Unity 5 3D Camera scrolling script not correctly placed

I have a C# code shown below which lets me scroll my player camera in and out with a limited distance, but for some reason spawns the camera far below the player. I am new to Unity and don't have any idea how to solve this.

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class Camera : MonoBehaviour {

 public Transform playerCam;

 private float zoom;
 public float zoomSpeed = 2;

 public float zoomMin = -2f;
 public float zoomMax = -10f;

 // Use this for initialization
 void Start () {

     zoom = -3;
     
 }
 
 // Update is called once per frame
 void Update () {

     zoom += Input.GetAxis ("Mouse ScrollWheel") * zoomSpeed;

     if (zoom > zoomMin)
         zoom = zoomMin;

     if (zoom < zoomMax)
         zoom = zoomMax;

     playerCam.transform.position = new Vector3 (0, 0, 0);

 }

}

Please Help!

Thanks, Hgsc45