers are first on / last off electronic step controllers. The ontrollers are available in,, or stages, with S.P.S.T. (Form A) isolated pilot duty relays. Three ontrollers may be utilized to provide up to eighteen consecutive stages. The ontroller is available in two series. The 7- or 7- Series features the capability of accepting four input signals; two thermostat ranges (inputs), 135 ohms and 1 to olts D or 1 to ma. The 7-P or 7-P Series has an on-board pneumatic transducer that directly accepts to 15 psi pneumatic input signals. The ontrol incorporates one (. 1 olts D) internal (eating or ooling) ramp that spans the input signal ranges. All stages must be located on either the heating or cooling ramp. This feature eliminates the requirement for a separate span adjustment for the ramp. The user has the ability to locate and set any stage within the input signals range on the internal ramp. All ontroller stages are (Form A) isolated output relays with a single ommon terminal. Application All 7 Series Step ontrollers are furnished factory programmed and calibrated. Each Series offers models with,, or steps of staging. Factory Standard alibration Table 1 Input Input Signal at Offset From Signal Set Point Set Point & Range eat ool Between Stages 5 5 F F Selected F Selected.7 F 3 F F Selected F Selected. F 135 Ohms Ohms 13 Ohms. Ohms 1 D 1 olt olts 1. D 1 ma 1 ma ma 1. ma 15 psi 9. psi 7. psi.5 psi Fixed Differential Stage Settings Table Signal Input Range Factory Standard F 5 5. F 3 1. Ohms 135 Ohms 5. Ohms olts D 1 D.7 ma 1 ma.7 ma psi 15 psi.5 psi Differential (ysteresis) signal change from turn on to turn off. Features Five electric/ electronic inputs (7- or 7-), or One pneumatic input (7-P or 7-P). All stages are programmed for either eating (reverse acting) or ooling (direct acting). All signal input setpoints are factory calibrated. The differential is fixed for each stage. Factory calibration standards are noted in Table 1. The 7-,, P, P alibration urves depict the energizing location of each stage (up to stages) for its specific input signal or internal Ramp oltage. To use the factory standard calibration and programming, the installer must provide A power and use the factory calibrated input signal range for the application. The input signal selected must conform to the precalibrated span as shown in the 7 Series alibration urves. Field Recalibration If the factory standard calibration of stages is not suitable, field calibration will be required. The 7-,, P, P Step ontrollers are designed to allow the user to recalibrate the ontroller s functions as required for the application. The following information must be determined before the field calibration procedure can be accomplished. 1. What are the total number of stages required? eating ooling If more than six () stages of heating or cooling are required, see 7 Master & Slave Interconnect Wiring. Page 1 of 7-,, P & P Series OEM Installation Manual

2 . What is the required input signal value in ohms, D, ma, or psi for setpoint?. (When 9 Series thermostat / sensors are used, input signal re-zeroing is not required. 3. What is the required value in ohms, D, ma or psi for the span (from setpoint) for the stages required? eating signal span value. or ooling signal span value. Reprogramming Step #1 Re-zero Set Point Re-zero of thermistor (K) input is not necessary. If re-zero is required of the setpoint for ohms, D, ma or psi input signal, proceed as follows; otherwise omit this step and proceed to Step #. eat Re-zero A. onnect DM to and OM (oltage Ramp) test posts and supply the required input signal (setpoint) in ohms, D, ma or psi to the ontroller. B. Adjust the eat Zero pot until. D (eat Ramp olts) is observed on the DM. ool Re-zero A. Relocate DM to and OM (oltage Ramp) test posts and supply the required input signal point in ohms, D, ma or psi to the ontroller. B. Adjust the ool Zero pot until. D (ool Ramp olts) is observed on the DM. Setpoint has now been re-zeroed to the new values selected for eating and ooling setpoints. Step # Recalibrating eat Stages Proceed to Step #3 when using factory preset heating stages. If not, all stage pots must be recalibrated. A. Select appropriate Input Signal vs. Ramp olts alibration urve. B. Determine the input signal value required for each heating stage and the corresponding ramp volts. (See the 7 alibration urves.). Install the tab to the position at the 7 location. The tab should be placed in the storage position (depicted below). Storage Position 7 D. Reset all eat stage trim pots fully W. A synchronization time-delay may be observed between the illumination of an L.E.D. and closing of the associated relay. This is normal. E. Install DM on and OM (oltage Ramp) test posts. F. Adjust trim pot (R) to the eat Ramp olts, determined in.b. above, for the first stage of heat. G. Adjust Stage 1 trim pot W while observing Stage 1 L.E.D. STOP adjusting trim pot when the L.E.D. turns ON. Repeat this step as necessary to reach an accurate adjustment.. Repeat Steps A. through G. above, for each eat stage used. (Stage B, Stage, etc.) I. After calibration of heat stages, slowly adjust the trim pot (R) from full W to full W to energize and de-energize stages. IMPORTANT If the stages do not de-energize in the following order, repeat Steps A. through G. Last stage must de-energize first. The first stage must de-energize last. Each stage from the last to the first must de-energize sequentially. Step #3 Recalibrating ool Stages Proceed to Step # when using factory preset cooling stages. If not, all stage pots must be recalibrated. A. Select appropriate Input Signal vs. Ramp olts (see 7 Series alibration urves). B. Determine the required input value for each ool stage and the corresponding Ramp olts.. Install the tab to the position at the 7 location. Put the tab in the storage position (depicted below). 7 Storage Position D. Reset all ool stage trim pots fully W. Page of 7-,, P & P Series OEM Installation Manual

3 STG A STG B STG STG D STG E STG F OM INSTRUTIONS RELAY RELAY RELAY RELAY RELAY RELAY INSTRUTIONS L.E.D. Indicators Sequence Tab position when Slave(s) are not used 1 Mode Jumper Stage Setpoint Trim Pots STEPS.G. and 3.G. Pneumatic Input ( 15 psi) 7-P or P Series Only OPTION: On-Board Setpoint For 7- or 7- Only eat or ool Zero STEP 1 EAT OOL TRANSDUER OM 7 R / Program Tabs STEP Trim Pot STEPS.F and.i 3.F and 3.I When two () or more ontrollers are required LO A S R Y B TP7 R Y B OM OM Power In If A must be grounded, ground only the terminal marked "LO". When two () or more ontrollers are required Figure 1 7- or 7- Six Stages of eat or ool, Illustrated with Stages of eat A synchronization time-delay may be observed between the illumination of an L.E.D. and closing of the associated relay. This is normal. E. Install DM on and OM (oltage Ramp) test posts. F. Adjust trim pot (R) to the ool Ramp as determined in 3.b. for the first stage of cooling. G. Adjust Stage 1 setpoint trim pot W while observing Stage 1 L.E.D. STOP adjusting when L.E.D. turns ON. Repeat this step as necessary to reach an accurate adjustment.. Repeat Steps A. through G. above for each cooling stage used (stage B, stage, etc). I. After calibration of cooling stages is complete, slowly adjust trim pot (R) from full W to full W to energize and de-energize stages. IMPORTANT If the stages do not de-energize in the following order, repeat Steps A. through G. Page 3 of Last stage must de-energize first. The first stage must de-energize last. Each stage from the last to the first must sequentially de-energize. Step # / Tab Installation After calibration is complete remove the or tabs at the 7 location and install them in the position. The input signal is now in control of staging. ool Mode (eat Mode to follow.) This instruction pertains to the Master and Slave interconnection and the Slave recalibration only. If the Master requires recalibration, refer to the 7-,, P, P Series Installation and Operating Instructions. All steps must fall within the predetermined ramp voltages using the 7-,, P, P Series alibration urves. (See Sample Graph.) 1. Wire Master and Slave as shown on the Master & Slave Interconnect Wiring literature.. A Slave is only required when all six stages of the Master are utilized. Always group all cooling stages together in sequence from left to right. 7-,, P & P Series OEM Installation Manual

4 3. Master sequence tab Stage A (Step 1) should be programmed (for heating or cooling) as follows: Page of Sequence Tab. Slave sequence tab Stage A (Step 7) should be programmed as follows: Sequence Tab 5. Program the 7 tabs to position on BOT the Master and Slave (see Master & Slave Interconnect Wiring literature).. STER Stage F Turn-On a. Install Digital olt Meter, DM (+) lead to (oltage Ramp) test post and DM ( ) lead to (oltage Ramp) test post OM. b. Turn trim pot (R) fully W. c. Turn trim pot (R) slowly W while observing DM. Stop adjusting trim pot when Stage F L.E.D. turns ON. Repeat Steps B and as necessary to reach a repeatable voltage. d. Record the internal ramp voltage. A time-delay is normal between L.E.D. turn On and relay operation. 7. SLAE Stage A Turn-On a. Determine value of Ramp oltage for the Slave (Stage A). This stage will be Step 7 of the ool mode. b. Install Digital olt Meter (DM) (+) lead to (oltage Ramp) test post and DM ( ) lead to (oltage Ramp) test post OM on Slave ontroller. c. Turn the trim pot (R) fully W. d. Turn the trim pot (R) slowly W until the predetermined Ramp oltage is obtained on the DM. This voltage should be greater than the value recorded in.d. (i.e., a continuation of the Ramp oltage is determined in the alibration urves literature; see Sample Graph below.) e. Adjust the Slave Stage A trim pot W. Stop adjusting trim pot when L.E.D. turns ON. Repeat this step as necessary to obtain a repeatable voltage. This Stage is Step 7 of the sequence and should be a continuation of the ramp determined in the alibration urves literature (see Sample Graph below).. Repeat Step 7.a. through 7.e. for Stages B through F on the Slave by continuing up the voltage ramp for each step as necessary for the total number of steps being used. 9. Reprogram the 7 tabs for normal operation. Both Master and Slave 7 tabs should be in the position. If more than one Slave is used, the ramp will continue as described above. Follow instructions # through #9 for each additional Slave. Ramp oltage (Steps) Sample Graph eat Mode This instruction pertains to the Master and Slave interconnection and the Slave recalibration only. If the Master requires recalibration, refer to the 7-,, P, P Series Installation and Operating Instructions. All steps must fall within the predetermined ramp voltages using the 7-,, P, P Series alibration urves. (See Sample Graph.) 1. Wire Master and Slave as shown on the Master & Slave Interconnect Wiring literature.. A Slave is only required when all six stages of the Master are utilized. Always group all eat stages together in sequence from left to right. 3. Master sequence tab Stage A (Step 1) should be programmed as follows: Sequence Tab. Slave sequence tab Stage A (Step 7) should be programmed as follows: Master 5 Steps Sequence Tab 5. Program the 7 tabs to position on BOT the Master and Slave (see Master & Slave Interconnect Wiring literature).. STER Stage F Turn-On a. Install Digital olt Meter (DM) (+) lead to the (oltage Ramp) test post and DM ( ) lead on OM test post of oltage Ramp. b. Turn trim pot (R) fully W. c. Turn trim pot (R) slowly W. Stop adjusting trim pot when L.E.D. turns On. Repeat Steps B and as necessary to reach a repeatable voltage. 7 7-,, P & P Series OEM Installation Manual 9 Slave SP ontroller Input (ool Mode) 11 1

5 d. Record the internal ramp voltage. A time-delay is normal between L.E.D. turn On and relay operation. 7. SLAE Stage A Turn-On a. Determine value of Ramp oltage for Slave (Stage A). This stage will be Step 7 of the eat mode. b. Install Digital olt Meter (DM) (+) lead to the (oltage Ramp) test post and DM ( ) lead on OM test post of oltage Ramp on Slave ontroller. c. Turn the trim pot (R) fully W. d. Turn the trim pot (R) slowly W until the pre-determined Ramp oltage is obtained on the DM. This voltage should be greater than the value recorded in.d. above (i.e., a continuation of the Ramp oltage as determined in the alibration urves literature: see Sample Graph below). e. Adjust Slave Stage A trim pot W. Stop adjusting trim pot when L.E.D. turns ON. Repeat this step as necessary to obtain a repeatable voltage. This Stage is Step 7 of the sequence and should be a continuation of the ramp determined in the alibration urves literature. (See Sample Graph below.). Repeat Step 7.a. through 7.e. for Stages B through F on the Slave by continuing up the voltage ramp for each step as necessary for the total number of steps being used. 9. Reprogram 7 tabs for normal operation. Both the Master and Slave 7 tabs should be in the position. If more than one Slave is used, the ramp will continue as described above. Follow instructions # through #9 for each additional Slave. The 7- or 7- and 7-P or 7-P Series Step ontrollers provide an internal D olt Ramp for either heating and/ or cooling application(s). The 7- or 7- is designed to accept any one of the five electric/ electronic input signals: Two thermostat ranges, 135 ohms, 1 D or 1 ma. The 7-P or 7-P has an on-board transducer that directly accepts 15 psi pneumatic input signals. In both Series, all factory calibrated staging occurs at the same Ramp D oltage. The Ramp olts D vs. Input graph describes each input signal that is available. Stages are factory programmed and calibrated. For field recalibration of stages see Installation & Operating Instructions (pages 1 & ) and the Recalibration Instructions (pages 3 & ). 7- or 7-7-P or 7-P Ramp olts D Stage Ramp olts D 1 1 Description. Setpoint Stage Stage.5 3. Stage Stage Stage Stage Ramp oltage (Steps) Slave 7 Steps 5 3 Master SP ontroller Input (eat Mode) 1 Ramp olts D OLD OT SP SP Sample Graph Temperature, F Input Page 5 of 7-,, P & P Series OEM Installation Manual

6 Ramp olts D OLD OT SP SP Temperature, F Input Ramp olts D, ma D OLD OT OLD D & ma (Standard) 1 D & 1 ma (Optional) Input Ramp olts D OT Ohms Input OLD Page of 7-,, P & P Series OEM Installation Manual

7 Wiring Diagrams ontrol ircuit oltage (User Supplied) R1 R R3 R R5 R STG A STG B STG STG D STG E STG F ontactors (User Supplied) OM EAT OOL OM 7 R LO A S R Y B TP7 R Y B OM OM To "IN" On nd when used A Power 9-19DRW R B Remote Sensor 9-13W 9-13AW 9-13ADRW 9-13DRW 9-3AW 9-3ADRW B R 135 ohm W 1 ma 1 D D Output Power Supply If a A line must be grounded, ground only the terminal marked "LO". 7- or 7- Step ontroller, 7- ontroller Illustrated ontrol ircuit oltage (User Supplied) R1 R R3 R R5 R ontactors (User Supplied) STG A STG B STG STG D STG E STG F OM EAT OOL 15 psi Pneumatic Transducer OM 7 R LO A B TP7 To "IN" On nd when used A Power If a A line must be grounded, ground only the terminal marked "LO". 7-P or 7-P Step ontroller, 7-P ontroller Illustrated Page 7 of 7-,, P & P Series OEM Installation Manual

8 Master & Slave Interconnect Wiring 7- or 7- Master Steps 1 7- or 7- Slave Steps R 7 R EAT OOL OM EAT OOL OM LO A S R Y B TP7 R Y B + OM 1 3 LO S R Y B TP7 R Y B + OM OM OM A Power A Power If a A line must be grounded, ground only the terminal marked "LO". 7- (Master) and 7- (Slave) Illustrated 7-P or 7-P Master 7- or 7- Slave Steps 1 Steps psi Pneumatic Transducer 7 R 7 R EAT OOL OM EAT OOL OM LO A B TP7 LO S R Y B TP7 R Y B + OM OM A A If a A line must be grounded, ground only the terminal marked "LO". 7-P (Master) and 7- (Slave) Illustrated offman ontrols 3 Merrell Road, Dallas, Texas 759 Phone: (97) 3-75 Fax: (97) 7-7 Toll Free: Page of Form: 7- -, Rev. B